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For metric conversion:-
P=Power, kW
T=Torque, Nm
N=Engine rotational speed, rpm
P=T*pi*N/30000 or approximately T*N/9550
1 PS = 0.73549875 kW = 0.986320 hp
for imperial conversion:-
P=Power, horsepower
T=Torque, foot-pounds
N=Engine rotational speed, rpm
P=T*N/5252
The "magic numbers" are a result of the conversion steps from rotational to linear dynamics.
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