Volumetric efficiency

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It is the ratio of the actual volume of the charge drawn in during the suction stroke to the swept volume of the piston.The amount of air taken inside the cylinder is dependent on the volumetric efficiency of an engine and hence puts a limit on the amount of fuel which can be efficiently burned and the power output. The value of volumetric efficiency of a normal engine lies between 70 to 80 percent, but for engines with forced induction it may be more than 100 percent.