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...as long as the Mach Index number (Z) does not exceed Z = 0.6, then volumetric efficiency (VE) is OK. But, as soon as Z > 0.6, VE declines rapidly:
Z < 0.5, VE increases
Z = 0.55, VE flattens
Z > 0.6, VE falls off (like a rock!).
...GOOGLE: "inlet-value Mach Index number" for details on relationship of VE to Z, and Z to valve (pipe) diameter and piston velocity (bore, stroke and engine RPM).
Last edited by gone-ot; 02-20-2010 at 04:36 PM..
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