Friction mean effective pressure calculation requires accurate measurement of cylinder pressure and dynamometer brake torque. 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.
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). Overview You probably already know that an engine has pistons which convert their reciprocating motion (up and down motion) to rotary (rotational motion) of the crankshaft.
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. Friction mean effective pressure (FMEP) The lost mechanical work is regarded as friction work. This technique is suited to someone who is in the middle of putting an engine together and has the right tools, or someone whose engine is already in pieces.L − 1 M T − 2 Types of mean effective pressures At idle speed, the brake output of the engine is 0, because all the combustion energy is used to maintain the engine speed.This means that, at idle speed, the energy losses of the engine is 100. We're looking at the first of these ways here. Firstly, you can make a math calculation as accurately as possible, or secondly - the more popular method - uses an empty spark plug socket with a pressure gauge inserted. There are two ways of calculating the compression ratio for an engine. The compression ratio is the ratio between two elements: the gas volume in the cylinder with the piston at its highest point (top dead center of the stroke, TDC), and the gas volume with the piston at its lowest point (bottom dead center of the stroke, BDC). The compression ratio of an engine is a very important element in engine performance. How to use this calculator: Simply fill in all the boxes below with the requested figures and click on "Calculate CR" to find your engine's compression ratio. This compression ratio calculator can be used to work out the compression ratio of your engine.
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