Mean effective pressure
Measure of an engine's capacity to do work / From Wikipedia, the free encyclopedia
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The mean effective pressure (MEP) is a quantity relating to the operation of a reciprocating engine and is a measure of an engine's capacity to do work that is independent of engine displacement.[1] Despite having the dimension of pressure, MEP cannot be measured.[2] When quoted as an indicated mean effective pressure (IMEP), it may be thought of as the average pressure acting on a piston during the different portions of its cycle. When friction losses are subtracted from the IMEP, the result is the brake mean effective pressure (BMEP).