SOHC vs DOHC | Autotechlabs
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- Опубліковано 28 вер 2024
- If you are an automotive enthusiast, then you might have heard the terms SOHC and DOHC at some point. This presentation demonstrates the difference between both these engine head configurations and their working principles. Hoping you could learn something from our presentation, please like and subscribe!
Animation + explanation = perfection.
A simple explanation can only be done by someone who understands deeply the subject. Amazing videos
You don't really understand something unless you can explain it to your grandmother.
@@mauj.2409😮
Keep going please, we need to learn things
Ryan Nugroho. 💪😎👍..
Yup
Library?
True.
😊👻
My god, what a quality of presentation:
-simple:
-interpretative;
-informative;
Great job, with presentations like this, going to school is more drying than normal.
But the info is mostly wrong. Clear, but dead wrong.
test drove a 2014 chevy 2500 (sohc), 2007 tundra 4.7 v8 (dohc), ram 2500 (ohv, single ohc), 2009 frontier v6 (dohc). Now i live where there is atleast 4 miles of steep uphill its a huge test to show what your vehicle is made of. You can see and feel the difference of a dohc made vehicle, managed to keep a steady 75 mph from leveled road all throughout the end of the top uphill with one engine shift at 2-3.5 rpms (for the dohc trucks). The single cam ohvs blow these trucks out of the water in terms of power but my mph went from 75 mph (leveled road) scaled down to barely 60, 2 quarters near half way the uphill at the same 2-3 rpms. Real world performance to suit your needs. Listen, well made is better than the numbers in the stat sheet. Get a dohc vehicle especially if you travel to work in mountainous areas, long uphills. From what I've seen new or old the v4 cars end up blowing their transmissions its just a nasty uphill go v6 if u cant afford a v8. Obviously get the 2500 trucks if your towing or dumping heavy material.
In summary:
SOHC: you want a car to drive normally and economic. (Daily drive)
DOHC: you want POWAAA (for racing fans)
bouaaaah
No my sohc is a beast
@@josephrebensdorf9844 yea, for drag racing
well not really, dohc gets implemented to all modern engines now even economy daily driver cars gets dohc
@@josephrebensdorf9844 and cheaper to maintain.
Please keep posting, I’ve learnt so much thank you, you’re a blessing
Anyone else here because you are studying for the military asvab’s auto & shop portion of the test? Lol 👍 keep it up soldier, you will make it one day, Under God ofcourse ❤
If you keep this channel going you have guaranteed subs
NOTHING to say keep it up.... ♥️plz make a video about Automobile Engineering ❤️👍
I honestly curious about my motorcycles engine since it was bought at 2011 and its a 150cc engine with DOHC config and just now i know how DOHC engine works 😂 This video is great! The explanation is easy to understand for people that didn't know shit about engine (like me) . Keep up the good work!
Good explanation; thanks! I'm trying to design a steam engine and it's been a real uphill battle! :-)
Awesome video, I understood basic concept, thank you
FANTASTIC VIDEO! MANY MANY THANKS.
Nicely made, but lot of generalisation. The examples shown include direct-acting follower v plain follower v roller follower, as well as varying numbers of valves...and hydraulic v mechanical lash-adjustment, whereas these features are largely independant of the number of overhead camshafts. Look at the valvetrains of a few car and motorcycles engines from the 60's through to today and there are examples of most combinations. Some of the of the pro's and con's listed are more closely linked to the follower design.
There are always variations on a theme. The Kawasaki Z-1 had DOHC and 2 valves/cyl. The Jaguar V-12 has SOHC and no rocker arms. The Suzuki GSXR series had DOHC with rocker arms.
Hey dad, the UA-camr you subscribed when you were still a kid just uploaded a new vid after all these years!
Muy buen video, explicación muy clara!!
I’ve got a Audi 80 coupe DOHC 16v is it good?
Please keep on going this is awesome some problems why only 7 videos we need at lest 20
Wow class presentation..
I just noticed that SOHC is actually better for my driving habit. My car normally runs below 5000 RPM where SOHC produces more HP and torque than DOHC. Thanks for sharing the info!
