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

They were well aware of the loss of volumetric efficiency inherent in this valve, and apparently went to some pains to obtain from it the best performance possible.

From Project Gutenberg

Gilmoure N. Cole, A. L. Rockwell, and the late L. Morgan Porter were major contributors, the latter having made the calculations of the shaking forces, the volumetric efficiency, and the connecting rod characteristics of the 1903 engine.

From Project Gutenberg

Possibly the Wrights clung too long to the automatic inlet valve, although it did serve them well; but possibly, as has been previously noted, there were valid reasons for continuing its use despite the inherently low volumetric efficiency this entailed.

From Project Gutenberg

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

From Project Gutenberg

The inherently lower volumetric efficiency of the L head engine is largely overcome by the use of a properly designed head, large valves and ample gas passages.

From Project Gutenberg