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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.
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Exhaust valve smaller or bigger than intake valve in a turbo charged engine?
the exhaust valve will always be smaller as the piston is forcing the combusted gases out. The intake valves have to be bigger as the piston is only drawing the mixture in through sucktion.
What valve is exhaust and what valve is intake?
intake valve is bigger.
What valve is exhaust and what valve is intake on 96 GM 350Ci?
The bigger valve is the intake.
How do you tell Which is the intake and which is the exhaust valve on a 305 motor?
The intake valve is bigger.
Why the exhaust valve bigger than intake valve?
It's not. Intake valves are almost always bigger.
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.
Why the intake valve smaller than exhaust valve?
The intake valve is always larger than the exhaust valve. It's just physics.
Which valve is intake and which valve is exhaust on a 1992 gm 4.3?
The exhaust valve is always smaller.
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
How do you tell difference between exhaust valve and intake valve on 1998 suburban 5.7?
The intake valve is bigger.
Which valve is intake which one exhaust on b and s 15.5 ohv?
The intake valve is always bigger.
What is the different between the intake valve and exhaust valve?
The intake valve is bigger to allow the air and fuel into the cylinder. The exhaust valve is thicker to accommodate the heat from the combustion process.