DOHC provides greater performance from my experience
Superb explanation! Thankyou, visuals were amazing💘🔥🔥🤝👏👏
Welcome back sir
Congratulations
What a great explanation
learning in simplest form. Thank U
Sohc have rocker arm,rocker arm shaft...while dohc only have camshaft. Which is less component?
what about 'murican OHV tech?
Sir, what software do you use to create such as amazing technical animation???
Request VVT for nxt vid
Yamaha r15 v3 got sohc engine setup but got vva technology can u explain how
Good video thanks a lot 👍👍👍👍👍👍
There are a ton of economy engines which are SOHC and do not use any rocker arms at all (using a simple shim-over-bucket system), usually having the sparkplug mount at the side of the two (most of those engines are 2v per cilinder) valves.
The video says that DOHC always has dual INDEPENDENT camshafts, but that again isn't true. Toyota 4AFE, some Honda engines, and Fiat's FIRE 16v engines are DOHC with non-independent intake camshafts.
There are also engines that are DOHC but do use rocker arms instead of shim-over-bucket or shim-under-bucket designs.
There’s actually a lot wrong here , the spring is to seat the valve , there is 0 transfer bk to the lobes when seated , that’s what clearance is for
I think you should have a look at Honda SOHC engines...
We miss you so much we need you to teach us
What about cam-in-block or OHV (overhead valve) engines?
I LOVE THIS. THANK YOU!!!!!!!!!
Hey which software editing you are using? Keen to check that
I love the m113 sohc engine
great guy for sharing, i await for your next clip
They need to bring back the 20 valve configuration to all cars
EXCELLENT! ❤
Respect for springs
Imagine have long stroke and sohc. It will be very efficient
SOHC diesel engine in my car has great acceleration around 800-2500 rpm
U got a cruze by chance?
@@chevy2061 it's a mitsubishi adventure
more moving parts(twin cam) doubles the chance of failure. My rb30e single cam, has a crow cam in it which you should already what that does. Add oversize valves and you don't need twins. Look up VL GOD
awesome, please continue with new videos :)
Perfect 👍
Wow amazing keep it up 😍
Now Yamaha made a SOHC engine which has 4 valves, 12000RPM redline, VVA (Similar to VVT), Fuel efficient, Excellent High and Low end torque. All these in a 155cc engine. Welcome to R15 v3, MT-15.
Thanks
Scotty kilmer next video "Why not to buy SOHC and DOHC" lol just kidding.
Go for QOHC. V engines with 4 cams haha
But I still don't get why SOHC produces less power than DOHC??
Douglas Healy also, how do sohc produce low end torque?
Honda used sohc while toyota and other manufacturer used dohc
@@JohnKickboxing Basically like they said; SOHC are usually fitted with less valves per cylinder due space constraints. It's not really due to having 2 cams instead of one, it's more of a side effect thing. Another example: a DOHC car almost always have the spark plug right in the center of the cylinder for better an more uniform combustion and that simply isn't possible on SOHC unless they offset the camshaft and use longer rocker arms on one side. @Burcey B That once again has mainly to do with with valve count and lift which effects performance. Usually on low rpm you actually want a slight vaccum to occur because you won't be using all the air that is coming into the cylinder anyways. You will be compressing air that in turn will not be used up in the combustion event (3rd stroke) with the fuel therefore you are losing power (torque). This is all compromise game. You give away something to gain something. Of course that VVT and other systems reduce this compromise and pretty much give you the best of both worlds but at an increased cost and complexity.
"Since the mass of the valve train is lesser in such a configuration" should not be followed with "SOHC engines tend to produce more torque toward low to mid RPM and provide improved fuel efficiency"
Total non sequitur.
SOHC has higher valve train mass than DOHC (on a per valve basis, and that is what matters). SOHC has far less than pushrod engines. If you are going to compare to pushrods, SOHC are capable much higher maximum RPMs and tend to make most of their power at higher RPMs.
Dual Overhead "This configuration has a better valve lift resulting in improved airflow through the combustion chamber" Almost completely false. And again, compared to what? The primary advantage of direct actuation as shown is even further reduction of valve train mass. This allows (again) for higher operating RPM.
