Friction mean effective pressure calculation requires accurate measurement of cylinder pressure and dynamometer brake torque. The state of the air at the beginning of compression is fixed by P1 95 kPa, T1 27 Celcius, and V1 6.0 liters. The processes within each cylinder of the engine are modeled as an air-standard Diesel cycle with a cutoff ratio of 2.4. Friction mean effective pressure (FMEP) - Theoretical mean effective pressure required to overcome engine friction, can be thought of as mean effective pressure lost due to friction. The displacement volume of an internal combustion engine is 5.6 liters.Direct measurement requires cylinder pressure sensing equipment. Calculated from in-cylinder pressure over intake and exhaust portions of engine cycle (360° in a four-stroke, 0° in a two-stroke). Pumping mean effective pressure (PMEP) - Mean effective pressure from work moving air in and out of the cylinder, across the intake and exhaust valves.Net indicated mean effective pressure (IMEP n) - Mean effective pressure calculated from in-cylinder pressure over the complete engine cycle (720° in a four-stroke, 360° in a two-stroke). Gross indicated mean effective pressure (IMEP g) - Mean effective pressure calculated from in-cylinder pressure over compression and expansion portion of engine cycle (360° in a four-stroke, 180° in a two-stroke).Brake mean effective pressure (BMEP) - Mean effective pressure calculated from measured brake torque. Mean effective pressure (MEP) is defined by the location measurement and method of calculation, some commonly used MEPs are given here. L − 1 M T − 2 Types of mean effective pressures
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