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Damn you again with anothr bad example. The guy on the left can generate alot more force in a static position then the guy on the right. The guy on the right is just fatbuff. the guy on the left easily reps 3 plates on the bench and is only bested by the fat guys potential momentum. Which is likely only another 125lbs if they are the same height.
Okay, you weren't kidding, this is actually a really good explanation. You really didn't mess around with any other fluff, you got to the point and explained it with brilliant visual demonstrations. Well done.
Extremely rare these days,(keeping it real) well done on the video, I'm learning a different to explain it better to customers and friends with better terminology.
As a Mechanical Engineer, I cannot believe you just explained the conceptual difference between Torque and HorsePower better than EVERY SINGLE professor I've ever had!
@@ZiegenMeisterV1 No it wouldn't, the GRS905 gearbox that Scania uses for the truck in the video already has 14 gears crammed in it with the 1st gear ratio being around 16:1 for an output torque of around 40000Nm. The Nissan engine would need a 1st gear ratio of 63:1 just to get the truck to move. A simpler explanation of the relationship between power and torque is power determines how fast you can go, torque determines how fast you can accelerate/how much mass you can pull.
@@leeowen4989 one thing that I never understood though... diesel cars tend to have way more torque than petrol cars, yet often need more time from 0-60. how come?
@@uNki23 It is usually because diesel engines can't rev as high as petrol engines and also rely heavily on a turbocharger. That said though, modern diesels are much more refined and are just as capable as petrol with much better fuel efficiency.
One important additional difference to note is, that TORQUE CAN BE CHANGED by a GEARBOX - you can trade rotational speed for torque or vice-versa. But power is conserved - no gearbox can make power out of nothing. This is essential, and why we have transmission in the first place. You could pull a truck with a Nissan engine, you would just need a low range gearbox.
@@Simon-fg8iz Thanks SIMON. That makes more sense now. I own a 2008 SCION TC with a 4cyl 2.4L and it's very torquey and they are known for that. Over the years I have driven cars with Bigger Engines most commonly the 3.4L and they didn't feel no where near my TC but now I understand the Low Range Transmission vastly improves Torque performance. Meaning 2 Cars with SAME EXACT ENGINE Size can have 2 Varying TORQUE Ratings due to the Gearing Ratio. A Corolla with 2.4L feels sluggish versus my SCION TC with the same exact Engine. Makes Sense now. Thanks again Simon
I love how this video gets straight to the point. Doesn't have a long intro or some history lesson to artificially make the video longer. It's perfect.
@@ulysses_grant an engine's pulling power is related to its horsepower, not torque, this is proven when you see a gas turbine competition tractor do a full pull, gas turbines are low torque high RPM engines.
@@thromboid I don't see it. Horse power = calculated average maximum power exerted based on observation of (wait for it...) horses. The horses were turning a mill (if memory serves), yet we don't call it "mill power". Torque is a measurement calibrated by exerting a known force at a known distance (typically by suspending a reference weight along a beam of measured length). The "brake" or "water wheel" is just a measuring tool to apply this calibration to an observation.
@@ehb403 Don't mind me - I'm just being snooty. :) I've no quibble with horsepower as a unit (other than not being SI) - what seems strange is using it to refer generically to the physical quantity, instead of simply "power" or "mechanical power". If it's referring to a particular test procedure then that specificity is useful.
I'm not an English speaker, I'm not even a car driver. I also never played with lego engines. Despite that all, I was able to get all the explanations, so that's probably a sign of a good content. p.s. I was good at physics at school, but forget most of it and did not study it for like... 15 years already.
I always like to think of it applied to a gym workout. Torque is how much your max bench press is. Horsepower is how much weight you lifted over a time period( say, 1,000 kg in 60 seconds). Someone benching 100kg 10 times in 60 seconds is the same Horsepower as someone benching 200kg 5 times in 60 seconds. The second guy has twice the torque, but half the speed. Same horsepower.
Good analogy, demonstration. For horsepower, when I was a teen, I realized that it was applied "work", and visualized two shipment workers, small guy, and big guy. Small guy used smaller boxes (less weight) to move raw product to packaging, and the big guy, in bigger boxes and units. The small guy was quicker in his payload turn around between runs, but the bigger worker was moving more in one payload. In an hour or so timeframe, they both moved a equal amount of payload, (small guy, advantage by faster rate (RPM), Big guy, advantage by brute strength (TORQUE), while overall "work" (HP) within same margins, boxes = (TRANSMISSION GEARING)
In my teens I had very muscular legs as a defenceman in hockey. At 6'1" and 200 pounds I was faster than smaller, lighter forwards. My legs cycled slower than the legs of shorter players but I was faster because my strides were longer and more powerful.
Yes, and if these guys had my asshole boss as their boss, he would accuse the large guy of being lazy and not working hard and would pay the smaller guy more money even though both are doing the same amount of Work.
This reminds me of those great scientific industrial films from the 1950s, one in particular explains how differential steering works in a car with models, demonstrations, and illustrations. Also the MST3k shorts with industrial films are a pretty good watch too!
@@d4a yes.. you should whack that topic to your next videos. Since lots people almost failed to understand n comparison between those too. Beside between piston n stroker n crankshaft are well related.
I felt the same :) But it is pretty much force lever. He should have said pounds foot to make it less irritating. This is also a good explanation ua-cam.com/video/u-MH4sf5xkY/v-deo.html
@@andreasfrost-blade4689 Yes, the SAE uses foot pounds. Torque is a is the vector cross product of distance multiplied by force and cross products are non-transitive. RxF=-FxR
@@andreasfrost-blade4689 the proper name for torque in SAE is pound feet, it is called pound feet to reduce confusion with foot pound which is a unit or energy not torque. But it doesnt really matter because most people say torque in foot pound anyway and the context will tell you whether or not its torque or energy.
GREAT explanatory video! Part of the additional torque of a diesel engine is due to the greater radius of the crank where the large end of connecting rod is exerting force. It's like accelerating a bicycle with longer pedal arms. You will generate more torque at the center axis of the crank using the same "pushing" force against the pedal while using a longer pedal arm (or pedal crank). A greater crank radius will require longer connecting rods because the distance travelled transversely at the big end is greater and you don't want too great an angle between the connecting rod where it meets the bottom of the piston. A larger diameter crank increases the compression ratio which is higher in a diesel engine (usually 14:1 to 25:1) than in a gasoline engine (8:1 to 12:1). There's plenty more information out there about how diesels differ from gasoline engines.
so that would explain lower rpms i guess....with longer connecting rods, its harder for a big engine to rotate that quickly....granted im in medicine, very little car knowledge
But doesn't it also take more power to over come a longer stroke? A small combustion chamber would fizzle out right? I believe this is the reason why framing nail guns have huge heads versus the small ones on a trim gun
The only correction required here is, that compression ratio is independent of both connecting rod length and crank radius. Its limited/chosen in each type of engine based on many other factors.
@@waleed172 So true! Sometimes I had to pause their video to look for the certain example that they are using to explain the main topic. Donut media videos are for semi-pro people. Not for the beginners.
well maybe if i SCREAM MY POINT AT YOU YOU'D UNDERSTAND! MORE POWER BABY! lIGHTNING LIGHTNING LIGHTNING! AAAAAAHHHHHHH! there you go. summed up every doughnut media video that doesn't have Nolan as the main talking head.
@@waleed172 yeah I agree, their videos are entertaining, but it really depends on the person, for me this video made the concept clear, maybe other people understood concept better when they explained it. Not attacking Donut just expressing what I thought.
"Newton meters confuse you?" "Yah most people don't really know how much force a Newton is" "You can also use foot pounds" *Confused non-american noises*
@@___-tp1su it doesn't change the fact that is still a force and a distance so it didn't make anything clearer by changing it. If someone doesn't know that a meter is a distance then they shouldn't be here in the first place don't you think?
Easily comprehendible, honestly horsepower was one of the concepts that I couldn't wrap my head around. Now am familiar with it I'll have to think about it more but at least I'll know how to think about. Thank you for the video
Left to my own devices I'd have defined 'horsepower' with the actual definition of torque before seeing this video. Sometimes the UA-cam algorithm does good things like feeding my idle curiosity about how stuff works, and now I know better than I did yesterday.
think about weight ratio too. think about gearing that manipulate torque. his other video is good but HP and torque is the hardest to explain. also, not everyone understand it fully - reason i said fully because this is why car manufacture have races and time laps base on certain requirement.
Well yeah, it's hard to wrap your head around PRECISELY because horsepower a useless bullshit metric. All power is generated in the engine. Measured in torque. Higher RPM, for any given torque value, gives you more so-called "horsepower". Ok, that's fine, but that's useless information. Because if I want to go faster, I change the gears. Thus: I'll take the 300ft/lbs 100HP motor over the 100ft/lbs 300hp motor every time.
@@robwoodring9437Yep. Car marketing over the decades has convinced everyone that HP is power. When in fact, it's torque that matters. The HP number is usually bigger. So they market with it.
@@mustangstuff7213You’ve got it backwards. Gearboxes negate the need for high engine torque, not horsepower. You can use gearing to make the torque to the wheels whatever you want. That won’t change the work the engine is capable of doing. With gearing appropriate for both and the same car body, a 300hp/100ftlb engine will out accelerate a 100hp/300ftlb every single time and it’s not even close.
This video isn't what i've searched for, i just opened UA-cam and it was here, and since i was very confused on how they acted, i clicked it. Thanks for the explanation~
Good job adding more confusion. Corrections. You don't feel the torque in your car, you feel the transition over time. That's power. Big engines are not used to provide more power, rather reliability and efficency. The gear box is a torque multiplier, at any given speed the power dictates how much torque is at the wheels.. Two motors spinning at the same rpm the one with more torque has more power at THAT rpm. Your two little motors have different power curves.
Newtons law of motion To moowe 160kg takes 160.1 kg That's why !!! When you (Americans rolig coale) Figur out that it AIN't the black smoke !!and HP in a DISEL But the Newton Meters moovin the truck!! (Funny max DISEL Newton meter is @100/1500RPM dependent on enigen)
@@kennethschultz6465 it literally is the HP moving the truck. This is proved by the fact that when shifting at peak torque the truck accelerates slower than when shifting at peak HP.
Very simply, I always put it as Torque = how much weight you can pull HP= how fast you can pull the weight (or, also, how fast you can accelerate the weight)
Personally, I like to think of it as Torque = performance in Gear 1 and at cruising speeds. That's when the engine isn't generating maximum HP and where you'll feel the difference.
Right, because horsepower is force times speed, and torque is essentially force. (Technically, force times distance from the centre of rotation, but the main point here is the force.)
Fantastic instructional video!. I'm a mechanical engineer with 20+ yrs professional experience,... And I've never seen a better 'down to earth' explanation of power vs torque. Well done 👍
I think it might be helpful to think about the electrical analogue of Torque and RPM as Voltage and Current, respectively. In both cases the product of the two results in Power. Voltage and Torque are what you need to overcome electrical resistance or mechanical friction, while current and RPM are the time dependent concepts that help you deliver high Power once you overcame the initial barrier. Maybe the analogy would be more accurate when you think about increasing voltage in order to create a dielectric breakdown to get the current flowing. I think this is very similar to using torque to make the wheels start spinning when you have a heavy load or are in a very inclined slope.
45 years ago we had a motorcycle dyno that used a jet engine starter/generator to heat coils, wasting the power as heat. So we got a voltage and amperage reading, multiplied them to get watts, _and then divided by 746 to get horsepower._ We already had the SI unit, but didn't know it, and everyone knows horsepower in the USA.
Nice video and good explanation, with a couple caveats that I'd like to address: 1. You described HP as the "rate of torque". A more stringent/understandable description is that force/torque performs "work", which is measured in J (Joule). Work is a force applied over a _distance_ ; for example using a force of 50 Nm to push a stone block over a distance of 1 m. The work then equals 50 Nm x 1 m = 50 Joule. In other words work = energy spent (pretty logical, ey?). Furthermore, to lift a certain weight to a certain height requires the same amount of work/energy _no matter_ how quickly it's done. Work is timeless. For example transporting a dragster over a quarter mile - can be done in a month by a LEGO motor or in 4 seconds by a nitro guzzling top fuel engine. The work is the same! However, if you set a time requirement, then we are talking about power; energy delivered _per time unit_ . So if we push that stone 1 m in 1 second we get 50 Nm x 1 m / 1 s = 50 J/s (Joules per second) = 50 W (Watt) = 0,05 kW = 0.068 HP. That's _power_ ! ... i.e. how _fast_ you can get stuff done. How fast you can get that dragster through the quarter mile. How fast you do 0-60 in a 3 tonne car. And that's what you feel, actually. 2. One doesn't "feel" the torque of the engine during acceleration. You feel the force from the seat on your back. The force from your seat is generated by the _power_ of your engine. It doesn't matter if the power comes from a large engine producing 1000 Nm @ 3000 RPM or a small engine producing 200 Nm @ 15000 RPM - _your ass will not know the difference_ !!! To conclude: the torque of the engine has nothing to do with the force which accelerates your car. The source of that feeling is your engine power _transformed into torque_ by your transmission, diff and wheel diameter and then transformed into frictional force by your tyres. The force from the tyres causes the car to accelerate, which in turn pushes you in the back. Now, if _frictional force_ is what is being discussed, then talking about Newton meters is of course highly relevant. But that's not what people talk about when they're bragging to their buddies about the "insane amounts of torque" their V8 is generating... Bragging about torque without regard to RPM is like bragging about RPM without regard to torque (think RC engine @ 30000 RPM - you aren't setting any records with one of those!). Power (kW) ≈ Torque (Nm) x RPM / 9.55 Power is what you want. You can achieve it by lots of torque (at modest RPM) _or_ lots of RPM (with modest torque). If you have both, then you've got a f*cking boatload.
