What is a horsepower? | Know it All with Jason Cammisa | Ep. 06
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- Опубліковано 12 вер 2024
- Many cars come with two different horsepower ratings, and that's because there are two measures of horsepower: Imperial Horsepower (hp or bhp) and Metric Horsepower (PS, CV, PK, etc.)
Power is a measure of how quickly work can be done, and horsepower is no different. Imperial (US/SAE) horsepower is defined as 550 ft-lbf/s, where Metric (European/DIN) horsepower is defined as 75 kgf-m/s.
They're similar, but it turns out European horses are only 0.986 times as strong as American ones.
Of course, horsepower is an outdated unit, replaced by watts. 1 hp = 745.7 watts; 1 PS = 735.5 watt - and of course all electric motors are already rated in thousands of watts, or kW.
But that's far less sexy, isn't it?
Watts may move a car, but horsepower sells it.
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Horsepower Graphic, thank you Wikipedia.
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![The Porsche Carrera GT is fine. Until it’s not. - Spotlight feat. Jason Cammisa - Ep. 7 [UHD 4K]](/img/n.gif)
This dude is a pretty damn sharp car journalist.
If I recall he has college degrees in engineering and German, and a absurd amount of knowledge, tar the smoking tire podcast he is just absurd
yeah, he should do a podcast or something
@@davidpistek6241 And a fricking law degree to boot!
@@junaideej.k7634 Look up the Carmudgeon show here on YT, its his brilliant regular podcast.
A rabbit hole I fell deep in.
This format is unbelievably fun and informative
I’m glad someone said it. This what UA-cam use to be!
@@kmoss9521 now it is full of people revealing the fact that it has been snowing lately and their tires are pretty worn out...or, alternatively, asking you to guess what car they have brought with *your money* or, even more alternatively, telling people that the hood of that GR86 is not a GR86 and could be something else, some secret project... when, in fact, even my mother could have recognize that it was exactly identical to a BRZ's hood, bar the badge.
The funny thing is, people, instead of taxing them or reporting them for fake content, they keep watching their junk content.
Our luck is that on UA-cam, you can still find some quality content. On something like tiktok, it is zero value content, presented as the best thing since bottled water.
No special effects, no fancy editing, just pure talent.
The aussies are ahead, they measure cars in KW for a long time now.
Yeah but they still quote horsepower alongside it because people like the sound of it. I remember when FPV proudly announced one of their XR6T models as having 432 horsepower.
Yeah, also TV sizes are in centimeters... I agree that som measurements make sense in imperial when less precision is required, like inches for wheels and screens etc. However it's still weird that tires are in millimeters. At least having one measurement system within the same component/system would reduce some confusion.
@@cjansson Cross-ply tyres are measured in inches, radials had to be metricated to avoid confusion, even in America.
As for tellies, I bought mine specifically because it was advertised as "55 inches", have no clue what that is in cm.
@J B tires are weird though because height is usually inches and width is mm... think 345 wide tires but they are on 20 inch rims?
Oh and off road tires are 35s or 37s? I will never understand
Most of Europe also requires kW alongside the (optional) PS. People are used to the latter so it's what advertised. To add to confusion it doesn't say PS but is instead translated into local languages. Incidentally where I'm from this translates into KM. And of course we also use km for kilometer. Fun!
Fine. I'll look up the kW - HP conversion myself.
1hp = 745W;
1kW = 1.35hp.
@@mindkiller76
1kW = 1.34102209hp (Imperial)
1kW = 1.3596216173hp (Metric)
1kW = 1.3404825737hp (Electric)
3/4 (75%) for a rough calc
100hp = 75kW
Freaking brilliant... Finally FINALLY someone explained it in a way I could understand it.
Exactly! If I'd had this guy as a science teacher, I'd likely have passed!
😅😂😂😂
Funny and knowledgeable, I love that
Well done
He is underrated... when Jason Cammisa, Pobst and Throttle House Connected it was like a Fast and Furious family gathering
You need to come out more with these episodes more ofter....seriously!
