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Power (effective)

The effective engine performance is determined on test-bench trails at the clutch or calculated on the driven wheels after subtracting the power losses occuring in the drive chain. Performance figures given for old-timers are to be treated with caution. In the American specification 'SAE-HP', the performance is determined in theory, without the cooling-fan, the cooling circuit, the generator and the back-pressure in the exhaust system. The Italian 'CUNA-HP' is not quite as optimistic, only the air-filter and the exhaust system have been left out. In both cases however, a higher performance figure than that given in 'DIN-HP' is to be expected.

The speed reached when the highest performance is delvered, is the Nominal speed.

Pe =

M =

n =

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n Speed (crankshaft) /min
M Torque (Clutch) Nm
P Power (effective) kW

The deriving of the constant '9550' is described here.

The horsepower unit (1 'HP' = 0,736 kW) as a performance measure, is completely outdated. It describes the continous performance of a horse. Over a short period, suitable specimens are able to produce way over 20 HP.

Modern rocket: 19 million kW (26 million HP)

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