@@TigerDude333 the human body can only "feel" acceleration. Without rpm your body would feel the torque, and with rpm its power. You're still not really feeling power though, just acceleration.
@@TigerDude333 I don't think you are making yourself very clear. Wish to expand on that so that I can reply? You are talking about engine torque, right? Maybe you misunderstood what I wrote? If you can clearly point out and explain where/how my logic is failing, I am more than glad to discuss it (and perhaps learn something in the process, I see no pride in being right). What we can agree on (i hope) is that you experience acceleration (and a push in the back). If you trace back from those phenomena you shall see that a ∝ P, which doesn't hold true for torque. Here's a good example: i.stack.imgur.com/XEH9Z.png Where's the push in your back (what you feel) the strongest? @ 2000 RPM or @ 5000 RPM? What I said in my above post was that torque is nothing without RPM. That alone should disqualify the argument "torque is what you feel".
Simple and effective way of explaining what is torque, horsepower and the difference between them. And also a plethora of different terminologies along the way. Brilliant! 🙌🏽
Man, I never really totally understood the difference between the two until now. Even after watching many different videos from engineering channels. Thanks!
Thank you for the great demonstration. As a motorcycle rider, I hear lots of debates about this topic. One analogy I use, which demonstrates the difference well IMO. An R6 600cc with 40ft lbs of torque at 12,000 rpm, will make the same torque at the back wheel as a R1 1000cc 80 ft lbs of torque at 6,000 rpm, with both bikes traveling at the same speed. This is why HP is important.
Riddle me this. In your example in light of the video definition of HP (torque x RPM), the math on both the R6 and the R1 = 480,000 HP. This obviously is no true. Why? I may be bad at math, but I did use a calculator. Appreciate a response.
As a former powerlifter, the Eddie Hall image vs the body builder is perfect. The body builder is endurance(horsepower), the powerlifter is explosive short term strength(torque). The body builder cannot deadlift 1000lbs but can deadlift 100lbs for more reps, because of the way each respective man's muscles are trained. Excellent video, thank you.
Exactly, you can create double torque just with having speed halving gearing and power stays exactly the same if we just ignorre small gearing losses to simplify things.
@@Karjis I was thinking the same thing. Using gear ratios to reduce the rpm at the tire (using a vehicle as an example) you can get the same amount of torque applied to the ground as a much larger engine.
@@kevinbuhler8776 An even better example is a bicycle. You can see the transmission (it's called a cassette), so it's a great way to understand gear ratios. In a lower gear, the gear size is bigger. One turn of the pedals might make gear 1 make one rotation. Gear 1 is terrible for speed, but it's great for power, such as just starting off, or going up a hill. Compare that, to say, gear 7 (I'm using that because it's my bike's highest gear). Gear 7 is visibly smaller, and makes many rotations with one turn of the pedals. It's great for cruising along in a straight line fast. But you'll terribly hurt your knees if you don't move to a lower gear if you need to go slower, or if you're going up a hill. In fact, for anyone who's interested in learning to drive a manual car, I would recommend to them that they first play around with the gears on a bike. It makes learning to drive stick much easier, because they will better understand the concept of low versus high gears.
I have watched numerous videos explaining horsepower and torque. I kind-of got it. After this video, I completely understand. All of the videos, including this one, have the same information. It is just how it is explained. Thank you again D4A!
I think it's also worth pointing out that gearing can be used to compensate for a lack of torque. That is to say that, theoretically, two cars with vastly different torque, but the same horsepower, could accelerate/pull with the same force if the gear ratios are scaled. For this reason, you can roughly compare how two vehicles of similar weight can accelerate based on horsepower alone (e.g., mustangs and camaros with equivalent transmissions have nearly identical acceleration times with very different torque, but nearly identical horsepower). I say theoretically because the engine with more torque will probably have heavier engine and transmission components, more inertia, etc., and will be slower to rev up with no load. Add in that the shape of the power curves, gearing, drive line losses, etc. will probably not perfectly line up, and you get a bit of a mess. Now, another benefit of using horsepower as a metric is it tells you when, for any given car, you should be shifting to achieve maximum acceleration. And that moment occurs when the power at a given RPM is equal to what power will be at the new RPM after completion of the shift (assuming of course that you do not get valve float first 👀, in which case, that's when you want to shift lol).
This video only refers to torque at the crank, which is simplified for the general audience. A sports car can have a high revving engine, which enables higher gear ratios, which multiply the torque, so there is more torque at the wheels than at the crank.
@@Obi-WanKannabis Yeah. I wish people wouldn't try to make that simplification. A person isn't really understanding what power is in a vehicle until they see that it isn't altered by the choice of gear, while torque and rpm are altered dramatically and inversely. Then you see that at every speed, power is related directly to thrust (unless there is a burning smell;)
@@drienkm I will also note that as the car accelerates it shifts into higher gears so the propuslive force from the wheels is less, but since the velocity is higher the horsepower remains the same
@@forloop7713 Yes, but gear ratios multiply it differently, if your car revs to 9000 rpm you're going to multiply that torque more than if it revs to 6000.
6:20 When a car accelerates there is no force pushing you into the the seat, but there is a force pushing the seat into you. The car is being forced to accelerate, but the passengers (as independent, relatively stationary masses with respect to the car) just happen to be in the way as the car is pushing against them. From our perspective it feels like we're being "pushed into the seat" but if you think about it, it makes sense that the car is actually pushing against you, because the engine also needs to accelerate you to the speed of the car and all of its components.
@@Obi-WanKannabis Well thanks to inertia you want to follow the straight line in space-time which would bring you into the seat and curving towards the center of earths gravity. It's the normal force from the seat that constantly pushes you off that path.
I barely comment on videos but here I’m compelled to express how amazing this explanation is. Unbelievably detailed and yet understandable. Can’t wait until my kid is old enough to watch this and more of your videos 👍🏾
Excellent video! The key is, as you noted several times, that HP is energy (as force)applied over time. A low amount of force applied rapidly can represent a lot of power. Torque is force applied over distance (arm) independent of time. Two different animals.
I don't agree with him on that. You can only feel horse power. You have to apply torque over time to feel it. We can't experience things in infinity small amounts of time. It's like saying you can eat a cheese burger without the cheese. It's not a cheese burger till you have both.
@@pleasedontwatchthese9593 horsepower isn't an observable force like torque. It's a measurement of work done. You feel force, not work. It's like saying you can feel time passing. That kick you feel when you step on the gas is the difference in velocity between you and the car as the structure of those 2 things isn't rigid, but independent. It's applied torque.
@@cIappo896 Actually its applied force, waht you feel. Tourque is actually the same thing as Energy. How much force is being experienced depends on the length of the lever that applies the force. Lets got talking about transmissions. In First gear a gear connected to your engine will spin another very big gear. the Force applied near to the inside of the Gear gets applied to the outside of the other gear. If these two gears fight against each other the Smaller gear would have an advantage because moving a long lever requires less force than moving a small lever. You just need a long arm or walk in order to spin a little wheel in any meaningful way with a very long lever. If your lever was shorter you wouldnt have to move as much, but you'd need to apply more force to get the same amount of tourque. Shifting upwards into second gear will put your small gear against a not as big gear. The 2nd gear will spin faster due to its smaller size since you can move lets say 100 teeth/s because it has less teeth than the first gear. But the lever isnt as long anymore so it doesnt have as big of a tourque advantage anymore compared to what it had in the first gear. Thats why you have less acceleration in higher and higher gears. You might have a higher top speed but you cant accelerate as fast in higher gears anymore. If you'd made the engine spin faster however at some point it will fly apart, which is why there are rev limiters so they can prevent this flying apart part. Your theoretical top speed is only determained by three factors: Transmission length (longer transmission = more top speed; less acceleration), max RPM (higher max RPM = more top speed; more power; more acceleration; less durable) and wheel size (larger radius = more top speed; less acceleration). The FORCE applied to the ground depends on what transmission length you have and how much tourque your engine produces. If the force stopping you from going faster (such as wind force or just friction in general) is greater than the force you apply, you can no longer accelerate. Mass is not directly a factor - but mass does affect friction but also increases grip, which increases applyable tourque - so mass cancels out - downforce through a spoiler doesnt - thats why racecars use wings instead of extra mass). Mass does not influence your top speed if your tourque is always as much as physicall possible (so much that your wheels dont start to do a burnout). A burnout means that the force applied is bigger than the applyable force for the grip you have. The friction which is supposed to help you propell is being overcome, this causing your wheels to spin without your car getting accelerated. You do not feel the tourque. You only feel the force. Force is whatever is at some point by the lever. You can feel it very easily by using a nutcracker. Cracking the nut with your bare hands is rather difficult - for some even impossible. Put it into the nutcracker, grab it by the ends of the two levers and push the levers together. Quite easy if you ask me. The force applied by your hands is exactly the same. The force, which cracked the nut was a lot bigger. Depending on the lever length. If the lever was lets say 6 units long and the crack chamber was 1 unit away from the spin center, the force experienced was multiplied by 6/1, which is 6. So if you applied lets say 6Nm of tourque you applied that because you applied 1N of force on a 6m lever. 1*6=6. The Nut experienced 6N because the same tourque applies to all levers 6Nm of tourque means 6N of force at 1m distance from center. It would have felt 24N at 25cm from the center and so on. Meaning: If you had a REALLY long lever you could make the earth stop spinning when you stand at a solid location, which is not attatched to earth. The lever just needs to be able to carry out this much force down on earth because theres gonna be a lot of force. So good luck building that lever.
It might have been worth mentioning that the torque generated by the truck engine is not only due to larger cylinder volume and piston diameter resulting in greater reciprocal force through combustion but equally important is the greater distance of the crank throw from the point of rotation creating a leverage effect for that force to act upon. It would have tied nicely into your example of torque measurement using the 1 metre lever bar on the bolt with the applied force.
Another wrinkle with Diesel engines is that the fuel itself contains more energy than gasoline. A second difference to consider is that gasoline is more explosive, whereas diesel burns and becomes more explosive under pressure. When detonation occurs, gasoline goes out with a bang. Detonation with a Diesel engine is a slower explosion which pushes on the piston longer than a gasoline detonation. This is also a contributing factor for why Diesel engines generate more torque than an equivalent gasoline engine. It is also a reason why Diesel engines don’t rev as high as gasoline engines, the slower burn creates a cap on how high your engine revs can be before your engine would outrun the combustion process.
@@krys8494 Gasoline detonates faster for higher performance applications. Costs less to produce since compressions ratios (air to fuel mixture) are lower than Diesel engines so the engine and its operating parts doesn’t have to be built as heavy duty.
@UCLK3WKx3l3Mod5fV-RqenGA my dad had an Ford F700 with a small block gas engine in it years ago. It was slow and and a turtle could out accelerate it! To some extent what you are saying is true about torque, especially when you can add gear reduction, but gear reduction adds weight and complexity which can be a drawback when a diesel can do it better if designed for the specific application. What this boils down to is we need different designs for different applications because a one size fits all approach doesn’t work. Maybe think of horsepower as how eager an engine is to work, and torque is how hard it can work. I could hook up a 30,000 lbs trailer to a truck with 1,000 hp and 500 ft lbs of torque and even though that engine is very eager to rev and accelerate, that 30,000 lbs will temper that eagerness quite a lot. However, a truck with a diesel that has 1,000 ft lbs and 400 hp will have no problem carting that 30,000 lb trailer around and up hills.
Good video! But just a small note: the larger torque of the truck engine compared to the car engine, does not in itself explain why it's more suitable for heavy vehicles. Because the usefulness of the torque is always the resulting power. If you have the same power at a certain speed the torque does not matter. The reason that the small car engine is not as suitable to run a truck(despite it can can have the same or higher maximum power) is that the average power through the rpm is lower. The small engine could run the truck, but it would require more number of gears to be practical. And if you use a variator, torque does not matter at all: a low torque then in any moment can be compensated with higher rpm. Apart from that, another reason to use large engines to heavy vehicles is of course the lifetime and intervall of service. A car engine would probably break more or less regularly by the strain of pulling such a heavy loads constantly at high rpm.
