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Also SUMMIT Racing has several pages of detailed information on CFM and VE measurememts
If you want a more personalized cfm rating, you can calculate the number yourself. You will need to know your engine's:
The formula is:
cfm = (c.i.d. x rpm x VE) / 3,456
Volumetric efficiency (VE) is the actual amount of air flowing through an engine, compared to its theoretical maximum. Basically, it is a measure of how full the cylinders are.
VE is expressed as a percentage. An engine operating at 100% VE is using all of its volumetric capacity.
The formula for VE is:
VE = (cfm x 3,456) / (c.i.d. x rpm)
The specific CFM capability for a WA1 carburator is NOT listed in the Carter manual for this carburetor. It maybe possible to calculate the CFM from the mechanical size of the carburetors bore?
Dimensions: Flange size, 1'14 inch S. A. E.
Primary venturi, 11/32 inch I. D.
Secondary venturi, 11/16 inch I. D.
Main venturi, I% inch I. D.