Weirdly enough, EV manufacturers, even the new ones like Lucid, Tesla etc use horsepower on their websites, not kilowatts. Deiter isn't going anywhere, I guess.
In the UK, all car mags refer to EV power with horses. Possibly to make it easier to compare to the 320d you were going to buy?
@@pigeonpoo1823 Exactly. It is all for comparison sake. Units don't really matter as long as you can compare one to the other without the annoyance of conversion.
They have show horsepower otherwise it is hard for the average consumer to compare their cars to others, but I agree that all car companies should rate their cars in kilowatts alongside horsepower.
Except in Australia, where power for cars is in kW *at the wheels*, even for non-EVs.
In the EU all cars sold have their power rated in kilowatts (for both EVs and other powertrains). I believe this is by law. They also usually have the power rated in horsepower within parentheses, but I don't think that's required.
Please pay this crew more and more so we never have to stop enjoying ourselves! Jason is great and the production/ writing is top notch. Thanks for this channel
Jason Camissa is the single best person I can imagine doing this. You’re an absolute joy to watch mister!
Cammisa is awesome! But, James May would do a good job explaining it.
@JasonCammisa So happy to see you teamed up with Hagerty... reminds me of MT before Discovery got involved and everything started becoming so watered down. It seems you’ve found a team that ‘gets it’ and understands a lot of the benefits of UA-cam content creation. The production value is outstanding and I can’t wait to see where you guys go from here! Happy for you man, keep up the good work.
Just an FYO, he is NOT reading your comment, or anyone else's for that matter.
@@ACommenterOnUA-cam he has replied to a lot of comments on several videos. I think it's safe to say that Jason does read the comments.
@@nhatminhang6969 ah NOPE ... not any of the videos that i have watched and replied to no. Even the one that i called him out and said it was a bold face lie, NO reply.
So maybe he does reply to other people that i have yet to see. But from my view, nothing
@@nhatminhang6969 well people have died from covid per the "news" yet NOBODY i work with or any of my customers or family members know anyone that has died from covid ...
You say he reads and replies, i have yet to see it. Same difference
What i like about using horsepower is that knowing peak power and torque tells me something about an engine. For example, if an engine makes 500 lb ft of torque but only 250 hp then I know that it's a monster up to like 2500 hundred rpm but then dies like it's been shot in the back. LIkewise if an engine only makes 150 lb ft of torque but has 300 hp I know that it has a high redline and that you'll have to use it to go fast. Because 5252 is always the denominator once I have the power and torque figures I will always have an idea about how an engine does above and below that line.
Yeah, we've towed Boeings around with engines that output 140HP and 270 ft*lbs. A 140 HP engine that outputs 80 ft*lbs isn't towing much bigger than a Malibu Barbie trailer.
Slight correction, work isn’t measured in torque it is measured in torque times the number of revolutions. Otherwise a really informative and entertaining video as always, keep it up Jason!
I assumed this would be the top comment. As a pedantic nerd, I twitched when he said torque is work and immediately came to the comments to be sure it had been dealt with.
The important distinction between force and work is that force can be applied against something that doesn't move. If it doesn't move, no work is being done. This is why we think of low rpm torque when towing because the higher force needed to move a static heavy object is one of the key attributes of a tow vehicle.
Sometimes people confuse torque for work because of the units (pound-foot, newton-meter, stone-horse, etc) since they involve a distance (which is just the lever arm length, not an indication of work), but I think Jason simply mis-spoke here.
@@EUC-lid If we're really being pedantic nerds, torque and work both come in units of force*distance, but work is a scalar while torque is a vector.
This is hands down the best auto / tech series i've seen, really nice work Jason & team!
Cammisa is the best gift ever to the world of automotive nerdery.
Knowledge, style, timing, I admire what you all have done here.
Excellent video. There is of course a better unit: the Hairdryer (HD). Conversion is easy: first convert your car's HP into watts, then check your wife's hair dryer (or your own, I don't judge) for wattage, then divide the car's power with the hairdryer's power and now you have your car's power in HDs. I'm sure this will catch on and people will stop looking at me funny.