At least someone understands it. I think it's pretty important if not the most important, and nobofy ever mentions it. Torque, by itself, is pretty much irrelevant. Any engine can produce any torque through set of gears.
@@AndreiSZS thats torque at the wheels. The engine is still only producing a certain amount of torque and gears can multiply that to an extent but there’s still a limit to the amount you can do that. But ultimately it is the torque at the wheels that will give you acceleration
@@AndreiSZS engine torque is very relevant when calculating horsepower. And yes technically you could build any size engine to achieve any specified amount of torque though it wouldn’t always be practical as a small engine will need to rev at a very high rpm to produce large amounts of torque whereas a large engine will rev much lower to produce that same torque. This also means the small engine will produce more horsepower than the large engine if max torque output is the same. If both engines were installed in the same size vehicle the small engine would achieve a higher top speed and the larger engine would likely accelerate faster. Unless you geared each car differently to compensate
Nice explanation, but I think what most people are confused about is not the difference between power and torque, but why torque in a car engine matters at all if there is a gear box available. A small powerful engine with initially small torque will provide a larger torque than a less powerful large engine with initially larger torque given a proper gear ratio. However, it will come at the cost of much higher rpm which reduces efficiency. A high torque number pretty much indicates that the vehicle is designed to be efficient when pulling heavy loads at relatively low speeds.
Frankly speaking, this is one of the best physics videos I’ve seen in nearly 30 years. I’ve always been apprehensive about topics like this and circular motion, but this video 🎥 transformed my perspective and dispelled my fears. Even though I’m in medicine, not engineering, it blew my mind 🤯. Why don’t our teachers teach like this? I think some might be in the wrong profession; they teach because they feel they have no other options 🤷. I love learning new things every day, and today, this was a remarkable lesson 📚🌟.
Torque at the wheels are important for acceleration, you simply need F (force). F=m*a Using gears you can change the amount of force (torque) applied to the wheels, but you won’t change the hp output at the wheels. More torque, but less frequent, lineair relationship! Pull away in 1st gear: goes pretty fast with any car (wheel spin=maximum force you can apply!). But acceleration becomes worse while shifting up, in any car. Only those with huge amounts of torque quickly accelerate in high gear, but still slower than in lower gear. Side note: torque and power curves drop above a certain rpm, mostly because of a combination of starvation (can’t pump enough air in through the inlets), resistance (pump out exhaust gasses, mechanical friction), valves that can’t cope with the quick opening and closing, and simply too high forces on crankshaft and pistons which will make the engine disintegrate. Otherwise, more rpm would result in more hp.
@@maddeningmonk9585 good engineering to get around the listed issues with running at high rpm, see : double overhead cams/4 valve cylinders well ported heads higher conpression etc. A well engineered engine can maintain its torque at very high rpms, just look a formula 1. Or just lower the redline lol
@@benfennell6842 i mean some cars for example make peak power at 6500rpm and peak torque at 2000rpm. Their power curve will keep in climbing till the red line. The torque will gradually decline but the power will keep on increasing till redline. I'm talking about normal everyday Street cars and not f1 or other vehicles. I don't want to call f1 cars because they ugly as fuck
Yes, half true. a gearbox is also needed to spin the wheels slower or faster than the engine speed. Since the engine has a maximum power (torque x speed) the gearbox can increase torque by sacrificing wheel speed (HIGH TORQUE x low speed) or, increase wheel speed by sacrificing torque (low torque x HIGH SPEED)
@@spamtes So theoretically you could use the GTR engine in a truck (since it has actually more horsepower at 7k rpm), but you would have to have a transmission decrease the rotations dramatically to get the same (or higher) torque as the truck? Could you also do the inverse and use the truck engine in the car and have the transmission speed up the rotations and with that decrease torque?
@@EndstyleGG Sort of. If both engines had constant horsepower then you would be right, since lowering RPM would necessarily increase torque. In reality, torque and horsepower are dependent on RPM (search for engine power curve or torque curve) and throttle, so the figures which are usually shown for engines are peak torque and peak horsepower at full throttle. Also, if you're searching for these curves and happen to find both for a same engine, notice how peak power doesn't occur at the same RPM as peak torque (usually).
Amazing, thank you. Just two more facts based on your video that comes to my head: 1) You can rise torque of any motor by gearbox, but you cant easily change its powe output (HP or kW), it remains the same. 2) Newtonmeters can be also roughly explained as 1Nm is 0,1Kg on 1m long lever.
Cycling uphill, if your legs can exert enough energy to go up a steep angle, thus your legs have a high amount of torque to push yourself up even though you are pedalling slowly. Cycling downhill, if your legs can cycle fast enough to accelerate down a steep angle, thus your legs were able to generate a high amount of horsepower due to your speed of pedalling, even though each time you pedal requires way lesser torque than when you're cycling uphill.
"newton meters confuse you? no problem, torque is also can be easily expressed in foot pounds..." that is the best laughter i had for a while, i was so unprepared for it.
And he got it wrong. You do not feel the torque. If the engine doesn't move it doesn't matter how much torque it's producing. It's producing NO power. With the smaller motor you can apply a gear to make them turn at the same rate. What number tells you the force after gearing.. THE HP NUMBER. The work done is what you feel. If you have your finger directly to the shaft you're feeling the POWER of the magnetic forces.
Hi, engineer here. Good explanation but there's a couple of misleading points. 1. You can't spin both electric motors freely and claim that the small motor rotates twice as fast, thus can have 1/4 the torque but only 1/2 the hp. At peak rpm as shown in 5:16, the torque is effectively 0. This is true because if torque is > 0, the shafts will continue to accelerate. The rough calculations were close because the ratio of rpm at peak torque between the 2 motors is about the same as the ratio of peak rpm between them. 2. 6:25 - 6:35 you mentioned that torque can be felt but not horsepower. While this is true, it may mislead people into thinking that acceleration depends on torque and not horsepower. Let's talk about 2 hypothetical engines, A and B. A has high hp low torque. B has high torque low hp. Torque at the wheels is what matters and A can be geared down to produce more torque than B at any specific speed. Put the sports car engine in the truck with a custom gearbox (or a perfect CVT) and it will accelerate the truck faster than with a truck engine. The real reason why trucks need high torque engines is for fuel efficiency and reliability. You can't redline a high hp low torque engine for 12 hours everyday.
I don't think you can gear down a VR38 to match the truck engine's torque figures. Displacement is what generates the torque, which you need to move 20 tons. You're basically saying torque is only down to the horsepower x the gearbox/drivetrain it's matched with. That's essentially BHP.
@@HipsterNgariman nope. the gearbox can change and multiply the torque easily to the torque of the truck. 500Nm to 2500Nm is just a factor of 5. No prob. Thats what a gearbox is for.. The displacement gives you the torque at the crankshaft..the gearbox will give you the torque at the wheels..and thats the only thing you really need!
@@floridrummer88 don't forget, that factor of 5 works both ways, more output torque but also more input RPMs. In other words, if the input is already over 2,000 RPMs you will destroy that engine getting that torque number while maintaining the same output RPMs.
Cool video, but also a bit of a missed opportunity. Saying that "truck engines need more torque to pull greater weights" confuses the issue rather than explains it. They don't need greater torque, the whole thing could be accomplished with the right gearing by a bike engine of the same power. The point with the truck engines is that they can run at much lower rpm, which is good for fuel efficiency and wear. There could have been another 10 minutes of the video where you attach gears to both motors and show how this manipulates the torque and the speed. Then you could put the motors in a lego car and show how acceleration and top speed are affected when different gearing is used. That, I think, would be most enlightening. Maybe part 2? ;)
As a new subscriber; I'm absolutely impressed with how the graphics along the explanation bring everything together, which makes everything so understandable! Almost like a magic trick, it's easy when you know how it's done....I'm hooked on your vids.
Good explanation. Really, the whole thing could be summarised as "power = torque times rpm". The confusion comes from the words being used lazily or inaccurately by the biking community (I'm a biker) and (I guess) the car community. You hear all this stuff about "power is how fast you hit the wall and torque is how far you move the wall" which is unhelpful. A vehicle can deploy the same amount of power with low torque at high revs, or high toque at low revs. Power dictates how fast the vehicle will go, allowing for weight, friction, air resistance, etc. because it is work done in a given period of time. The torque could theoretically be measured at any rotating axis from the crank shaft, through the gearbox input shaft, gearbox output shaft, and as far as the driven wheel. If (for simplicity) you ignore losses through friction, at any one of these places, the torque may be different, but torque x revs will equal the same amount of power. In real life, you can't ignore losses through friction. That is why you can't go to the absurd and use a 1 rpm engine with an enormous gear ratio to get high speed, or a 20,000 rpm bike engine geared down ridiculously to pull a truck.
Something important about the difference between sports and heavy duty engines. The real reason big machines need torquey motors is because they need to use all their horsepower all the time. A crankshaft bearing, camshaft, or cylinder wall can only take so many rotations before things wear out, so machines that need to work all day want to keep their rpms low if they are going to last. The only way to make horsepower at low rpm is by having torque. Fundamentally though, a gtr with the right gearbox could tow a semi trailer faster than that semi can, it will just wear out sooner.
Another factor to consider is efficiency. An engines brake specific fuel consumption is very high at high rpms. This because of the rich air/fuel mixtures and high friction losses that occur at high rpms and high loads. ICEs are generally most efficient at around 1500-2500 rpm (this can vary depending on the engine) at high loads. Sports car owners don’t really care about fuel economy but truck drivers who travel hundreds of miles everyday do care. Because diesel engines make so much toque, they can make a lot of horsepower at the low rpms it has where BSFC is at its lowest.
I liked this very much. One thing that might confuse people that i saw, because it confused me for a moment... is that the lower hp motor spins faster than the higher hp motor. Maybe it was just me! Thanks for the content!
I think I get the gist......he didn't come out & say it but your answer is implied in the description of sports car motor vs. truck motor. The reason that one motor spins faster than the other is not just "cuz they were designed to". They have different intended purposes, yes, but the designers have only two numbers they can manipulate. If you need max HP, you gotta make torque & RPM work together. If you need more torque, you'll be limited in your max RPM and HP. You want more of one thing? It'll cost ya some of the other, cuz, natural laws and all that.......nothing is created or destroyed, but merely transformed.
Another very well explained topic in that video, most people describing that doesn't manage to put it that precise (or the blatantly forget about the power per time thing for the HrsPrs..) . Thank you very much and now stow your Lego's away safely before you step on em!!! :| We need you making new videos with intact feet!
I hate how nobody stresses that horsepower is the only unit that matters in a vehicle. Higher torque vehicles produce more power at a lower rpm. Theoretically you can tow with that GTR engine but it is impractical due to the fact that you'd sit at 6000 rpm constantly. It's like when turbine engines were becoming popular, they were out producing power-wise and were better in every way except noise and fuel consumption.
For the majority people this is true if you want a fast daily driver, however if you tow anything knowing the torque can be just as important as to know the efficiency of that engine; I'd rather have a vehicle sit at 2000rpms rather than on redline going down the highway with a trailer hooked up to me
The only time high horse power is relevant is for track/drag racing or if your lucky enough to have roads with no speed limits, but for everyday driving about the streets/highways having a high horse power car is pointless, you would need to be driving around doing 100mph+ to actually use all the power available, at least with diesels you get to play with all the power as most fade off around 100mph-ish and driving faster than that on public roads is a bit stupid and doing more than a 100mph here in the uk is usually an automatic ban if caught, high horse powered cars are the same as high end PCs, pointless if you can't use it to its full potential.
Low RPM high Torque figures are only relevant in towing because you are producing more Power at Lower RPM which is more efficient in that use case due to all sorts of factors including angular velocities, clutches, fuel consumption, reliability, rotational and dynamic mass etc. Truck engines have to be strong due to the forces required in order to move large masses therefore it isn't reliable to use a lightweight sports car engine that revs high due to its lightweight components (not as strong) in order to produce its Power Output thus transferring huge angular velocities into the drive train to move huge masses at lower speeds, it doesn't make sense. Higher torque values at lower RPMs can make daily driving regular vehicles easier due to not having to rev the engine for Power however Torque values are meaningless unless the RPM at which the Torque is produced at is explicitly stated otherwise it is a utterly meaningless value and you may aswell just state the Power figure at that given RPM anyway because that is more meaningful since to understand the Work Done you have to do the calculation of Torque x RPM/5252 and hey you get Power. Furthermore engine torque is meaningless to the consumer because what is produced goes through a gearbox so your wheel torque is totally different to your engine torque. Torque is only important to a tuner or an engineer to determine the strength or the required strength of components, otherwise all the consumer is interested in is the power at a given RPM. YOU CANNOT FEEL TORQUE IN A CAR ONLY POWER/WORK DONE. The best analogy I can personally come up with and is relevant to this is if you tighten a bolt to 60Nm with a torque wrench then try to loosen it at 30Nm you get 0RPM therefore 0 work is done, the Bolt goes nowhere, you cannot feel any acceleration force because there is none. To conclude Torque is meaningless without RPM in vehicle performance and with RPM you are left with Power (don't confuse with peak power) which is the only meaningful value. I'm a mechanical engineer and I hope this helps
I've always wondered what's the difference but no video made me really understand better than your way. It was clear, educating and easy to get. Thank you
Another important thing too - torque isn't constant over the rpm range of an engine. It will have a point where it creates it's maximum torque then starts dropping. Having peak torque at low rpm means you'll have more power available at very very low speeds where you can't shift into a gear lower than 1. The engine will have lower overall power than an engine with the same max torque that occurs at a higher rpm though, since power is torque * rpm. A sports car with 400hp and 250 lbft of torque can pull a trailer faster up a hill than a truck can, but the truck with 300hp and 250lbft has more power at 1000 rpm to start pulling it up a hill if there's a stop.
