Volumetric Efficiency

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

This is the calculation for the volumetric efficiency for an internal combustion engine. For a thermal engine, the combustion process depends on the air-fuel ratio inside the cylinder. The more air inside the combustion chamber, the more fuel that can be burned and the higher the output engine torque and power.

Volumetric Efficiency Formula

$$\large{ VE = \frac{3456 \; CFM}{CID \; RPM} }$$

Where:

$$\large{ VE }$$ = volumetric efficiency

$$\large{ CFM }$$ = cubic feet per minute

$$\large{ CID }$$ = cubic inch displacement

$$\large{ RPM }$$ = engine speed