abstract:The mean effective pressure is a quantity relating to the operation of a reciprocating engine and is a valuable measure of an engine's capacity to do work that is independent of engine displacement.Heywood (1988), page 50.
Anewindexis proposed to evaluateperformanceof the air-powered engine-theratioof the mean effectivepressureand the averagepressure in the engine cylinder.
In a review of the Swedish supercar the Koenigsegg Agera R, I displayed ignorance regarding a common measure of an engine's volumetric efficiency, the Brake MeanEffectivePressure.