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.
The relationship between the actual performance of a compressor or of a vacuum pump and calculated performance of the pump based on its displacement.
Ratio between a cylinder's theoretical capacity and the actual volume of fuel mixture drawn into it during the induction stroke.
Is calculated by dividing the mass of air inducted into the cylinder between IVO and IVC divided by the mass of air that would fill the cylinder at atmospheric pressure (with the piston at BDC). Typical values range from 0.6 to 1.2, or 60% to 120%. Peak torque always occurs at the engine speed that produced the highest volumetric efficiency.
A percentage ratio that varies with the engine's rpm measuring the difference between the air-fuel mixture actually entering a cylinder and the amount that can enter under ideal conditions.
The ratio and percent of the actual delivered capacity (measured at inlet temperature, pressure and gas composition) to the piston displacement. ( 097)
The ratio of free air delivered to the displacement of a compressor.; this ratio is normally expressed as a percentage; condensates, may possibly be taken into account (ISO 3857/2).
Percent found by dividing the actual volume of gas pumped by a compressor by its displacement, both expressed in the same units (usually cfm).
Volumetric efficiency in internal combustion engine design refers to the efficiency with which the engine can move the charge into and out of the cylinders. More correctly, volumetric efficiency is a ratio (or percentage) of what volume of fuel and air actually enters the cylinder during induction to the actual capacity of the cylinder under static conditions. Therefore, those engines that can create higher induction manifold pressures - above ambient - will have efficiencies greater than 100%.
