Quote:
Originally Posted by haycait911
it's my understanding, very limited admittedly, that a longer intake run helps lower end torque. no?
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How I was told it works:
A pressure wave is created when the intake valve closes. This wave travels at the speed of sound from the intake valve, to open atmosphere, and then bounces back to the intake valve. When this wave hits just before the intake valve closes, it pushes extra air into the combustion chamber, improving volumetric efficiency.
The longer the intake, the longer it takes the pressure wave to hit the valve, helping low RPMs.
The shorter the intake, the shorter time it takes. High RPMs.