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Indicated horsepower (IHP) is a measure of the power produced by an engine based on pressure in the combustion chamber, rather than the power delivered to the crankshaft or output shaft. It is calculated using the area under the pressure-volume curve during the engine's operating cycle, reflecting the engine's efficiency and performance. IHP is typically higher than brake horsepower (BHP), as it does not account for losses due to friction and other factors in the engine and drivetrain.

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