Oh cool I thought you could only calculate that for miatas.
that Roma in the back is the best spec I've seen so far
FACTS.
To clarify at 3:23 a "modern" turbocharged car will be quicker around town, not the old school turbo which has lag for days.But damn the amount of knowledge this guy has.
Well, not ALL old turbo cars had bad lag. The Buick Grand National had max torque at 2400. 355lb @ 2400rpm, for 1986, was pretty impressive.
@@TechnoLawyer Good to know. I'm outside the US and so we never got those.
Are you guys sure about the tazing part? I was under the impression that this was the work a horse was regularly expected to produce in a steady state. I'd imagine a tazed horse could easily produce 15-20+ horsepower in that first second. 150lb Cycling sprinters make 2+ horsepower for like 30-45 seconds at the end of a 200 mile race. Ya'll selling the poor horse short.
I think it can be asserted that James Watt was not in the posession of the technology to make a tazer, much less a hand held one he could or would use on a horse. (or he would have ended like the guy in the video who tried to hit the horse...)
Yeh, it was a horse working all day at that rate. Just like you'd be able to work harder in brief spurts if your life depended on it, vs. slogging through an 8-hr day, so can a horse easily make far more than 1HP in maximal exertion (IIRC, around a dozen HP peak).
A strong man can output 1HP briefly. (Like a weightlifter benching 275#, two feet upwards.)
Loving these vids!
If this guy were the teacher in every class in America we would be excelling in academics. The way he explains stuff is top notch.
Hyphen’s 500e looking good in the background
*E 500
P.S. Sorry to be that guy
Would look better with Hyphen in the background
Wait'll you see it in all its glory next week!
I'd rather see a hymen in the foreground 😃
A charming guy, Jason Cammisa. The platform is also very entertaining.
this series is awesome
jason cammisa is an actual gift to this world
Cammisa is the best car journalist.
It was James Watt that quantified the parameters of a horsepower. An entertaining explanation 👍🏻.
Keep up the great material Jason!
As a diesel engine application engineer, that is my everyday talk, well done!
I have one complaint and that is the lack of actual cold start footage from some epic engines. My favorite is a ford small block. Thanks for the awesome content.
Oh, some countries do measure electrical appliances with HP. Air conditioners are sometimes rated in sizes like 1 HP, 1.5H, 2 HP, etc..
We need more of these videos
How do I LIKE this before watching? Oh, yeah JC’s on the thumbnail!
Adam Sandler never fails to make us giggle.
One horse is actually capable of 14.9 horsepower at peak and humans can be capable of about 5 horsepower.
Actually, how I know the story of the horsepower is that, the average weight of a human (male) is 75Kg. So, a horse, carrying an average rider (75Kg) on it's back can jump as high as 1m in the air and it would take 1 sec. to do so. That's how it was decided on the 75Kg-1m- high-in -1 sec. part of the definition of a horsepower. Not sure if it's actually so, but that's the story I've heard.
Very informative, thank you.
Thanks again for the great video.JDS in AZ usa Jason love your videos.
I never learned that much while laughing. 🤣
Haha I have an uncle Dieter and we are a German family , 100% sending this off to him.
I'm impressed by your pronounciation of "Pferdestärke"
He does such a good job explaining things
JC Thursdays are the best
A two-horsepower stereo used for an extended time may cause deafness.
Well done! That horse kick was awesome!
Thier are 3 horsepower ratings a engine gets
1. Gross HP: the HP that an engine produces with only the accessories needed to run, no emission equipment, measured at the rear of the crank.
Has been incorrectly interchanged with SAE HP/BHP/PS/Kw 😔
2. SAE HP/BHP/PS/Kw: the power that an engine produces with all accessories, all emission equipment, with an OEM intake/exhaust system for that vehicle at the rear of the crank.
