This calculates the cubic feet per minute (cfm) of air that an engine will consume at its maximum rpm. This is a great tool for estimating carburetor or throttle body sizing to avoid going either too small or too big (which is a common mistake).
|cubic inches||the total displacement of the engine in cubic inches (see our cid calculator)|
|max rpm||the engines maximum rpm limit|
|volumetric efficiency||the volumetric efficiency is a measure of the efficiency of the engine moving the intake charge into the chamber and the exhaust out. Typical values are as follows:|
2 valve head – 80%
4 valve head – 88%
it is not unusual however to have VE’s of 95% or more in correctly built race engines
|cubic feet per minute||the total cubic feet per minute of air that the engine will consume|