The primary reason for going to a four valve engine is to REDUCE valve lift. Valve flow at their perimeter, not across their area. Two small valves have more perimeter than 1 larger valve.
Also , there are DOHC engines with 2 valves per cylinder, old Alfa Romeos for example .Better performance in the low to middle RPMs range of two valves engines is because of the larger squish / quench area in the combustion chamber which is impossible to be replicated in four valves chambers . The larger squish area generate strong turbulence even from very low RPMs and this lead to faster completion of air/ fuel mixture burning. DOHC on two valves chambers allows for precisely adjusting and varying of valves overlap which is impossible with SOHC .
Poor video on the subject overall!
Absolutely amazing videos. Makes want to lear more about cars. And I never was a "car guy". Please make some more 🙂
Great graphics. One significant advantage of SOHC motors is that it is usually much easier and less time consuming to check and set valve clearances. DOHC motors require shims to set valve clearances and much more time is required to get at them. However, valve clearances in DOHC motors stay set for a longer time than in SOHC motors.
That hasn’t been an issue for a very long time. Basically all engines have had hydraulically adjusted lifters for decades.
@@the8419 Not on motorbikes.
@@the8419 Direct impingement systems like the DOHC configuration shown in the video cannot use hydraulic adjustment. I've owned 3 different cars with DOHC and they all used shims for valve adjustment.
Beautifully done. I'm so happy to be learning how engines work. I've been wanting to know for a long time. This makes it all so clear!
Thanks for the information, i'm currently educating myself as a mechanic even tho i have multiple books and websites i really find all of your videos great for applying the information with cool and accurate animation of the internal and external workings of the things you teach :) keep going man this is great learning material both for those hobbyists, students and educated mechanics who need to be refreshed in their info :)
Pfft. Pushrod is where it's at.
Hi, welcome back after long period
Here some suggestions:
- vvt
- turbocharging Vs. supercharging
- wet brackes Vs. pads brakes
Thnx in advance
The wet brake vs pads bakes is an interestering one which could be nice to see :) Great suggestion
Keep going. You have great diagrams and the new voice is great
You only made 7 videos in the past 5 years damn u should upload more often I enjoy ur explanations 🤠
@Gibbon when life was better 😕
If they would have taught this in high school instead of some other bs classes I would have actually applied myself and not skip with some bimboes and get my off campus pass revoked 😢
Very good, great animation.
A couple of things, a number of SOHC engines were 4 valve per cylinder, examples being the Honda J series, Chrysler EGJ and offspring, Nissan KA24E and several more. A number of DOHC engines do use rockers, so there are exceptions to the rules, but as a general explanation this video is great.
Came here to make the same comment, also a number of SOHC Engines featured VVT like some honda engines and Mitsubishi's 4g69 Mivec engine. But yeah great explanation and animations.
@@jake.g1 An excellent point, one I had forgotten
Exactly! My imported 1990 Accord 2.0si exclusive coupe came with a F20A DOHC and it had rockers and 4 valves then i swapped over my ported and cammed superior flowing 4 valve SOHC F22A head just because stupid people think 2 cams gives them twice the power of a SOHC haha!
Mitsubishi 6a13 engine uses a SOHC valve design while having 4 valves per cylinder
@@remi009340maybe not twice the power, but definitely more power...
Current industrial competence allow production of four valves per cylinder configuration. Haven't heard about 1995 D15b Honda engine? 4 cylinder, 20 valves sohc 3-strp VTEC - only one intake valve opens till 3000rpm, than second intake valve start working till 5500. And after that high lobe of intake side starts working. Look for cam for yourself - 5 lobes per cylinder
You just gonna come back and pretend you haven't uploaded for 2 years?
Sweet 😎 Thanks for the education
😁
@@autotechlabs wouldn't a 4 valve sohc be more complex than the 4 valve dohc since roller rocker arms are more complex than the plain bucket tappet cam followers on your example? What advantage would an sohc design provide in that situation then?