Is that why trains, semi trucks, diesel pickups, and electric vehicles have superior torque? You cant replicate the towing capacity of a high torque power source with simple gearing. Both horsepower and torque are important but in the realm of hauling cargo torque is more important. The same theory can be applied to power and air tools. A simple drill can be good for tapping holes and securing bolts and screws when there is little resistance. Whenever there is any resistance an impact gun with superior torque is used.
thats what i am saying in a lot of discussions and people who dont have a clue will always start to rage about torque beeing important. Then you tell them that more torque at the same rpm means more horsepower and they seem to never come back again.
@@belowpovertylineminority Why do such a long text just to tell you didn't understand anything at all about the video, or things in general? Small vehicles won't make as good towing equipment as heavier, because the towing force limit is set by weight on wheels. As for using impact guns, those are used because the counter forces from the rapid impulses are absorbed by impact gun inertia. A really high torque applications (like Hytorc) uses pure torque and need to be anchored in place, it would braid arm bones together in an instant if held by hand.
Torque is identical to work. Torque is telling you how much work is done in 1 radian of rotation (the amount of work done in 1 rotation is 2*pi*torque). RPM is frequency, so it's the inverse of time. Multiplying by rpm is equivalent to dividing by time.
@@shadowboy813 if torque is not great enough to overcome resistance, no work will be done. Work is torque times rotation angle. Work is also a force times distance. If you apply force to push an object but it won't move, you make no work.
Excellent video. I have had a lot of motorcycles all different sizes and this explains the sensation of going from a 600cc bike that can do 160mph to a 1200cc which can only do 120mph, but feels much more powerful. I can pull away in 2nd gear no problem and go fast with low RPM and not worry about changing gears so much. The 600cc bike red lined at 14k RPM but you needed high revs to get any sort of power out of it because at low RPM it was gutless.
i agree. i have a 1999 gt mustang and the torque increase you feel with 4.10 gears is phenomenal. gearing is seriously an underrated way to increase power in a car/truck
I love this video, but I think one thing is always overlooked: ft-lbs is work or energy, or it can be a moment about an axis, i.e. a static force. Torque, a movement force involving rotation, should be represented by lb-ft (or lbs-ft) per SAE.
11 місяців тому
I'm not that familiar with the imperial system, but that's a bit confusing 😅
Great explanation, you have been able to give a very concise and clear explanation of a parameter which frequently confused both the amateur motor enthusiasts and professional mechanics alike. 👍👍
Thanks for a easy to understand illustration of the difference between HP and Torque. However, I know what a pound is as it applys to foot pounds, but what is a Newton. The only one's I'm familiar with come in a pack and in different flavors; fig being the original and today, blueberry and strawberry. I think it would help other viewers too since most torque wrenches read both.
By definition "Newton" is a unit of force that would accelerate 1kg mass by 1m/s^2. Once you have that force in mind if you apply it over the lever that is 1 meter long to rotate something you get 1 Nm. Given that on earth gravity gives objects downward acceleration of 9.81 m/s^2, you can multiply your mass in kilograms by that number (sometimes rounded to 10 in less rigorous scenarios) to find how much force in Newtons your body exerts over Earth surface.
Still not understanding how the smaller motor has greater RPM than the large one. If the larger motor produces more torque, why does it not have greater RPM? I would think it would have a greater rate of force application as a result. What am I not getting?
This video, as most videos about torque, is actually a bit misleading. Torque and Power are in direct relationship with each other. The reason why the bigger engine doesn't have that more power is because its torque decreases as higher RPM (dropping earlier and quicker than on the smaller engine) the metrics given at the beginning of the video are PEAK values. For electric engines that is usually at or near 0 RPM for torque, and as high RPM as it goes for power. At the same RPM, power and torque are always in the same ratio to each other. Power = Torque x RPM.
@@szymoniak75 For the exact reasons WHY this specific motor has a flatter torque curve than the smaller one, you'll have to open it up and see. Probably it's either because the larger motor has a stronger magnetic field that gets saturated more quickly or most likely it has to do with higher back EMF (Electromotive Force) of the bigger engine. It has to do how electric engines work and requires more explanation than would fit in a comment. The important part to understand is that the bigger engine in this case loses more torque at higher RPM than the smaller one, which is not mentioned in the video.
Truck engines are also designed to produce MUCH higher low end torque. Another reason that they spin so slowly is because of higher efficiency and much higher reliability
Yup, that's why sometimes engine with large displacement can be actually more efficient than the small displacement engine with the similar power output because the main factor of that is that at which rpm the peak power or torque is generated, if you have an engine with 500HP generated at 7 to 8k RPM, it could be less efficient than another engine with the same horsepower but the peak power or torque is generated at a significantly lower RPM (but this can be wrong too because determining how efficient the engine cannot be done that easily because there are many factors that can determine how efficient an engine is)
@@FrankTheile correct, but otherwise, lower reciprocating mass means it's able to Rev higher, that's why most of the motorbike engines are having oversquared design which means the stroke is very short and the bore is larger (you can imagine a bore size of 60 to 90mm with a relatively short stroke of 45 to 50mm) whilst trucks and buses engines are the opposite, they have a really long stroke but smaller bore size due to stroke being so much longer than the bore size itself
In this case I think Foot Pounds is a better measurement because a pound of force is something very easy to contextualize. Newtons not so much. KG/Meter would have made more sense to me.
Holy shit. You actually did it. I GET IT NOW Torque is torque, but horsepower is how quickly that torque is applied. On a dyno, you get a torque graph,which peaks in the 2-3k range and then tails off. BUT, despite having less torque at high end, that lesser amount of torque _is applied more rapidly,_ thus higher HP in high rev range. Wow! I genuinely thought intuitive HP calculatuons would stay a mystery for me, thank you mate love ur channel
Yes, and if you have a high-torque, low-horsepower race car, there's nothing you can do about it. The cars with the horsepower will blow your doors off.
@@NAmania if you drop the rpm, but raise the torque (exactly what happens on a super short gear) the wheels don't spin very fast. Which means the car does not go very fast
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FORCED INDCUTION MOTORS in your example was a bad idea.
Damn you again with anothr bad example. The guy on the left can generate alot more force in a static position then the guy on the right. The guy on the right is just fatbuff. the guy on the left easily reps 3 plates on the bench and is only bested by the fat guys potential momentum. Which is likely only another 125lbs if they are the same height.
Thank you for explaining this stuff bro
Wala and the the team will also have the same problem with with
Amazon Link for Nissan GT-R?
Okay, you weren't kidding, this is actually a really good explanation. You really didn't mess around with any other fluff, you got to the point and explained it with brilliant visual demonstrations. Well done.
Glad it impressed some random person on UA-cam
Extremely rare these days,(keeping it real) well done on the video, I'm learning a different to explain it better to customers and friends with better terminology.
True that!
Borderlands and cars. 👊🏻
@@lambonasty Hell yeah bruv, gotta catch a ride!
As a Mechanical Engineer, I cannot believe you just explained the conceptual difference between Torque and HorsePower better than EVERY SINGLE professor I've ever had!
@@Excludos what did he skip over? It seems pretty competitive to me
@@mediumfast with the right gear ratio the the more powerful sportscar engine would accelerate the truck faster than the truck engine.
@@ZiegenMeisterV1 No it wouldn't, the GRS905 gearbox that Scania uses for the truck in the video already has 14 gears crammed in it with the 1st gear ratio being around 16:1 for an output torque of around 40000Nm. The Nissan engine would need a 1st gear ratio of 63:1 just to get the truck to move. A simpler explanation of the relationship between power and torque is power determines how fast you can go, torque determines how fast you can accelerate/how much mass you can pull.
@@leeowen4989 one thing that I never understood though... diesel cars tend to have way more torque than petrol cars, yet often need more time from 0-60. how come?
@@uNki23 It is usually because diesel engines can't rev as high as petrol engines and also rely heavily on a turbocharger. That said though, modern diesels are much more refined and are just as capable as petrol with much better fuel efficiency.
"Newton meters confuse you?"
Me: yes
"It can be also explained in foot pounds"
Me: dafaq
in russian: " dha-nu-nakhoy!" )))
😂😂
It can me measured in, ugga-duggas too....
That would be foot pounds (force), not foot pounds (mass).
@@johndough9187 Hey you with the Dynamics!....we don't need your kind in the Newtonian Mechanics here.
One important additional difference to note is, that TORQUE CAN BE CHANGED by a GEARBOX - you can trade rotational speed for torque or vice-versa. But power is conserved - no gearbox can make power out of nothing. This is essential, and why we have transmission in the first place. You could pull a truck with a Nissan engine, you would just need a low range gearbox.
Yes but that Truck will move very slowly
@@torevenheim9607 and the transmission would be bigger than the engine lol
Is this on the lines of what Archimedes said? "If you give me a lever and a place to stand, I can move the world. "
@@shantanupathak6701 Exactly like that, gears are just circular levers. The same works for belt drive.
@@Simon-fg8iz
Thanks SIMON. That makes more sense now. I own a 2008 SCION TC with a 4cyl 2.4L and it's very torquey and they are known for that.
Over the years I have driven cars with Bigger Engines most commonly the 3.4L and they didn't feel no where near my TC but now I understand the Low Range Transmission vastly improves Torque performance.
Meaning 2 Cars with SAME EXACT ENGINE Size can have 2 Varying TORQUE Ratings due to the Gearing Ratio.
A Corolla with 2.4L feels sluggish versus my SCION TC with the same exact Engine.
Makes Sense now.
Thanks again Simon
I love how this video gets straight to the point. Doesn't have a long intro or some history lesson to artificially make the video longer. It's perfect.
And with no sponsor ads. At least, not YET. lol!
This video actually perpetuates a lot of myths about torque and its importance.
@@alanartwww Make your point then, please.
@@ulysses_grant Here LOL _ua-cam.com/video/41b-ZL5vSmc_/v-deo.html
@@ulysses_grant an engine's pulling power is related to its horsepower, not torque, this is proven when you see a gas turbine competition tractor do a full pull, gas turbines are low torque high RPM engines.
4:13 *D4A* “The key word in the word horsepower is...”
*Me, an intellectual* “Horse!”
*D4A* “Power!”
*Me* “...”
😂😂😂
Seems funny to use the term "horsepower" but not "waterwheeltorque". :)
same, except I'm not an intellectual.
@@thromboid I don't see it. Horse power = calculated average maximum power exerted based on observation of (wait for it...) horses. The horses were turning a mill (if memory serves), yet we don't call it "mill power". Torque is a measurement calibrated by exerting a known force at a known distance (typically by suspending a reference weight along a beam of measured length). The "brake" or "water wheel" is just a measuring tool to apply this calibration to an observation.
@@ehb403 Don't mind me - I'm just being snooty. :) I've no quibble with horsepower as a unit (other than not being SI) - what seems strange is using it to refer generically to the physical quantity, instead of simply "power" or "mechanical power".
If it's referring to a particular test procedure then that specificity is useful.
I'm not an English speaker, I'm not even a car driver. I also never played with lego engines. Despite that all, I was able to get all the explanations, so that's probably a sign of a good content.
p.s. I was good at physics at school, but forget most of it and did not study it for like... 15 years already.
I always like to think of it applied to a gym workout. Torque is how much your max bench press is. Horsepower is how much weight you lifted over a time period( say, 1,000 kg in 60 seconds).
Someone benching 100kg 10 times in 60 seconds is the same Horsepower as someone benching 200kg 5 times in 60 seconds. The second guy has twice the torque, but half the speed. Same horsepower.
thanks gymbro i understand it now
@@Jocelyn-Blzr same lol
Thanks for Dude-Bro insight for the dude bros
Love the use of Eddie Hall representing the truck😂
Good analogy, demonstration. For horsepower, when I was a teen, I realized that it was applied "work", and visualized two shipment workers, small guy, and big guy. Small guy used smaller boxes (less weight) to move raw product to packaging, and the big guy, in bigger boxes and units.
The small guy was quicker in his payload turn around between runs, but the bigger worker was moving more in one payload.
