indicated mean effective pressure

The average pressure produced in the combustion chamber during the operating cycle. It is an expression of the theoretical, frictionless power known as indicated horsepower. In addition to completely disregarding power lost to friction, indicated horsepower gives no indication as to how much actual power is delivered to the propeller shaft for doing useful work. However, it is related to actual pressures that occur in the cylinder and can be used as a measure of these pressures. IMEP is equal to brake mean effective pressure (BMEP) plus friction mean effective pressure (FMEP).

Aviation dictionary. 2014.

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  • indicated mean effective pressure — (IMEP) The average pressure within an engine cylinder during a working cycle, calculated from an indicator diagram …   Dictionary of automotive terms

  • Mean effective pressure — The mean effective pressure is a quantity related to the operation of an reciprocating engine and is a valuable measure of an engine s capacity to do work that is independent of engine displacement[1]. When quoted as an indicated mean effective… …   Wikipedia

  • mean effective pressure: (MEP) — The average pressure of the burning fuel on the power stroke subtracted by the average pressure on the other three strokes. Pressure is in pounds per square inch. Average pressure on a surface when a changing pressure condition exists. Also see… …   Dictionary of automotive terms

  • brake mean effective pressure — A measure of mean effective pressure in a cylinder of a reciprocating engine. It is the average in excess of ambient pressure inside the cylinder during the power stroke. It is measured in pounds per square inch (psi), kilopascals (kPa), or bars… …   Aviation dictionary

  • friction mean effective pressure — That part of the indicated mean effective pressure (IMEP) used to overcome internal friction in a combustion chamber of a reciprocating engine. The difference between the IMEP and the brake mean effective pressure (BMEP) is the FMEP. The FMEP and …   Aviation dictionary

  • effective pressure — See brake mean effective pressure indicated mean effective pressure mean effective pressure …   Dictionary of automotive terms

  • pressure — [1] The force due to the weight of a substance exerted over the area the substance occupies. In metric measure, it is the force acting on each square metre. To calculate pressure, divide the force (in newtons) by the area (in square metres). It… …   Dictionary of automotive terms

  • effective — [1] actual rather than theoretical or potential. [2] producing an effect. Also see cost effective indicated mean effective pressure mean effective pressure …   Dictionary of automotive terms

  • mean — See indicated mean effective pressure …   Dictionary of automotive terms

  • Indicated horse power — Horse power Horse pow er 1. The power which a horse exerts. [1913 Webster] 2. (Mach.) A unit of power, used in stating the power required to drive machinery, and in estimating the capabilities of animals or steam engines and other prime movers… …   The Collaborative International Dictionary of English

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