Also, wouldn't an sohc head have better valve lift (leading to better flow and higher power) due to having the leverage advantage of rocker arm ratio vs. bucket tappet dohc cam followers on your example? To increase the valve lift on that dohc example you'd need bigger cam lobes than normal while the sohc can simply have the same cam lobes but have higher ratio rocker arms.
Also, it would seem that the valvetrain inertia on the sohc is greater than the bucket tappet dohc on your example, which would then cause to the dohc to have better low-end torque due to less power used to operate valves (assuming that valve lift, duration, and intake runner design are the same)? Unless of course a single bucket tappet is actually heavier than a single roller rocker arm assembly.
I am genuinely curious what the advantage of a dohc is over an sohc on a non-VVT application. Obviously a dohc has better options on VVT by simply having cam phasers on each cam lobe, providing independent VVT between both intake and exhaust valves. independent VVT on an sohc's intake and exhaust valves would need more than just 2 phasers since you can on out 1 phaser on a cam directly. I've searched high and low and never got a definitive answer.
Sohc = initial to midranges
Dohc= better top end
can i ask something? why if the profile cam built as same as DOHC in SOHC?? same engine same bore diameter and same stroke... same valve diameter and same 4valve... but in sohc... will it same power and torque??
And I, as a buyer, prefer SOHC. but they are no longer made
they got banned from NASCAR for being too good :D
Cam on bucket design, as shown in your DOHC animation is the other way around valve lift wise.
Cam on bucket is limited to the cam lobe lift, where as rocker arm designes (DOHC, SOHC & push rod) have lift mutiplication based on the arm rario, allowing greater vavle lift & more flow.
Right. It depends on the design.
5.4 2v on 9 thread heads 2.3 vmp gen 3R on adapter plated gt500 lighting intake and fuck the world sohc for the win
Very good video, congratulations!
I love how UA-cam recommends things I don't need to know but need to know! Thank you UA-cam Thank you @autotechlabs
Great animations, great explanation. Thanks for the video. And please don't be gone for another 2 years.
I ❤ Honda SOHC 16 valve. Those were bullet proof engines.
The f22 and f23 as long as you keep oil in em they'll keep on chugging along
SOHC still can have 4 valves with just 2 arms that connect to the roller tho, just a tad bit different than showed 4 valves SOHC here
My 2010 F-150 Single Cab/Short Bed truck have a 4.6 2v SOHC engine...the best truck I've ever had with that engine...
Great videos 👍 it would be great to see some more videos come out Hopefully Soon !
great content please continue uploading more ! Thanks
How about SOHC VTEC (Honda) and SOHC VVA (Yamaha) ? Both operating well in 4 valve / cylinder
Keep on doing such beautiful videos & don’t worry about people complaining about the computerised voices, we can learn a lot & understand so well how seperate system works... Please do a video when you start the car (insert the key & switch on the engine how it works) to have a complete clear picture, then teach us how each system works like you’ll did the video for breaking & cooling system
can you please give us a video on how the oil works in an engine
What a marvelous presentation, I've never seen a simplicity like that.
My channel guys
sohc makes sense for smaller/fuel efficent cars
dohc makes sense for sporty cars
DOHC simply better
@@abdulabdanahib9617 its not „that simple“ for manufacturers. when you have a small city car you wont need dohc. saves money and more torque at the low end. you wont rev a smart till 5k rpm in the city do you?
from my perspective, SOHC simple, easier to work on and small valve head along with less maintenance required, downsides makes shit power
DOHC, better power although larger valve head and harder to work on along with usually needing better oil change intervals to function without issues and more expensive as they are usually chain driven
OHV ftw.
You should make a video on how we can get rich so we can buy Faster Engines!! 🐹
🤣🤣
Thing that need t be specified.
SOHC isn't limited to rocker arms in 2 valve configuration.
Which also removes "no ideal spark plug space" issue.
DASOHC-Direct Actuation SOHC is literally taking one cam and valve config From DOHC but cam is SOHC aka 2 valves don't do the same job and open at the same time.
As such the can be placed at angles like DOHC ,allowing for spark plug to be placed as desired.
