Re: Volumetric Efficiency
The volumetric efficiency has to vary by rpm. At low rpm the air/fuel has a longer time to enter the cylinders. At higher rpm the valve configuration will limit how much air/fuel gets in, assuming a larger carburetor and intake manifold than stock. The overhead conversions are meant to fix this.
As an old automotive engineer, this stuff is interesting to me. I have learned that not all persons think the same way I do. I am married to one. She has no idea what a piston is and doen't care.
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