![]() You can calculate the Indicated Horse Power of a 4-stroke engine by the following formula – I.H.P = ((PLAN x n) / 2) ÷ 4500 ‘ Indicated Horse power‘ is the actual power developed by the engine whereas Brake Horse Power is the available power which is almost about 70 to 85 % of the actual power developed inside the engine. Metric system uses kilowatt (kW) unit of measurement while in the case of the imperial/British system, it is ‘ feet-pound-force-per-second‘ (fps).Įngine loses some of its generated power while overcoming its own friction known as ‘ Frictional Horse Power’. ![]() The engine’s power is commonly measured in Brake-Horse-Power (bhp), Pferdestärke (PS) which is the German translation of horsepower. The combustion process releases the heat energy which results in the generation of expanding forces known as power. lbf/s Engine Horse PowerĪ conventional engine produces its power by burning the fuel.This term comes from the erstwhile practice of measuring the rate of work done by a horse which equals to 33,000 ft-lb of ‘ work done’ per minute. The automotive engines use the term ‘ horse power‘ (hp) to measure its power. The work is defined as a ‘ force operating thru’ a distance‘. The power, in simple terms, is ‘ rate or speed of doing work’.
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