Has been incorrectly stated, even currently😔 that SAE HP has a artificially higher HP rating vs BHP, including North American market only vehicles(or Gray Market imported vehicles), even though sense 2006 SAE HP rated engines have had all accessories on the engine. I am not including vehicles that have been altered for different emission/sound decibel/exhaust route changes(what side of the road you drive on) on non North American market vehicles.
3. Wheel(Real) Horse Powers. Includes transmission, diferential(s), wheels/tires , mabye a transfer case, mabye cvj's and mabye a driveshaft(s).
I love learning new car stuff! And I love your jacket,
I hate it when people say "oh That's the torque is kicking in". Torque is ALWAYS kicking in. Power is ALWAYS kicking in.
Very informative and awesome video. Thanks Wish Adam Sandler.
As a kid I always pictured horsepower in my head as a car being pulled by 300 horses, a real big cloud of dust and clopping hooves as they trip over each other and create general mayhem everywhere I would drive, just like today.
Australia has used kW for cars for some time. It's the only time that Aussies have been ahead of the game.
Jason is a LEGEND!!!
You need to change to Metric measurement for lenght and to German PS (HP) for power.
Japan,UK and US,use BHP. But the other use HP (PS)
Imperial:
1mile = 1760yard = 5280foot = 63360inches
Metric:
1km = 1000m = 100,000cm = 1,000,000mm
Temperature: where's water start to be ice
Fahrenheit 32°F
Celsius 0°
Discount Adam Sandler schooling us again. Love it.
Love these videos, although the gifs seem superflous, a Ram TRX owner dropping a rock on a bystander is funny enough on its own
Camissa: "A turbo charger provides the biggest benefit at low rpm."
Porsche 930 in the background: "Uuuuuuhmmmm ... NOPE!"
My two favorite things, cars and MR. Ed
Braking power is also rated in Kilowatts
The all time greatest truck EVER, which is the M35A Deuce and a half military 2,5 ton 6X6 truck, has brakes that generate 12KW of power (16 HP) with a GVWR of under 26,001 pounds this allows the M35 to be driven with the need of a CDL.
12 kW sounds a bit low, even if it were per brake.
If you take out the air resistance i would say, it still takes the truck longer to reach its highest speed than to brake to a standstill from it's highest speed. So it should generate more braking power than engine power. Wikipedia states the engine to have 95kW...Or were the brakes in the 40's that bad?
A typical hairdryer is 2 horsepower as it is rated at about 1500 watts ( i watt is 1volt × 1amp) 746 Watts = 1 HP. Work and Torque are defined as ( force) ×( distance) power as ( work / time) and Energy as power × time. If a car ran at 300hp for one hour that is energy . Kiliwatt × hours is how the power companies charge you . A horsepower hour . 1 hp for one hour or 746 kiliwatt hrs
A lot of automotive engines (especially in Europe) are rated in kilowatts. Aside from the Koenigsegg, which is rated in megawatts.
Well considering most household microwaves are around 800W, they have slightly more than 1HP (= ~746W). Also maybe it was just here, but we used to classify AC by their HP, we now use BTU's.
Well, because for A/C HP is how much power they draw, and BTUs are how much cooling they provide. Makes more sense to use the latter, because the former makes no accounting for efficiency.
Does anyone ever wonder if they kill the battery on those cars always behind him with the lights on?🤔😂😂
Good video as always 👌
Some hybrids are awesome, or they can be made awesome!
Love our Camry
We measure lightbulbs in lumen, which is related to the light of a candle.
I had to subscribe after watching this video.
Damn, that's a kickass jacket
In Australia we use kilowatts for power and newton-metres for torque. Horses are still cool though.
liked , subscribed . perfect
This is so good
I like your videos and most of the time I tend to agree wirh you, but please allow me to disagree with you on one aspect: kW vs HP.
In some countries the power of the car is actually given in kW in all specs and brochures. This is because it is a scientific unit (SI): W (Watt).
