Carburetor CFM Calculator

Displacement in cubic inshese (CID):

Maximum revolutions per minute (RPM):

Volumetric efficiency (VE) :

How This Is Calculated

C F M = \frac{C I D \cdot R P M \cdot V E}{3456}

where:

CFM = Cubic feet per minute (cfm)

CID = Displacement in cubic inshes (in³)

RPM = Maximum revolutions per minute (RPM)

VE = Volumetric efficiency (RPM)

Assumptions

Air-fuel mixture is ideal.
Volumetric efficiency remains constant.
The engine is four stroke.
Torque remains constant across RPM range.

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