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Calculate Head Air Flow From RPM And CID



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These formulas are from A. Graham Bell's Performance Tuning in Theory and Practice..


This is the "minimum" amount of Flow @ 28" needed to attain Peak HP at your RPM point

If you input 100(%) for Volumetric efficiency this will be close to the maximum rpm at peak HP at your CFM.

If you then input 127.5 (%) for Volumetric efficiency this will be close to the minimum rpm at peak HP at your CFM.


Head Flow From CID and RPM Calculator
Engine Size (CID):
Number of Cylinders:
RPM:
Volumetric Efficiency (typically 100-127.5):
FLOW at 28 inches: Input Data please