Physics
Carburetor CFM Calculator
Find the carburetor airflow an engine needs.
Did this calculator solve your problem today?
✓ Thank you for your feedback!
Report issue to loopingon.com
Sponsored
Sizing a carburetor means matching its airflow (CFM) to the engine's appetite.
The math behind it
CFM = (CID × rpm × VE) ÷ 3456. The 3456 converts cubic inches per two revolutions to cubic feet per minute.
Worked Example
350 CID at 6000 rpm, 85% VE → about 516 CFM.Frequently Asked Questions
Bigger CFM is better?
Not always — an oversized carb hurts low-rpm response and economy.
Advertisement