volumetric efficiency

noun

1. the ratio of fluid delivered by a piston or ram pump per stroke to the displacement volume of the piston or ram
2. the ratio of air or gas-air mixture drawn into the cylinder of an internal-combustion engine to the volumetric displacement of the piston

Example Sentences

The valves and valve springs are especially accessible and of such size as to permit high volumetric efficiency.

From Project Gutenberg