But the info is mostly wrong. Clear, but dead wrong.

Ryan Nugroho. 💪😎👍..

Yup

Library?

True.

😊👻

You don't really understand something unless you can explain it to your grandmother.

​@@mauj.2409😮

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.

The wet brake vs pads bakes is an interestering one which could be nice to see :) Great suggestion

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...

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.

My channel guys

@Gibbon when life was better 😕

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.

😁

@@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.

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!

Please tell me you are not from India😂

Right. It depends on the design.

Good

Z do You are 100% correct.

DOHC provides greater performance from my experience

Which is why diesel is so popular.

and it's also ideal in city driving where you always accelerate from red light, and for passing other vehicles quickly

Likely due to cost.

when the cost is down? everything is about cost.

Never, mechanical components have better reliability than electrical therefore in everyday use we will always have camshafts.

Likely in this decade, due to new pollution norms inside the EU. It's hard already to respect Euro 7 with current engine tech, most likely there will be steps in adopting Koenigsegg FreeValve like tech on mainstream cars. This would improve efficiency a lot, and also could lead to a more easier fix using firmware update to enhance vehicle usability in the latter of it's life and so it's likely to use a car for more of it's life at the same standards of pollution. Yes, might not be what the car producers wants, but it is what they need to do.

It’s already been done, look up Koenigsegg no cam engine