It can be thought of as mean effective pressure lost due to friction. P MEP is the pumping mean effective pressure, which is the mean effective pressure calculated from work moving air in and out of the cylinder due to inlet throttling losses and residual gases in outlet.į MEP is the friction mean effective pressure, which is the theoretical mean effective pressure required to overcome engine friction.
Direct i MEP measurement requires combustion pressure-sensing equipment. I MEP is the indicated mean effective pressure, which is the mean effective pressure calculated from in-cylinder pressure-the average in-cylinder pressure over the engine cycle (720° in a four-stroke and 360° in a two-stroke).
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