Volumetric Efficiency 101by Brian Barnhill
Source : http://tunertools.com/articles/volumetric-efficiency.asp
This can actually be a quite tricky subject, mostly due to confusion and differing opinions among many people. Volumetric efficiency (VE) is typically defined as "the actual amount of air being pumped by the engine as compared to its theoretical maximum."
Basically, VE is a measure of how "full" the cylinders are.
As most of us will know from basic science, gas will expand to fill its container. Seemingly, that would suggest...