It is the theoretical constant pressure which may be assumed acting on the piston during power stroke.
It is a pressure which on acting upon the piston, performs the same works as the actual pressure on the operating cycle. It is the ratio of the work done during the working stroke to the swept volume. It is determined graphically from a diagram or calculated from engine parameters.
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Mean effective pressure is a term used for calculation of mechanical efficiency while using a brake/dynamometer.
Mean indicated pressure is used on ships while checking performance. And is calculated by using indicator diagrams.
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