Nominal is derived from the size of the engine and the piston speed and is only accurate at a pressure of 48 kPa (7 psi).[11] Indicated or gross horsepower (theoretical capability of the engine) minus frictional losses within the engine (bearing drag, rod and crankshaft windage losses, oil film drag, etc.), equals Brake / net / crankshaft horsepower (power delivered directly to and measured at the engine's crankshaft) minus frictional losses in the transmission (bearings, gears, oil drag, windage, etc.), equals Shaft horsepower (power delivered to and measured at the output shaft of the transmission, when present in the system) minus frictional losses in the universal joint/s, differential, wheel bearings, tire and chain, (if present), equals Effective, True (thp) or commonly referred to as wheel horsepower (whp)
Source:
Horsepower - Wikipedia, the free encyclopedia
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