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This is my theory: The compressed volume of the air/fuel mixture is larger than the volume of the exhaust gas. Same as putting 50 lbs. of wood in a stove and having the ashes weigh less than 5 lbs.

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Q: Why intake valve is larger than exhaust valve?
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Why the intake valve smaller than exhaust valve?

The intake valve is always larger than the exhaust valve. It's just physics.


In most engines head of the intake valve is?

the intake valve head is larger than the exhaust valve head


Which is intake valve on Chev 350?

Intake valves are larger than exhaust valves, and are aligned with the intake runners on the intake manifold.


Why the clearance of gap exhaust valve is big than intake valve?

The exhaust valve gets hotter than the intake valve.


Which valve is exhaust and which valve is intake on 94 GM 350ci?

look at the head with the valve cover off find where the exhaust manifold goes in tha is the exhaust valve or looking at the valves the first one is exhaust then intake then intake ,exhaust,exhaust,intake,intake,exhaust if you have the head off i think the intake valves are bigger than the exhaust


You have a pair of sbc heads?

need to no if the first valve is intake or exhaust The intake valve is always bigger than the exhaust valve.


How can the inlet and exhaust valve be identified on an assembled engine?

On a fully assembled engine, the intake and exhaust valves will not be visible. If the cylinder head is removed from the engine, the valves will then be visible. The intake valve faces are usually larger than those of the exhaust valves, and can be easily distinguished visually.


Why the exhaust valve bigger than intake valve?

It's not. Intake valves are almost always bigger.


Why is the exhaust valve bigger than the inlet valve?

The intake valve is always bigger than the exhaust valve because there is more volume going in to the cylinder than coming out.


Why are intake and exhaust valves different materials?

The exhaust valve runs much hotter than the intake valve, so it has to be made out of a more durable(and more expensive) material. The intake valve can get by with a simpler and less expensive material.


What is Exhaust and intake valve?

As an air/fuel mixture is drawn into the intake ports, intake valves open to allow the mixture to enter the cylinder. On the exhaust stroke of an engine, the exhaust valves open, allowing the burned air/fuel mixture to exit out the exhaust ports. Intake valves are larger than exhaust valves, and are able to be found on the "cold" or intake side of the cylinder head(s).


Is the exhaust valve smaller or bigger than the intake valve?

Intake valves are are almost always larger than exhaust valves . The exception may be in a low performance small engine where sometimes both the intake and exhaust valves are the same size.The intake phase of the 4 stroke cycle relies on engine vacuum produced during the piston down stroke to draw the fuel / air mixture into the cylinder.Vacuum (as opposed to pressure) is a relatively weak force; therefore a larger opening (larger intake valve size) must be provided in order that sufficient quantities of fuel and air enter the cylinder - for the engine to run.Removing the exhaust gasses is a much easier task - due to the pressure created by the upstroke of the piston.Because the pressure created by the piston is a much stronger force (than the vacuum the piston created during the intake stroke), the exhaust gasses can escape (they are actually pushed out) through a much smaller opening, past the exhaust valve.The intake valve is bigger.