- volumetric efficiency
-  A comparison between the actual volume of fuel mixture drawn in on the intake stroke and what would be drawn in if the cylinder were to be completely filled. In practice, a normally aspirated car engine does not take in an amount of an equal to the displacement, it passes only about 80% of the theoretical charge: i.e., volumetric efficiency is 80%; this can be increased by supercharging. Also see breathing capacity. Term used to express the relationship between the actual performance of a compressor or of a vacuum pump and calculated performance of the pump based on its displacement.
Dictionary of automotive terms. 2015.
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