For those who don’t know - and there are those… - 1 kW (kilowatt) is the same as 1000 W (watts), but it would be silly to say that my car generates 150000 Watts. Instead we say it generates 150kW. I know… school stuff, but you’ll be surprised how many people skipped this lesson at school :)
Horse power is not a scientific unit but it is quoted everywhere because it looks better. Regardless of whether it is EU or USA or Japan, the horse power figure is always higher and looks better for the marketing guys, so its easier to sell.
These videos should play at the beginning of every other car channel
He is awesome, haggerty is winning theese days with Jason and matt
I appreciate this videos a lot.
I really appreciate these
That’s why the Aussies speak in Kilowatt and Newton Meter. Though when they say it makes 100Kw and it’s a supercharged Holden. That’s like you said about the TRX. The measurements should be equal to what you’re measuring. Kilowatts for EV HP/PS for combustion.
Bravo!
Watt actually measured the power produced by ponys pulling loads up from mines. He then assumed a horse should produce 50% more.
And this is the very roughly estimated power these animals can produce continuously over a day shift without keeling over. A horse can actually produce over 15 horsepower in short bursts. A human in good shape can also produce over 1 horsepower in short bursts.
My main problem with HP is that it wildly underestimates the wattage of a horse. I believe (with no citations) that it is because they used mining ponies for the test. Given the right equipment (a bicycle) I can produce almost 2 HP very briefly. Top level riders can produce 1/2 to 2/3 of a HP for an hour. Racing driver (and Olympian) Sir Chris Hoy could produce around 3.33 HP when accelerating on his bike.
I doubt anyone would argue that I am more powerful than a horse. Let alone 2.
And just for you true geeks... using the same level of hand wavy math as Jason did to explain why HP=(TQ*RPM)/5252, a quarter horse running flat out up a 2% grade is producing over a horsepower.
4:08 Brazil making appearance in this video. The crashed car is a VW virtus or voyage, both cars are very similar in design.
His style is very informative and funny 🐴😂
Cammisa! love the series!
It's important to note where the power is measured, hp versus bhp.
Excellent explanation. Force x Speed = Power
Love this guy.
Love Jason
The actual engine output measurement I WANT to see is the integral of horsepower between the RPM the engine drops to after a redline upshift, and redline.
The edit is hilarious 😂
Loved all the visual aides. Hilarious
Huh.... I hated them lol.
Maybe I'm just getting old
Yes, using the kilowatts for measuring power is much more suiting with switching on electric power.
Also, when is the review of the Roma coming out?
Right ... kilowatt is energy burned off by electrons flowing thru the conductor. Not an engines rotating force.
@@ACommenterOnUA-cam No, but it's more constant measure than the power of a single horse. Do you think that all horses have same power?
@@Cane306 my comment remains as a FACT ...
Finally a new video 🔥
Great 👍
His Producer really liked watching Alton Brown & Good Eats. lol
Horsepower exists and is basically how fast the engine can accelerate to it's redline, simple as that. That is why a car with more HP than a different car will accelerate faster. And in drag racing, two cars can cross the finish line with similar ETs but one car might have a higher trap speed which would indicate that it had more HP than the other car where the other car would have a higher torque engine and it made up the difference in ET through gearing.
Of course HP is calculated using torque into the equation but lets say an engine's max HP is at 8000 RPMs. The torque rating at that engine speed is probably going to be a little less than it was at 4000 RPMs but if you say an engine makes, let's say 200 lb-ft of torque at 8000 RPMs, all that is telling you is that the engine can twist something at 200 lb-ft at 8000 RPMs but it's not telling you how fast the engine accelerated to redline because in most cases, an engine will still create HP as torque starts to drop off.
Jason, what did you do to the stig? I saw his helmet in the background and i am now concerned!
same thing with electronics. I have a 2000 watt blender and it's 1amp. it's like a 1000hp MX5
Gotta love it
Same horsepower doesn’t mean same speed, only if cdx is the same, so.... 200 HP in two cars with different cdx will results in two different maximum speed , also we should consider the ratio gear, but the concept is: the power it is used to move the car that is affect by the internal friction and the most important to flow around the air, assuming the same horsepower and the same internal friction the car with the lower cdx will be the faster, hope is clear
Love it