In an hour or so timeframe, they both moved a equal amount of payload, (small guy, advantage by faster rate (RPM), Big guy, advantage by brute strength (TORQUE), while overall "work" (HP) within same margins, boxes = (TRANSMISSION GEARING)
Yer and smaller guys joins wore out faster from more cycles. Like drag cars
excellent analogy
In my teens I had very muscular legs as a defenceman in hockey. At 6'1" and 200 pounds I was faster than smaller, lighter forwards. My legs cycled slower than the legs of shorter players but I was faster because my strides were longer and more powerful.
@@anascottwelding1761 Indeed! And a GTR engine would not last long in a heavy truck, even with ideal gearing.
Yes, and if these guys had my asshole boss as their boss, he would accuse the large guy of being lazy and not working hard and would pay the smaller guy more money even though both are doing the same amount of Work.
OMG! 67 years old and worked as an automobile mechanic for years... and I finally get it! This was absolutely brilliant. Well done sir.
Me also, at 56
For years = for 0.01 years
Thats horrible.
As someone who’s just learning mechanics, you’ve given me hope. Thank you
This reminds me of those great scientific industrial films from the 1950s, one in particular explains how differential steering works in a car with models, demonstrations, and illustrations.
Also the MST3k shorts with industrial films are a pretty good watch too!
Bet you're thinking of the Chevrolet promo from the 1930s.
I've seen that one too!
I think Ive watched that as well, does it start with something like a cross bar and gradually evolve into a gear used on differentials
U
I can't believe it took me 25 years to finally understand what the difference is only to be enlightened by Lego.
Spectacular video!
Thank You!
I'm 44, and just now learning this, from this video.
@J J Not sure about your wording there. But I know what a 69 is. I've been around.
True enlightenment comes from playing with LEGO...
Would be interesting long stroke versus short stroke, and how power is generated differently. Effect on moving mass, compression, RPM...
That's a good video idea, thank you!
YESSSS this would be great
@@d4a something along that line was in this video (motorcycle engines): ua-cam.com/video/-ooue7i73zo/v-deo.html
I agree that would be a worth while video.
@@d4a yes.. you should whack that topic to your next videos. Since lots people almost failed to understand n comparison between those too. Beside between piston n stroker n crankshaft are well related.
"Newton meters confuse you?"
Me: "No, it is pretty self-explanatory"
"It can be also explained in foot pounds"
Me: "Well now they do"
I felt the same :)
But it is pretty much force lever.
He should have said pounds foot to make it less irritating.
This is also a good explanation ua-cam.com/video/u-MH4sf5xkY/v-deo.html
@@SirGeldi except the ftlbs is literally the name of the measurement and to reverse it would be literally incorrect despite it still making sense
@@andreasfrost-blade4689
Yes, the SAE uses foot pounds.
Torque is a is the vector cross product of distance multiplied by force and cross products are non-transitive.
RxF=-FxR
Why I automatically read this in russian accent
@@andreasfrost-blade4689 the proper name for torque in SAE is pound feet, it is called pound feet to reduce confusion with foot pound which is a unit or energy not torque. But it doesnt really matter because most people say torque in foot pound anyway and the context will tell you whether or not its torque or energy.
"Newton meters confuse you? Let's talk about feet and british money!"
But never forget: with great power comes great responsibility
Brakes! ;)
R u kidding???? Rarely will you witness the responsible use of power!!!!
Even when you're in Park(er)...
Got you, uncle Ben!
Horse responsibility
@@jhuntosgarage who brakes lose 🙁
"May the torque be with you"
-Luke Skyrunner
correction
LUKE SKYROTATOR
@@mallikarjun27 Luke skyliner
so you will keep spinning rather than moving forward.
I'm 56. This is the first time I have understood this difference. Thanks!
In gearhead terms...Horsepower is how fast you can go. Torque is how fast you can go fast.
@@purplemongoose4887 great tip
@@purplemongoose4887 That is wrong.
GREAT explanatory video!
Part of the additional torque of a diesel engine is due to the greater radius of the crank where the large end of connecting rod is exerting force. It's like accelerating a bicycle with longer pedal arms. You will generate more torque at the center axis of the crank using the same "pushing" force against the pedal while using a longer pedal arm (or pedal crank). A greater crank radius will require longer connecting rods because the distance travelled transversely at the big end is greater and you don't want too great an angle between the connecting rod where it meets the bottom of the piston. A larger diameter crank increases the compression ratio which is higher in a diesel engine (usually 14:1 to 25:1) than in a gasoline engine (8:1 to 12:1).
There's plenty more information out there about how diesels differ from gasoline engines.
so that would explain lower rpms i guess....with longer connecting rods, its harder for a big engine to rotate that quickly....granted im in medicine, very little car knowledge
But doesn't it also take more power to over come a longer stroke? A small combustion chamber would fizzle out right? I believe this is the reason why framing nail guns have huge heads versus the small ones on a trim gun
The only correction required here is, that compression ratio is independent of both connecting rod length and crank radius. Its limited/chosen in each type of engine based on many other factors.
The funny thing is that this video finally made it clear, Donut's video only had me confused.
Donut is 70% morons screaming nonsense, 30% content.
@@Rathbone_fan_account nah donut explains for people with more background knowledge
@@waleed172 So true!
Sometimes I had to pause their video to look for the certain example that they are using to explain the main topic.
Donut media videos are for semi-pro people.
Not for the beginners.
well maybe if i SCREAM MY POINT AT YOU YOU'D UNDERSTAND! MORE POWER BABY! lIGHTNING LIGHTNING LIGHTNING! AAAAAAHHHHHHH!
there you go. summed up every doughnut media video that doesn't have Nolan as the main talking head.
@@waleed172 yeah I agree, their videos are entertaining, but it really depends on the person, for me this video made the concept clear, maybe other people understood concept better when they explained it. Not attacking Donut just expressing what I thought.
"Newton meters confuse you?"
"It can be also explained in footballfield cowfarts"
The British use "stones times furlong". However some Americans prefer "ounce times barleycorn"
woa that must be the strngth of like 112 morgan freeman
@@YassineELAZMI 😂😂
You could also simplify it to 43 bald eagles and 8 Donut burgers
@@YassineELAZMI Shut yo face. None of the engines in the world compare to Morgan Freeman. :D
"Newton meters confuse you?"
"Yah most people don't really know how much force a Newton is"
"You can also use foot pounds"
*Confused non-american noises*
A foot is roughly about a third of a meter. A pound is a bit less than half of a kg.
@@___-tp1su it doesn't change the fact that is still a force and a distance so it didn't make anything clearer by changing it. If someone doesn't know that a meter is a distance then they shouldn't be here in the first place don't you think?
@@TheLifeLaVita I don't understand what you're saying, I'm a little confused
@@___-tp1su to make it "easier" to understand, he changed Force and Distance with Force and Distance, so basically changing nothing at all
@@TheLifeLaVita I guess he did it for Americans. The average American probably doesn't know much about metric units
Easily comprehendible, honestly horsepower was one of the concepts that I couldn't wrap my head around. Now am familiar with it I'll have to think about it more but at least I'll know how to think about. Thank you for the video
Left to my own devices I'd have defined 'horsepower' with the actual definition of torque before seeing this video. Sometimes the UA-cam algorithm does good things like feeding my idle curiosity about how stuff works, and now I know better than I did yesterday.
think about weight ratio too. think about gearing that manipulate torque. his other video is good but HP and torque is the hardest to explain. also, not everyone understand it fully - reason i said fully because this is why car manufacture have races and time laps base on certain requirement.
Well yeah, it's hard to wrap your head around PRECISELY because horsepower a useless bullshit metric.
All power is generated in the engine. Measured in torque.
Higher RPM, for any given torque value, gives you more so-called "horsepower". Ok, that's fine, but that's useless information. Because if I want to go faster, I change the gears.
Thus: I'll take the 300ft/lbs 100HP motor over the 100ft/lbs 300hp motor every time.
@@robwoodring9437Yep. Car marketing over the decades has convinced everyone that HP is power. When in fact, it's torque that matters.
The HP number is usually bigger. So they market with it.
@@mustangstuff7213You’ve got it backwards. Gearboxes negate the need for high engine torque, not horsepower. You can use gearing to make the torque to the wheels whatever you want. That won’t change the work the engine is capable of doing.
With gearing appropriate for both and the same car body, a 300hp/100ftlb engine will out accelerate a 100hp/300ftlb every single time and it’s not even close.
This video is pure genius. I've seen so many people having no idea how to make this distinction.
Yet again never disappointed by this guy, so knowledgeable and always makes it easy to understand
This video isn't what i've searched for, i just opened UA-cam and it was here, and since i was very confused on how they acted, i clicked it.
Thanks for the explanation~
Good job adding more confusion. Corrections.
You don't feel the torque in your car, you feel the transition over time. That's power.
Big engines are not used to provide more power, rather reliability and efficency. The gear box is a torque multiplier, at any given speed the power dictates how much torque is at the wheels..
Two motors spinning at the same rpm the one with more torque has more power at THAT rpm. Your two little motors have different power curves.
Now this is supreme education. Should be taught in physics
It is taught in physics 😊
Newtons law of motion
To moowe 160kg takes 160.1 kg
That's why !!! When you (Americans rolig coale)
Figur out that it AIN't the black smoke !!and HP in a DISEL
But the Newton Meters moovin the truck!!
(Funny max DISEL Newton meter is @100/1500RPM dependent on enigen)
Lol, somebody didn't pay attention in school. Yes they teach this in high school physics.
@@kennethschultz6465 What does any of this even mean?
@@kennethschultz6465 it literally is the HP moving the truck. This is proved by the fact that when shifting at peak torque the truck accelerates slower than when shifting at peak HP.
Very simply, I always put it as
Torque = how much weight you can pull
HP= how fast you can pull the weight (or, also, how fast you can accelerate the weight)
I always put it as hp is how fast you hit a wall and torque is how far you push that wall 😂
Personally, I like to think of it as Torque = performance in Gear 1 and at cruising speeds. That's when the engine isn't generating maximum HP and where you'll feel the difference.
Right, because horsepower is force times speed, and torque is essentially force. (Technically, force times distance from the centre of rotation, but the main point here is the force.)
thanks, that is useful
Toque is irrelevant. HP tells you everything. That's the proper explanaition.
Fantastic instructional video!. I'm a mechanical engineer with 20+ yrs professional experience,... And I've never seen a better 'down to earth' explanation of power vs torque. Well done 👍
I think it might be helpful to think about the electrical analogue of Torque and RPM as Voltage and Current, respectively. In both cases the product of the two results in Power. Voltage and Torque are what you need to overcome electrical resistance or mechanical friction, while current and RPM are the time dependent concepts that help you deliver high Power once you overcame the initial barrier. Maybe the analogy would be more accurate when you think about increasing voltage in order to create a dielectric breakdown to get the current flowing. I think this is very similar to using torque to make the wheels start spinning when you have a heavy load or are in a very inclined slope.
Anyone that uses Lego comparisons gets a subscriber from me! Doesn't hurt that you gave a great overview as well. 💯👏
Simp🥱
Siiimp. What does “a great overview” even mean?
45 years ago we had a motorcycle dyno that used a jet engine starter/generator to heat coils, wasting the power as heat. So we got a voltage and amperage reading, multiplied them to get watts, _and then divided by 746 to get horsepower._ We already had the SI unit, but didn't know it, and everyone knows horsepower in the USA.
Respect
Nice video and good explanation, with a couple caveats that I'd like to address:
1. You described HP as the "rate of torque". A more stringent/understandable description is that force/torque performs "work", which is measured in J (Joule). Work is a force applied over a _distance_ ; for example using a force of 50 Nm to push a stone block over a distance of 1 m. The work then equals 50 Nm x 1 m = 50 Joule. In other words work = energy spent (pretty logical, ey?). Furthermore, to lift a certain weight to a certain height requires the same amount of work/energy _no matter_ how quickly it's done. Work is timeless. For example transporting a dragster over a quarter mile - can be done in a month by a LEGO motor or in 4 seconds by a nitro guzzling top fuel engine. The work is the same! However, if you set a time requirement, then we are talking about power; energy delivered _per time unit_ . So if we push that stone 1 m in 1 second we get 50 Nm x 1 m / 1 s = 50 J/s (Joules per second) = 50 W (Watt) = 0,05 kW = 0.068 HP. That's _power_ ! ... i.e. how _fast_ you can get stuff done. How fast you can get that dragster through the quarter mile. How fast you do 0-60 in a 3 tonne car. And that's what you feel, actually.
2. One doesn't "feel" the torque of the engine during acceleration. You feel the force from the seat on your back. The force from your seat is generated by the _power_ of your engine. It doesn't matter if the power comes from a large engine producing 1000 Nm @ 3000 RPM or a small engine producing 200 Nm @ 15000 RPM - _your ass will not know the difference_ !!! To conclude: the torque of the engine has nothing to do with the force which accelerates your car. The source of that feeling is your engine power _transformed into torque_ by your transmission, diff and wheel diameter and then transformed into frictional force by your tyres. The force from the tyres causes the car to accelerate, which in turn pushes you in the back. Now, if _frictional force_ is what is being discussed, then talking about Newton meters is of course highly relevant. But that's not what people talk about when they're bragging to their buddies about the "insane amounts of torque" their V8 is generating... Bragging about torque without regard to RPM is like bragging about RPM without regard to torque (think RC engine @ 30000 RPM - you aren't setting any records with one of those!).
