The Myths And Realities Of Carburetor Sizing

Uncle Tony with Engine and Carburetor

Calculating cubic inches and volumetric efficiency to arrive at the correct carburetor CFM size for any given engine combination seems like a reasonable way to go about things. Sure, the formulas work well when you’re dealing with a completely stock engine, but when you start trying to make real power, it will leave you wanting a whole lot more.

Uncle Tony offers up a rundown of some of the factors at play, how the manufacturers chose carburetor packages, and a few basic guidelines that will get you headed in the right direction…