This calculates the pounds of air per minute (mass flow) that and engine will consume at its maximum rpm.

cubic inchesthe total displacement of the engine in cubic inches (see our cid calculator)
max rpmthe engines maximum rpm limit
volumetric efficiencythe volumetric efficiency is a measure of the efficiency of the engine moving the intake charge into the chamber and the exhaust out. Typical values are as follows:

2 valve head – 80%

4 valve head – 88%

it is not unusual however to have VE’s of 95% or more in correctly built race engines
air mass flowthe total mass flow of air per minute that the engine will consume
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