Power (kW) ≈ Torque (Nm) x RPM / 9.55
Power is what you want. You can achieve it by lots of torque (at modest RPM) _or_ lots of RPM (with modest torque). If you have both, then you've got a f*cking boatload.
I love you
like
you definitely feel torque. power is a derived expression. Frankly for a given rpm they are just different expressions of the same thing.
@@TigerDude333 the human body can only "feel" acceleration. Without rpm your body would feel the torque, and with rpm its power.
You're still not really feeling power though, just acceleration.
@@TigerDude333 I don't think you are making yourself very clear. Wish to expand on that so that I can reply? You are talking about engine torque, right? Maybe you misunderstood what I wrote? If you can clearly point out and explain where/how my logic is failing, I am more than glad to discuss it (and perhaps learn something in the process, I see no pride in being right).
What we can agree on (i hope) is that you experience acceleration (and a push in the back). If you trace back from those phenomena you shall see that a ∝ P, which doesn't hold true for torque.
Here's a good example: i.stack.imgur.com/XEH9Z.png
Where's the push in your back (what you feel) the strongest? @ 2000 RPM or @ 5000 RPM? What I said in my above post was that torque is nothing without RPM. That alone should disqualify the argument "torque is what you feel".
Simple and effective way of explaining what is torque, horsepower and the difference between them. And also a plethora of different terminologies along the way. Brilliant! 🙌🏽
Man, I never really totally understood the difference between the two until now. Even after watching many different videos from engineering channels. Thanks!
"You can feel Torque but you can't feel Horsepower"
*Cries in mazda rx-7*
You can feel the fun
is the rx 8 any good
@@aestheticswim3397 good for what?
@@aestheticswim3397 no they went very wrong with the engine with the rx-8 I would recommend staying away from it
🤣🤣🤣
Best Horsepower vs Torque video I've ever seen. Well done
Thank you for the great demonstration. As a motorcycle rider, I hear lots of debates about this topic. One analogy I use, which demonstrates the difference well IMO. An R6 600cc with 40ft lbs of torque at 12,000 rpm, will make the same torque at the back wheel as a R1 1000cc 80 ft lbs of torque at 6,000 rpm, with both bikes traveling at the same speed. This is why HP is important.
Riddle me this. In your example in light of the video definition of HP (torque x RPM), the math on both the R6 and the R1 = 480,000 HP. This obviously is no true. Why? I may be bad at math, but I did use a calculator. Appreciate a response.
@@parsonscarlson7984 to see the math work we would need a dyno which measures torque at the rw in those conditions.
@@parsonscarlson7984Horsepower = Torque x RPM / 5,252
As a former powerlifter, the Eddie Hall image vs the body builder is perfect. The body builder is endurance(horsepower), the powerlifter is explosive short term strength(torque). The body builder cannot deadlift 1000lbs but can deadlift 100lbs for more reps, because of the way each respective man's muscles are trained. Excellent video, thank you.
This is a good explanation. I think the only thing missing is the effect of gear ratios being torque multipliers.
Exactly, you can create double torque just with having speed halving gearing and power stays exactly the same if we just ignorre small gearing losses to simplify things.
@@Karjis I was thinking the same thing. Using gear ratios to reduce the rpm at the tire (using a vehicle as an example) you can get the same amount of torque applied to the ground as a much larger engine.
@@kevinbuhler8776 An even better example is a bicycle. You can see the transmission (it's called a cassette), so it's a great way to understand gear ratios. In a lower gear, the gear size is bigger. One turn of the pedals might make gear 1 make one rotation. Gear 1 is terrible for speed, but it's great for power, such as just starting off, or going up a hill. Compare that, to say, gear 7 (I'm using that because it's my bike's highest gear). Gear 7 is visibly smaller, and makes many rotations with one turn of the pedals. It's great for cruising along in a straight line fast. But you'll terribly hurt your knees if you don't move to a lower gear if you need to go slower, or if you're going up a hill. In fact, for anyone who's interested in learning to drive a manual car, I would recommend to them that they first play around with the gears on a bike. It makes learning to drive stick much easier, because they will better understand the concept of low versus high gears.
@@hamsterama Brilliant
Yep, on max power RPM and at full throttle, with proper transmission gearing,
more max hp =
more tq at the wheels,
only horsepower number matters.
I have watched numerous videos explaining horsepower and torque. I kind-of got it. After this video, I completely understand. All of the videos, including this one, have the same information. It is just how it is explained. Thank you again D4A!
Thanks!
I think it's also worth pointing out that gearing can be used to compensate for a lack of torque. That is to say that, theoretically, two cars with vastly different torque, but the same horsepower, could accelerate/pull with the same force if the gear ratios are scaled. For this reason, you can roughly compare how two vehicles of similar weight can accelerate based on horsepower alone (e.g., mustangs and camaros with equivalent transmissions have nearly identical acceleration times with very different torque, but nearly identical horsepower). I say theoretically because the engine with more torque will probably have heavier engine and transmission components, more inertia, etc., and will be slower to rev up with no load. Add in that the shape of the power curves, gearing, drive line losses, etc. will probably not perfectly line up, and you get a bit of a mess.
Now, another benefit of using horsepower as a metric is it tells you when, for any given car, you should be shifting to achieve maximum acceleration. And that moment occurs when the power at a given RPM is equal to what power will be at the new RPM after completion of the shift (assuming of course that you do not get valve float first 👀, in which case, that's when you want to shift lol).
This video only refers to torque at the crank, which is simplified for the general audience. A sports car can have a high revving engine, which enables higher gear ratios, which multiply the torque, so there is more torque at the wheels than at the crank.
@@Obi-WanKannabis Yeah. I wish people wouldn't try to make that simplification. A person isn't really understanding what power is in a vehicle until they see that it isn't altered by the choice of gear, while torque and rpm are altered dramatically and inversely. Then you see that at every speed, power is related directly to thrust (unless there is a burning smell;)
@@Obi-WanKannabis All cars have more torque at the wheels than at the crank.
@@drienkm I will also note that as the car accelerates it shifts into higher gears so the propuslive force from the wheels is less, but since the velocity is higher the horsepower remains the same
@@forloop7713 Yes, but gear ratios multiply it differently, if your car revs to 9000 rpm you're going to multiply that torque more than if it revs to 6000.
6:20 When a car accelerates there is no force pushing you into the the seat, but there is a force pushing the seat into you. The car is being forced to accelerate, but the passengers (as independent, relatively stationary masses with respect to the car) just happen to be in the way as the car is pushing against them.
From our perspective it feels like we're being "pushed into the seat" but if you think about it, it makes sense that the car is actually pushing against you, because the engine also needs to accelerate you to the speed of the car and all of its components.
Pretty sure both are happening.
To out pedant you- it depends on your reference frame. Both are ultimately correct and identical.
for every applied force, there is an equal reaction in the opposite direction
technically gravity is pushing you into the seat, but to out pedant myself apparently gravity isn't an actual force. So there's that I guess.
@@Obi-WanKannabis Well thanks to inertia you want to follow the straight line in space-time which would bring you into the seat and curving towards the center of earths gravity. It's the normal force from the seat that constantly pushes you off that path.
I barely comment on videos but here I’m compelled to express how amazing this explanation is. Unbelievably detailed and yet understandable. Can’t wait until my kid is old enough to watch this and more of your videos 👍🏾
Excellent video! The key is, as you noted several times, that HP is energy (as force)applied over time. A low amount of force applied rapidly can represent a lot of power. Torque is force applied over distance (arm) independent of time. Two different animals.
"You can feel Torque but you can't feel Horsepower"
*But it's VTEC yooo*
I don't agree with him on that. You can only feel horse power. You have to apply torque over time to feel it. We can't experience things in infinity small amounts of time. It's like saying you can eat a cheese burger without the cheese. It's not a cheese burger till you have both.
@@pleasedontwatchthese9593 horsepower isn't an observable force like torque. It's a measurement of work done. You feel force, not work. It's like saying you can feel time passing. That kick you feel when you step on the gas is the difference in velocity between you and the car as the structure of those 2 things isn't rigid, but independent. It's applied torque.
"You can feel torque but you can't feel horsepower"
Horses worldwide would like to disagree
@@cIappo896 Actually its applied force, waht you feel. Tourque is actually the same thing as Energy. How much force is being experienced depends on the length of the lever that applies the force. Lets got talking about transmissions.
In First gear a gear connected to your engine will spin another very big gear. the Force applied near to the inside of the Gear gets applied to the outside of the other gear.
If these two gears fight against each other the Smaller gear would have an advantage because moving a long lever requires less force than moving a small lever. You just need a long arm or walk in order to spin a little wheel in any meaningful way with a very long lever. If your lever was shorter you wouldnt have to move as much, but you'd need to apply more force to get the same amount of tourque.
Shifting upwards into second gear will put your small gear against a not as big gear. The 2nd gear will spin faster due to its smaller size since you can move lets say 100 teeth/s because it has less teeth than the first gear. But the lever isnt as long anymore so it doesnt have as big of a tourque advantage anymore compared to what it had in the first gear. Thats why you have less acceleration in higher and higher gears. You might have a higher top speed but you cant accelerate as fast in higher gears anymore. If you'd made the engine spin faster however at some point it will fly apart, which is why there are rev limiters so they can prevent this flying apart part.
Your theoretical top speed is only determained by three factors:
Transmission length (longer transmission = more top speed; less acceleration), max RPM (higher max RPM = more top speed; more power; more acceleration; less durable) and wheel size (larger radius = more top speed; less acceleration).
The FORCE applied to the ground depends on what transmission length you have and how much tourque your engine produces. If the force stopping you from going faster (such as wind force or just friction in general) is greater than the force you apply, you can no longer accelerate. Mass is not directly a factor - but mass does affect friction but also increases grip, which increases applyable tourque - so mass cancels out - downforce through a spoiler doesnt - thats why racecars use wings instead of extra mass). Mass does not influence your top speed if your tourque is always as much as physicall possible (so much that your wheels dont start to do a burnout).
A burnout means that the force applied is bigger than the applyable force for the grip you have. The friction which is supposed to help you propell is being overcome, this causing your wheels to spin without your car getting accelerated.
You do not feel the tourque. You only feel the force. Force is whatever is at some point by the lever.
You can feel it very easily by using a nutcracker. Cracking the nut with your bare hands is rather difficult - for some even impossible. Put it into the nutcracker, grab it by the ends of the two levers and push the levers together. Quite easy if you ask me. The force applied by your hands is exactly the same. The force, which cracked the nut was a lot bigger. Depending on the lever length.
If the lever was lets say 6 units long and the crack chamber was 1 unit away from the spin center, the force experienced was multiplied by 6/1, which is 6.
So if you applied lets say 6Nm of tourque you applied that because you applied 1N of force on a 6m lever. 1*6=6. The Nut experienced 6N because the same tourque applies to all levers 6Nm of tourque means 6N of force at 1m distance from center. It would have felt 24N at 25cm from the center and so on.
Meaning:
If you had a REALLY long lever you could make the earth stop spinning when you stand at a solid location, which is not attatched to earth. The lever just needs to be able to carry out this much force down on earth because theres gonna be a lot of force. So good luck building that lever.
@@cIappo896 Time is how you use torque. It's not like its left out, its just part of a bigger picture.
It might have been worth mentioning that the torque generated by the truck engine is not only due to larger cylinder volume and piston diameter resulting in greater reciprocal force through combustion but equally important is the greater distance of the crank throw from the point of rotation creating a leverage effect for that force to act upon.
It would have tied nicely into your example of torque measurement using the 1 metre lever bar on the bolt with the applied force.
Another wrinkle with Diesel engines is that the fuel itself contains more energy than gasoline.
A second difference to consider is that gasoline is more explosive, whereas diesel burns and becomes more explosive under pressure. When detonation occurs, gasoline goes out with a bang. Detonation with a Diesel engine is a slower explosion which pushes on the piston longer than a gasoline detonation. This is also a contributing factor for why Diesel engines generate more torque than an equivalent gasoline engine. It is also a reason why Diesel engines don’t rev as high as gasoline engines, the slower burn creates a cap on how high your engine revs can be before your engine would outrun the combustion process.
@@nathanwieling7943 what is the advantage of gasoline then?
@@krys8494 Gasoline detonates faster for higher performance applications. Costs less to produce since compressions ratios (air to fuel mixture) are lower than Diesel engines so the engine and its operating parts doesn’t have to be built as heavy duty.
@UCLK3WKx3l3Mod5fV-RqenGA my dad had an Ford F700 with a small block gas engine in it years ago. It was slow and and a turtle could out accelerate it!
