SOHC vs DOHC | Autotechlabs
Vložit
- čas přidán 19. 05. 2020
- 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!
- Auta a dopravní prostředky
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.
Keep going please, we need to learn things
Ryan Nugroho. 💪😎👍..
Yup
Library?
True.
😊👻
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😮
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.
I have been looking for this exact video for months without knowing that it existed. I can not thank you enough for this. Thank you.
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 :)
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!
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.
After 2 years you guys have done a video. Please give us atleast 2 videos per month. So happy to see a video of yours 😍
Great animations, great explanation. Thanks for the video. And please don't be gone for another 2 years.
Please make more videos, love the way you explain it!!! Can see the amount of hard work you have put!! The output is great!!!
Please keep posting, I’ve learnt so much thank you, you’re a blessing
Absolutely amazing videos. Makes want to lear more about cars. And I never was a "car guy". Please make some more 🙂
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.
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
A simple and understandable explanation with top tier visuals to boast it!
Keep going. You have great diagrams and the new voice is great
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 ❤
What a marvelous presentation, I've never seen a simplicity like that.
My channel guys
I love how CZcams recommends things I don't need to know but need to know! Thank you CZcams Thank you @autotechlabs
There's no question marks after the video at all. Even its not explained with my main language i have no problem to understand. Great job.
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
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.
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...
These videos are SO CLEAR! love it
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.
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 😕
Great videos 👍 it would be great to see some more videos come out Hopefully Soon !
I love this channel, autotechlabs rules, can you please make a video on how torque and horsepower are generated, not to interested in the math, just a video that shows when torque is low or high, same with horsepower, to give us a general understanding, videos on other channels just gives math leaving us more confused. It would really be appreciated, thanks
Sir, we need more content like this. Your videos are amongst the best and I’m sure that your channel will boom shortly.
Where would you put the spark plugs in a sohc engine?
Muy buen video, explicación muy clara!!
"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!
If you keep this channel going you have guaranteed subs
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!
Yamaha r15 v3 got sohc engine setup but got vva technology can u explain how
I do like the new voice lol and the quite music background makes it watchable thanks for the video! Big thumbs up 👍!!
you are more than a great teacher,thank you so much for this best video
When we read engine specifications of many bikes there are many bikes which shown only the cc of engine. And in many bikes specifications ohc written with cc of engine. Is engine can be manufactured without ohc
Hey which software editing you are using? Keen to check that
What’s program use for auto CAD video?
I to apply this computer CAD image for one-off parts for customers before inviting into my company.
The parts in clip look realistic and show brite chrome and vivid gold colors.
Please, what’s program to achieve these Image design???
great content please continue uploading more ! Thanks
Sir, Excellent presented. I am enjoying it from Bangladesh.
Incredible animations.. keep it coming! 👌🏼
What about cam-in-block or OHV (overhead valve) engines?
Good explanation; thanks! I'm trying to design a steam engine and it's been a real uphill battle! :-)
Best youtube channel so far, please continue doing videos
Question nowdays there are OHV? Does OHV use not rocker arms but that other things?
Precise & efficient video. Subbed!
Awesome video, I understood basic concept, thank you
Sir, what software do you use to create such as amazing technical animation???
Could you please tell me which softwares do you use to make such great videos ?
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
Could you show the vvl finger valve train in comparison?
You take 2 years to make this video....and lots of love to your channel....😍
Please tell me you are not from India😂
Welcome back sir
Congratulations
Good presentation. Very informative and educational.
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.
How about SOHC VTEC (Honda) and SOHC VVA (Yamaha) ? Both operating well in 4 valve / cylinder
Nicely explained! A very informative video for me.
So why do we have dohc if sohc is more fuel efficient at low RPM??
Forgive me if im wrong but we don't drive at 6000 RPM constantly
Please continue uploading videos. Great content .👍
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??
will tool is used to make animation like this?
In a SOHC would the force on the bearings of the rocker arms be lower if you move up the camshaft? It is a bit unfortunate that cams and spings push in the same direction. At least 90° vector add to 0.7
I’ve got a Audi 80 coupe DOHC 16v is it good?
4A-GE 20 Valve SIlver Top?
learning in simplest form. Thank U
What a great explanation
can you please give us a video on how the oil works in an engine
FANTASTIC VIDEO! MANY MANY THANKS.
Wouldn't simply changing the angle of the rocker arms or changing the shape of the cam lobes already improve the valve lift and thereby increasing volumetric efficiency in an SOHC?
Superb explanation! Thankyou, visuals were amazing💘🔥🔥🤝👏👏
Awesome channel to learn awesome mechanical knowledge
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.
Thank you so much, good channel 🙏🏼
NOTHING to say keep it up.... ♥️plz make a video about Automobile Engineering ❤️👍
Hey.i am from sri lanka..can i use some of your clips for my videos in sinhala
so, nissan DET engine uses DOHC camshafts?
great guy for sharing, i await for your next clip
Please upload more all of us need this
Can you guys do a clutch system in a FWD car?
Any way you guys could do a video on carburetors
Please post more videos. There are still a lot of things in a car engine which need to be covered.
Love your videos I learning lots from your videos I like the detailings the way you teach.❤
Good
What about engines that have 2 cams but only one cam gear? They're DOHC but how do they work?
Very good video, congratulations!
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 😉
Sohc have rocker arm,rocker arm shaft...while dohc only have camshaft. Which is less component?
So a DOHC never needs valve adjusting? It's all dependent on the cam for open/close position?
How can I use your video to build a course? Please contact me regarding permissions or collaboration. Thank you
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...
I love this! Keep up the amazing work! Some channels explain how stuff work.. you guy do that too BUT the visual part of it is awesome! Makes you guys one of a kind! Road to 1 million subs! Just subbed!
Very well done. Thank you.
My Acura has a dual overhead cam V6. Great engine! No problems whatsoever!😁
If i got it correctly, dohc is better? If yes, how do i know if a car has dohc inside its engine? Thanks in advance
awesome explanation and animation
Thanks for the info......it was useful
Nice and concise, thanks