calculating dispalcement of an cycle 4 internal combustion engine

Theoretically, the engine speed range between ‘ peak-torque’ rpm and ‘ max-horse power’ rpm is known as ‘ Power-Band’. The vehicle often needs more power when it is climbing a gradient as the engine has to pull the vehicle’s weight against the forces of gravity. Power is most useful while speeding & overtaking. Thus to achieve higher vehicle speeds, you need more power. Higher the power an engine can produce means that it can do more work OR give higher performance. The power curve in an engine represents its rate of doing work corresponding to engine’s rpm band. Incidentally, Bugatti Veyron is one of the most powerful cars in the world. The power output of an engine is usually represented in the graph as a curve against the engine rpm band. Although the power output varies from engines to engines, it is characteristically highest at the top-end of the engine’s rpm range. Most automotive engines produce power in a wide band of the engine’s speed. Hp = Torque X RPM ÷ 5252įurthermore, a dynamo-meter measures the power output of an internal combustion engine. You can also calculate the power output, if you know the torque value & engine rpm by the following formula.

(where, P = Mean effective pressure in kg/cm², L = Length of stroke, A = Area of piston in cm², N = RPM of crankshaft, n = Number of cylinders) B.H.P = (Torque x RPM) ÷ 5252įrictional Horse power = Indicated horse power – Brake Horse Power F.H.P = I.H.P – B.H.P The relation between the BHP, Ps & kW is: 1 Hp = 1.01 PS = 0.70 kW 1kW = 1.34 Hp = 1.4 PS 1 PS = 0.98 Hp = 0.70 kW 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’.

Calculating dispalcement of an cycle 4 internal combustion engine