To some extent what you are saying is true about torque, especially when you can add gear reduction, but gear reduction adds weight and complexity which can be a drawback when a diesel can do it better if designed for the specific application. What this boils down to is we need different designs for different applications because a one size fits all approach doesn’t work. Maybe think of horsepower as how eager an engine is to work, and torque is how hard it can work. I could hook up a 30,000 lbs trailer to a truck with 1,000 hp and 500 ft lbs of torque and even though that engine is very eager to rev and accelerate, that 30,000 lbs will temper that eagerness quite a lot. However, a truck with a diesel that has 1,000 ft lbs and 400 hp will have no problem carting that 30,000 lb trailer around and up hills.
This is a better explanation than the video. Thank you.
Good video! But just a small note: the larger torque of the truck engine compared to the car engine, does not in itself explain why it's more suitable for heavy vehicles.
Because the usefulness of the torque is always the resulting power. If you have the same power at a certain speed the torque does not matter. The reason that the small car engine is not as suitable to run a truck(despite it can can have the same or higher maximum power) is that the average power through the rpm is lower.
The small engine could run the truck, but it would require more number of gears to be practical.
And if you use a variator, torque does not matter at all: a low torque then in any moment can be compensated with higher rpm.
Apart from that, another reason to use large engines to heavy vehicles is of course the lifetime and intervall of service. A car engine would probably break more or less regularly by the strain of pulling such a heavy loads constantly at high rpm.
At least someone understands it. I think it's pretty important if not the most important, and nobofy ever mentions it. Torque, by itself, is pretty much irrelevant. Any engine can produce any torque through set of gears.
@@AndreiSZS thats torque at the wheels. The engine is still only producing a certain amount of torque and gears can multiply that to an extent but there’s still a limit to the amount you can do that. But ultimately it is the torque at the wheels that will give you acceleration
@@racdude01 Engine torque is irrelevant. Any engine can produce any torque.
@@racdude01 can you provide any formula that features both torque and acceleration?
@@AndreiSZS engine torque is very relevant when calculating horsepower. And yes technically you could build any size engine to achieve any specified amount of torque though it wouldn’t always be practical as a small engine will need to rev at a very high rpm to produce large amounts of torque whereas a large engine will rev much lower to produce that same torque. This also means the small engine will produce more horsepower than the large engine if max torque output is the same. If both engines were installed in the same size vehicle the small engine would achieve a higher top speed and the larger engine would likely accelerate faster. Unless you geared each car differently to compensate
Nice explanation, but I think what most people are confused about is not the difference between power and torque, but why torque in a car engine matters at all if there is a gear box available. A small powerful engine with initially small torque will provide a larger torque than a less powerful large engine with initially larger torque given a proper gear ratio. However, it will come at the cost of much higher rpm which reduces efficiency. A high torque number pretty much indicates that the vehicle is designed to be efficient when pulling heavy loads at relatively low speeds.
Took me 30 years but now I got it. Thanks
so what si a horsepower ?
I can't believe how simplified and understandable this explanation is. Well doned
Sorry I meant 'can't '
this video beats all traditional educational movies by a landslide.
Frankly speaking, this is one of the best physics videos I’ve seen in nearly 30 years. I’ve always been apprehensive about topics like this and circular motion, but this video 🎥 transformed my perspective and dispelled my fears. Even though I’m in medicine, not engineering, it blew my mind 🤯. Why don’t our teachers teach like this? I think some might be in the wrong profession; they teach because they feel they have no other options 🤷. I love learning new things every day, and today, this was a remarkable lesson 📚🌟.
Torque at the wheels are important for acceleration, you simply need F (force). F=m*a
Using gears you can change the amount of force (torque) applied to the wheels, but you won’t change the hp output at the wheels. More torque, but less frequent, lineair relationship!
Pull away in 1st gear: goes pretty fast with any car (wheel spin=maximum force you can apply!). But acceleration becomes worse while shifting up, in any car. Only those with huge amounts of torque quickly accelerate in high gear, but still slower than in lower gear.
Side note: torque and power curves drop above a certain rpm, mostly because of a combination of starvation (can’t pump enough air in through the inlets), resistance (pump out exhaust gasses, mechanical friction), valves that can’t cope with the quick opening and closing, and simply too high forces on crankshaft and pistons which will make the engine disintegrate. Otherwise, more rpm would result in more hp.
What about some cars where the hp curve keep going up till redline?
@@maddeningmonk9585 good engineering to get around the listed issues with running at high rpm, see : double overhead cams/4 valve cylinders well ported heads higher conpression etc. A well engineered engine can maintain its torque at very high rpms, just look a formula 1.
Or just lower the redline lol
@@benfennell6842 i mean some cars for example make peak power at 6500rpm and peak torque at 2000rpm. Their power curve will keep in climbing till the red line. The torque will gradually decline but the power will keep on increasing till redline. I'm talking about normal everyday Street cars and not f1 or other vehicles. I don't want to call f1 cars because they ugly as fuck
@@maddeningmonk9585 lol
So basically, a gearbox is a device to control how much torque is being output by the driveshaft.
Yes, half true. a gearbox is also needed to spin the wheels slower or faster than the engine speed.
Since the engine has a maximum power (torque x speed) the gearbox can increase torque by sacrificing wheel speed (HIGH TORQUE x low speed) or,
increase wheel speed by sacrificing torque (low torque x HIGH SPEED)
@@spamtes yes that's what I meant, just did not elaborate enough. Thank you for the completion.
@@spamtes So theoretically you could use the GTR engine in a truck (since it has actually more horsepower at 7k rpm), but you would have to have a transmission decrease the rotations dramatically to get the same (or higher) torque as the truck? Could you also do the inverse and use the truck engine in the car and have the transmission speed up the rotations and with that decrease torque?
@@EndstyleGG Sort of. If both engines had constant horsepower then you would be right, since lowering RPM would necessarily increase torque. In reality, torque and horsepower are dependent on RPM (search for engine power curve or torque curve) and throttle, so the figures which are usually shown for engines are peak torque and peak horsepower at full throttle. Also, if you're searching for these curves and happen to find both for a same engine, notice how peak power doesn't occur at the same RPM as peak torque (usually).
@@EndstyleGG look up truck racing.
I've learned so much from this channel, thank you sincerely.
Amazing, thank you. Just two more facts based on your video that comes to my head: 1) You can rise torque of any motor by gearbox, but you cant easily change its powe output (HP or kW), it remains the same. 2) Newtonmeters can be also roughly explained as 1Nm is 0,1Kg on 1m long lever.
Possibly the best explanation ever. Excellent work as always 👍
Cycling uphill, if your legs can exert enough energy to go up a steep angle, thus your legs have a high amount of torque to push yourself up even though you are pedalling slowly.
Cycling downhill, if your legs can cycle fast enough to accelerate down a steep angle, thus your legs were able to generate a high amount of horsepower due to your speed of pedalling, even though each time you pedal requires way lesser torque than when you're cycling uphill.
Say what now?
"newton meters confuse you? no problem, torque is also can be easily expressed in foot pounds..."
that is the best laughter i had for a while, i was so unprepared for it.
Thanks for the DEFINITIVE video on this difference. Absolute gem!
When he started explaining horsepower and saying "the key word being..." my dumb ass went "aha! HORSE!"
Same, I thought he was going to explain why it's called horsepower lol.
Me to wife: - See, honey? Larger isn't always better...
larger but flabby isn't good. smaller but hard as rock is good. and if possible, LARGER YET HARDER IS BETTER.
Tell it to your Postman :)
@@randomnickify oof
Dude I really hate sports cars, I love those heavy trucks ad coach buses.
HAHAHAHA SMOL!
I’ve had a tough time understanding these concepts for a long time a thin cleared it up for me. Thank you!
And he got it wrong. You do not feel the torque. If the engine doesn't move it doesn't matter how much torque it's producing. It's producing NO power.
With the smaller motor you can apply a gear to make them turn at the same rate. What number tells you the force after gearing.. THE HP NUMBER.
The work done is what you feel. If you have your finger directly to the shaft you're feeling the POWER of the magnetic forces.
Indeed, an excellent presentation of the subject. At long last I can see the exact difference between the two.
Hi, engineer here. Good explanation but there's a couple of misleading points.
1. You can't spin both electric motors freely and claim that the small motor rotates twice as fast, thus can have 1/4 the torque but only 1/2 the hp. At peak rpm as shown in 5:16, the torque is effectively 0. This is true because if torque is > 0, the shafts will continue to accelerate. The rough calculations were close because the ratio of rpm at peak torque between the 2 motors is about the same as the ratio of peak rpm between them.
2. 6:25 - 6:35 you mentioned that torque can be felt but not horsepower. While this is true, it may mislead people into thinking that acceleration depends on torque and not horsepower. Let's talk about 2 hypothetical engines, A and B. A has high hp low torque. B has high torque low hp. Torque at the wheels is what matters and A can be geared down to produce more torque than B at any specific speed.
Put the sports car engine in the truck with a custom gearbox (or a perfect CVT) and it will accelerate the truck faster than with a truck engine. The real reason why trucks need high torque engines is for fuel efficiency and reliability. You can't redline a high hp low torque engine for 12 hours everyday.
Thanks. I was about to write this. Glad I scrolled down. Saved me the time.
I was about to write the same thing! Don’t want to red line anything.
I don't think you can gear down a VR38 to match the truck engine's torque figures. Displacement is what generates the torque, which you need to move 20 tons.
You're basically saying torque is only down to the horsepower x the gearbox/drivetrain it's matched with. That's essentially BHP.
@@HipsterNgariman nope. the gearbox can change and multiply the torque easily to the torque of the truck. 500Nm to 2500Nm is just a factor of 5. No prob. Thats what a gearbox is for..
The displacement gives you the torque at the crankshaft..the gearbox will give you the torque at the wheels..and thats the only thing you really need!
@@floridrummer88 don't forget, that factor of 5 works both ways, more output torque but also more input RPMs.
In other words, if the input is already over 2,000 RPMs you will destroy that engine getting that torque number while maintaining the same output RPMs.
Cool video, but also a bit of a missed opportunity.
Saying that "truck engines need more torque to pull greater weights" confuses the issue rather than explains it. They don't need greater torque, the whole thing could be accomplished with the right gearing by a bike engine of the same power. The point with the truck engines is that they can run at much lower rpm, which is good for fuel efficiency and wear.
There could have been another 10 minutes of the video where you attach gears to both motors and show how this manipulates the torque and the speed. Then you could put the motors in a lego car and show how acceleration and top speed are affected when different gearing is used. That, I think, would be most enlightening. Maybe part 2? ;)
As a new subscriber; I'm absolutely impressed with how the graphics along the explanation bring everything together, which makes everything so understandable! Almost like a magic trick, it's easy when you know how it's done....I'm hooked on your vids.
Good explanation. Really, the whole thing could be summarised as "power = torque times rpm". The confusion comes from the words being used lazily or inaccurately by the biking community (I'm a biker) and (I guess) the car community. You hear all this stuff about "power is how fast you hit the wall and torque is how far you move the wall" which is unhelpful. A vehicle can deploy the same amount of power with low torque at high revs, or high toque at low revs. Power dictates how fast the vehicle will go, allowing for weight, friction, air resistance, etc. because it is work done in a given period of time. The torque could theoretically be measured at any rotating axis from the crank shaft, through the gearbox input shaft, gearbox output shaft, and as far as the driven wheel. If (for simplicity) you ignore losses through friction, at any one of these places, the torque may be different, but torque x revs will equal the same amount of power. In real life, you can't ignore losses through friction. That is why you can't go to the absurd and use a 1 rpm engine with an enormous gear ratio to get high speed, or a 20,000 rpm bike engine geared down ridiculously to pull a truck.
Agreed. And follow up video he published week after that was about how many comments had the variation of "wall definition".
Honestly, this is an absolutely fantastic learning tool. Well done sir, well done.
Something important about the difference between sports and heavy duty engines.
The real reason big machines need torquey motors is because they need to use all their horsepower all the time.
A crankshaft bearing, camshaft, or cylinder wall can only take so many rotations before things wear out, so machines that need to work all day want to keep their rpms low if they are going to last. The only way to make horsepower at low rpm is by having torque.
Fundamentally though, a gtr with the right gearbox could tow a semi trailer faster than that semi can, it will just wear out sooner.
no, it wont. it wont have enough torque to move the semi. unless it went to 100k revs, which obviously it cant.
Another factor to consider is efficiency. An engines brake specific fuel consumption is very high at high rpms. This because of the rich air/fuel mixtures and high friction losses that occur at high rpms and high loads. ICEs are generally most efficient at around 1500-2500 rpm (this can vary depending on the engine) at high loads. Sports car owners don’t really care about fuel economy but truck drivers who travel hundreds of miles everyday do care. Because diesel engines make so much toque, they can make a lot of horsepower at the low rpms it has where BSFC is at its lowest.
