BMEP at Maximum (Max) Power Calculator

BMEP at maximum power is the effective way to measure the engine performance of any given type with the other of the same type. It produces the break power output when average pressure is imposed on a pistol from top to bottom in each stoke. This online calculator is used to find the Brake Mean Effective Pressure (BMEP) at max power by selecting the engine and providing the values for Torque, Number of Cylinders, Bore and Stroke.

Brake Mean Effective Pressure Calculation

kW
Pa
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Formula:

Brake Mean Effective Pressure = (( Pb(max) x nR x 103 ) / vd )x N(max) vd = ( n x 3.14 ) / ( 4 x Bore² x Stroke ) N(max) = 15 / (2 x Stroke)
Where, n = Number of Cylinders nR = Engine type Pb(max) = Maximum Power vd = Displacement N(max) = Maximum Rated Engine Speed Note: nR = 1 (For Two Stroke Engine) nR = 2 (For Four Stroke Engine)

Example

A 3 cylindric two stroke engine has a maximum power of 30 kW, with 3 bore and stroke as 5. What is its brake mean effective pressure?

Displacement = ( n x 3.14 ) / ( 4 x Bore2 x Stroke )
= (3 x 3.14) / (4 x 3^2 x 5)
= 0.0523

Nmax = 15/(2*5)
= 1.5

BMEP = ((30 x 1 x 10^3 ) / 0.0523) x 1.5
= ((30 * 1000)/0.0523) * 1.5
= (573613.7667304015296367) * 1.5
= 859872.6115
Therefore, BMEP of the two stroke engine is 859872.6115 Pa

Brake Mean Effective Pressure is a function of temperature of gases in the cylinder. To produce more heat, temperature has to be increased by burning more fuel. From the above calculator, BMEP at maximum power will be lower than torque because when providing the values for torque, revolution per minute (rpm) are at maximum for the engine and the loss of friction will also be maximum

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