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Bob Bidonde · 04-15-2018, 01:24 PM

My speculation is the Model A needs to breath 100 CFM in stock form. I base this on the engine's volumetric efficiency.

100% Volumetric Efficiency means that the engine can breath its total displacement in one combustion cycle. So for 200 cubic inches, and assuming the "L" head engine has a 50% Volumetric Efficiency, the carburetor needs to be capable of 100 CFM

Does anyone know the CFM of the Model A's Zenith carburetor?

04-15-2018, 01:24 PM	#1
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 3,470	Zenith Carburetor CFM? My speculation is the Model A needs to breath 100 CFM in stock form. I base this on the engine's volumetric efficiency. 100% Volumetric Efficiency means that the engine can breath its total displacement in one combustion cycle. So for 200 cubic inches, and assuming the "L" head engine has a 50% Volumetric Efficiency, the carburetor needs to be capable of 100 CFM Does anyone know the CFM of the Model A's Zenith carburetor? __________________ Bob Bidonde