I liked this very much. One thing that might confuse people that i saw, because it confused me for a moment... is that the lower hp motor spins faster than the higher hp motor. Maybe it was just me! Thanks for the content!
Same
I think I get the gist......he didn't come out & say it but your answer is implied in the description of sports car motor vs. truck motor. The reason that one motor spins faster than the other is not just "cuz they were designed to". They have different intended purposes, yes, but the designers have only two numbers they can manipulate. If you need max HP, you gotta make torque & RPM work together. If you need more torque, you'll be limited in your max RPM and HP. You want more of one thing? It'll cost ya some of the other, cuz, natural laws and all that.......nothing is created or destroyed, but merely transformed.
Yeah describing RPM as a separate factor helped a lot
Video got me more confused with the little motor with less horsepower spinning faster 😅. Like a GTR 500hp vs 1200hp Bugatti with higher tourqe.
@Sean Payton I appreciate you taking the time to explain.
I have never found a better UA-cam channel than this.
Another very well explained topic in that video, most people describing that doesn't manage to put it that precise (or the blatantly forget about the power per time thing for the HrsPrs..) . Thank you very much and now stow your Lego's away safely before you step on em!!! :| We need you making new videos with intact feet!
I hate how nobody stresses that horsepower is the only unit that matters in a vehicle. Higher torque vehicles produce more power at a lower rpm. Theoretically you can tow with that GTR engine but it is impractical due to the fact that you'd sit at 6000 rpm constantly. It's like when turbine engines were becoming popular, they were out producing power-wise and were better in every way except noise and fuel consumption.
For the majority people this is true if you want a fast daily driver, however if you tow anything knowing the torque can be just as important as to know the efficiency of that engine; I'd rather have a vehicle sit at 2000rpms rather than on redline going down the highway with a trailer hooked up to me
The only time high horse power is relevant is for track/drag racing or if your lucky enough to have roads with no speed limits, but for everyday driving about the streets/highways having a high horse power car is pointless, you would need to be driving around doing 100mph+ to actually use all the power available, at least with diesels you get to play with all the power as most fade off around 100mph-ish and driving faster than that on public roads is a bit stupid and doing more than a 100mph here in the uk is usually an automatic ban if caught, high horse powered cars are the same as high end PCs, pointless if you can't use it to its full potential.
you're not very bright are you?
Low RPM high Torque figures are only relevant in towing because you are producing more Power at Lower RPM which is more efficient in that use case due to all sorts of factors including angular velocities, clutches, fuel consumption, reliability, rotational and dynamic mass etc.
Truck engines have to be strong due to the forces required in order to move large masses therefore it isn't reliable to use a lightweight sports car engine that revs high due to its lightweight components (not as strong) in order to produce its Power Output thus transferring huge angular velocities into the drive train to move huge masses at lower speeds, it doesn't make sense. Higher torque values at lower RPMs can make daily driving regular vehicles easier due to not having to rev the engine for Power however Torque values are meaningless unless the RPM at which the Torque is produced at is explicitly stated otherwise it is a utterly meaningless value and you may aswell just state the Power figure at that given RPM anyway because that is more meaningful since to understand the Work Done you have to do the calculation of Torque x RPM/5252 and hey you get Power. Furthermore engine torque is meaningless to the consumer because what is produced goes through a gearbox so your wheel torque is totally different to your engine torque. Torque is only important to a tuner or an engineer to determine the strength or the required strength of components, otherwise all the consumer is interested in is the power at a given RPM. YOU CANNOT FEEL TORQUE IN A CAR ONLY POWER/WORK DONE.
The best analogy I can personally come up with and is relevant to this is if you tighten a bolt to 60Nm with a torque wrench then try to loosen it at 30Nm you get 0RPM therefore 0 work is done, the Bolt goes nowhere, you cannot feel any acceleration force because there is none.
To conclude Torque is meaningless without RPM in vehicle performance and with RPM you are left with Power (don't confuse with peak power) which is the only meaningful value. I'm a mechanical engineer and I hope this helps
@@rosskj9187 shhhhh no one is reading that
I've always wondered what's the difference but no video made me really understand better than your way. It was clear, educating and easy to get. Thank you
I’ve seen over10000 videos about explaining torque and horsepower, this is first one to make me fully understand🙏
Also you should add that HP is far more important than torque because you can always get more torque through gearing, but you can never get more HP
Another important thing too - torque isn't constant over the rpm range of an engine. It will have a point where it creates it's maximum torque then starts dropping. Having peak torque at low rpm means you'll have more power available at very very low speeds where you can't shift into a gear lower than 1. The engine will have lower overall power than an engine with the same max torque that occurs at a higher rpm though, since power is torque * rpm.
A sports car with 400hp and 250 lbft of torque can pull a trailer faster up a hill than a truck can, but the truck with 300hp and 250lbft has more power at 1000 rpm to start pulling it up a hill if there's a stop.
@@jimomega381 I'm giving peak power and peak torque figures
Is that why trains, semi trucks, diesel pickups, and electric vehicles have superior torque? You cant replicate the towing capacity of a high torque power source with simple gearing. Both horsepower and torque are important but in the realm of hauling cargo torque is more important. The same theory can be applied to power and air tools. A simple drill can be good for tapping holes and securing bolts and screws when there is little resistance. Whenever there is any resistance an impact gun with superior torque is used.
thats what i am saying in a lot of discussions and people who dont have a clue will always start to rage about torque beeing important. Then you tell them that more torque at the same rpm means more horsepower and they seem to never come back again.
@@belowpovertylineminority Why do such a long text just to tell you didn't understand anything at all about the video, or things in general? Small vehicles won't make as good towing equipment as heavier, because the towing force limit is set by weight on wheels. As for using impact guns, those are used because the counter forces from the rapid impulses are absorbed by impact gun inertia. A really high torque applications (like Hytorc) uses pure torque and need to be anchored in place, it would braid arm bones together in an instant if held by hand.
Remember when you times torque with speed, you get horsepower. When you times horsepower with time, you get work done.
Torque is identical to work. Torque is telling you how much work is done in 1 radian of rotation (the amount of work done in 1 rotation is 2*pi*torque).
RPM is frequency, so it's the inverse of time. Multiplying by rpm is equivalent to dividing by time.
He left off another constant from the formula HP=(TQxRPM)/5252
@@SpencerPPyne And do you know why that constant of 5,252 is needed?
@@madmandan1982 if memory serves it is the RPM at which torque and horsepower intersect
@@shadowboy813 if torque is not great enough to overcome resistance, no work will be done. Work is torque times rotation angle. Work is also a force times distance. If you apply force to push an object but it won't move, you make no work.
I think an FBI agent was listening to my brain cause I silently thought about this while at the doctors today
I hope you are alright
They laugh at me for wearing a camo ballcap.
But at least i'm trying to hide my thoughts ...
@@fjb4932 lol its 2021 the Internet knows u better than u urself
U dont even have to think it automaticly knews what fits when to u
@FJ B 😂😂
Do tell....
Excellent video.
I have had a lot of motorcycles all different sizes and this explains the sensation of going from a 600cc bike that can do 160mph to a 1200cc which can only do 120mph, but feels much more powerful. I can pull away in 2nd gear no problem and go fast with low RPM and not worry about changing gears so much. The 600cc bike red lined at 14k RPM but you needed high revs to get any sort of power out of it because at low RPM it was gutless.
Great video, but I think that you should have at least mentioned how gear ratios relate to this topic.
i agree. i have a 1999 gt mustang and the torque increase you feel with 4.10 gears is phenomenal. gearing is seriously an underrated way to increase power in a car/truck
One thing I can say is that 4L in SUVs is the maximum torque put to the wheels, and I dare anyone to stop a vehicle in this mode
I love this video, but I think one thing is always overlooked: ft-lbs is work or energy, or it can be a moment about an axis, i.e. a static force. Torque, a movement force involving rotation, should be represented by lb-ft (or lbs-ft) per SAE.
I'm not that familiar with the imperial system, but that's a bit confusing 😅
Great explanation, you have been able to give a very concise and clear explanation of a parameter which frequently confused both the amateur motor enthusiasts and professional mechanics alike. 👍👍
Thanks for a easy to understand illustration of the difference between HP and Torque. However, I know what a pound is as it applys to foot pounds, but what is a Newton. The only one's I'm familiar with come in a pack and in different flavors; fig being the original and today, blueberry and strawberry. I think it would help other viewers too since most torque wrenches read both.
By definition "Newton" is a unit of force that would accelerate 1kg mass by 1m/s^2. Once you have that force in mind if you apply it over the lever that is 1 meter long to rotate something you get 1 Nm. Given that on earth gravity gives objects downward acceleration of 9.81 m/s^2, you can multiply your mass in kilograms by that number (sometimes rounded to 10 in less rigorous scenarios) to find how much force in Newtons your body exerts over Earth surface.
Still not understanding how the smaller motor has greater RPM than the large one. If the larger motor produces more torque, why does it not have greater RPM? I would think it would have a greater rate of force application as a result. What am I not getting?
This video, as most videos about torque, is actually a bit misleading. Torque and Power are in direct relationship with each other. The reason why the bigger engine doesn't have that more power is because its torque decreases as higher RPM (dropping earlier and quicker than on the smaller engine) the metrics given at the beginning of the video are PEAK values. For electric engines that is usually at or near 0 RPM for torque, and as high RPM as it goes for power. At the same RPM, power and torque are always in the same ratio to each other. Power = Torque x RPM.
@@Willyfisch okay but torque decreases at higher RPM for the small motor as well, so why it has greater RPM?
@@szymoniak75 For the exact reasons WHY this specific motor has a flatter torque curve than the smaller one, you'll have to open it up and see. Probably it's either because the larger motor has a stronger magnetic field that gets saturated more quickly or most likely it has to do with higher back EMF (Electromotive Force) of the bigger engine. It has to do how electric engines work and requires more explanation than would fit in a comment.
The important part to understand is that the bigger engine in this case loses more torque at higher RPM than the smaller one, which is not mentioned in the video.
@@Willyfisch ahh yeah maybe back EMF you're right
Best explanation of torque and horsepower I've seen ever
Truck engines are also designed to produce MUCH higher low end torque. Another reason that they spin so slowly is because of higher efficiency and much higher reliability
Yup, that's why sometimes engine with large displacement can be actually more efficient than the small displacement engine with the similar power output because the main factor of that is that at which rpm the peak power or torque is generated, if you have an engine with 500HP generated at 7 to 8k RPM, it could be less efficient than another engine with the same horsepower but the peak power or torque is generated at a significantly lower RPM (but this can be wrong too because determining how efficient the engine cannot be done that easily because there are many factors that can determine how efficient an engine is)
Lower RPM also due to higher reciplicating masses
@@FrankTheile correct, but otherwise, lower reciprocating mass means it's able to Rev higher, that's why most of the motorbike engines are having oversquared design which means the stroke is very short and the bore is larger (you can imagine a bore size of 60 to 90mm with a relatively short stroke of 45 to 50mm) whilst trucks and buses engines are the opposite, they have a really long stroke but smaller bore size due to stroke being so much longer than the bore size itself
@@FrankTheile yeah
this actually really helped not just explain torque but why small engines can get such high rmp's that equal trucks
-22 “Low outside temperature” now that’s an understatement!! Great video 👍🏼
You see its really cold outside when even your car is complainting
"Does Newtonmeter confuse you? Here's the same in Imperial measurements, because that's always better."
If the pound*foot is too small or too huge for you, you can easily convert it to the ounce*inch or stone*mile
Noooo, metric is always better. And more precise.
@@pietjepuk6372 imperial is actually absolutely metric.
And thats why imperial slowly going to change to metric.
In this case I think Foot Pounds is a better measurement because a pound of force is something very easy to contextualize. Newtons not so much. KG/Meter would have made more sense to me.
That was incredible - thank you for posting. I love Eddie Hall in there - im a big strongman fan.
Holy shit. You actually did it. I GET IT NOW
Torque is torque, but horsepower is how quickly that torque is applied.
On a dyno, you get a torque graph,which peaks in the 2-3k range and then tails off. BUT, despite having less torque at high end, that lesser amount of torque _is applied more rapidly,_ thus higher HP in high rev range. Wow!
I genuinely thought intuitive HP calculatuons would stay a mystery for me, thank you mate love ur channel
So in a race car, you can compensate for low torque with shorter gearing if you have high horsepower
yeah but you'd be slow as fuck
Yes, and if you have a high-torque, low-horsepower race car, there's nothing you can do about it. The cars with the horsepower will blow your doors off.
No, power is the important figure. The only reason why trucks have big engines is that a small engine won't last even 10000km at its max power.
@@comet.x Come on man. Use your brain. HP is the determining factor (torque X rpm).
@@NAmania if you drop the rpm, but raise the torque (exactly what happens on a super short gear) the wheels don't spin very fast. Which means the car does not go very fast
One of the key things I got from this was:
“Eddie Hall is a truck.”
🤣
0:12 homie said "I guarantee..." and actually meant it. You're an absolute legend!