Mean effective pressure

Mean effective pressure
Common symbols
p
SI unitPascal (Pa)
In SI base units1 kgm−1s−2
Derivations from
other quantities
p = W·V−1
Dimension

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).

  1. ^ Heywood, J. B., "Internal Combustion Engine Fundamentals", McGraw-Hill Inc., 1988, p. 50
  2. ^ Cite error: The named reference Schreiner 2011 p. 41 was invoked but never defined (see the help page).