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CID X RPM X VE = cfm
1728 X 2
CID = engine displacment (in^3)
RPM = revolutions per minute
VE = engine volumtric efficiency (1 for 100% theoretical)
1728 = in^3 to ft^3 conversion factor
2 = For 4 stroke engine, 2 revolutions per total displacement
Calculate minimum volumetric flow. The idea is the bigger the better while minimizing pressure drop over the IC.
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