Pros:
Even less weight,
Allows for " ideal Spark plug placement"
DISCLAIMER Its not a thing people I'm being ironic you don't drive F1 cars You drive consumer cars(even in Ferrari's) such matters are easily resolved by Reshaping the piston face and head cavity, and even than minuscule to the point of insignificance compared to cost of redesigning EVERYTHING in the Engine head.
Cons:
supports only 2 valve configuration.
no "Ideal spark plug placing" Actually old side plugs are significantly easier to replace.
Maintenance is complicated compared to SOHC rocker config. It requires change of parts (shims) to spec tolerances instead of simple Screw adjustment. As such is susceptible to ANY loose tolerances be it actuation point or bearings. Shims cant be always found in exact spec which also means more special tools to grind them.
DOHC can also be in 2 and 3 Valve spec.
Reason why you would want that is advanced economy trough technology such as Variable Valve Timing.
SOHC has fixed valve timing due to correlation of valve timings is tied trough a solid Steel shaft.
I'm a huge fan of dual overhead cams pushing four valves per cylinder. Gives the engine designer lots of flexibility in head design, but body guys don't like the "bulky" packaging of the heads for todays "aerodynamic" (they REALLY AREN'T) jelly bean cars. DOHC's can push SIX valves per cylinder easily too for even better engine breathing= more HP =better fuel economy. Honda even made an "oval pistoned" engine with EIGHT valves per cylinder for motorcycle racing that showed promise with carbs and should have ran away with fuel injection (not legal yet). The "old" internal combustion engine has a lot more life in it and development in it than Tesla would have us believe.
This is also an excellent example of the difference between the Mercedes M113 and M156 AMG engines. Both absolutely phenomenal engines, but slightly different flavors 😉
Your torque curve is BS. The cylinders don't care what opens the valves or how much hardware there is doing it, the cylinders only care how far the valves open and for how long. Therefore how the valves open has nothing to do with horsepower or torque. Look back at your first animation of SOHC vs DOHC. In the SOHC you have rocker arms which add mass and complexity but allow for magnification of lift so the valves can open farther than the heights of the lobes. This will provide more horsepower. The DOHC configuration has cam lobes acting directly on valve stems or buckets which limits valve lift and limits horsepower. And both of these configurations limit placement of valves, the valves can't be canted forwards or backwards. OHC systems do have less mass of pieces involved and therefore can more easily achieve high rpm which does provide more performance potential over a traditional OHV configuration. But OHC systems have more pieces, require a more complicated drive system to turn the cams, and make the engine wider and bulkier. With traditional OHV systems an engine of high displacement can be made relatively small and compact.
2:05. "Due to the reduced counter parts, the design complexity and manufacturing costs is comparatively low for SOHC engines. Since the mass of the valve train is lesser..." As professional as this video appears, I don't believe it's accurate. Reduced counter parts? The SOHC design requires rockers. Rockers are moving parts that require energy to move them. The design also requires rocker shafts. The DOHC design requires only an additional cam. No rockers. No rocker shafts. The mass of the valve train is lesser? I disagree. 3:18. "This configuration (DOHC) has a better valve lift..." Again, I disagree. During engine development, by moving the fulcrum of the rockers, the geometry of the rockers can be designed so they produce more radical valve lift.
As a Auto Technician, Removing a SOHC Cylinder Head not as Timing Consuming or Complicated, vs the DOHC Heads theirs more to it , Cams & Journals remove it just to Access the Head Bolts,
Well this topic is outdated and irrelevant now. You can't still make SOHC engines and produce enough power. I don't know about other manufacturers but Toyota stopped making SOHC engines about a quarter century ago.
This is the reason why I love this Channel . All the video are well explained and good presentation that make us understand easily. Thank for providing a valuable video and please keep doing this.
from all I've know from being part of street racing community, they all said DOHC have more kicks but require/ate more fuel
I should say that SOHC does not necessarily have rocker arms. Soem SOHC heads, like Peugeot's XU7, do not have rocker arms.
I have two scooter Burgman Dohc and second Yamaha Sohc , Burgman is more powerful and better pickup with more consumption of fuel then Yamaha
tqvm for this excellent video.
if the timing chain malfunction, SOHC would not cost pistons and valve damaged. VW driver knows what i'm saying