BMEP Calculator

Brake Mean Effective Pressure (BMEP) is the average pressure which if applied uniformly on pistons from top to bottom of each power stroke, will produce the measured (brake) output. Select the engine type, and enter the torque and displacement values, the brake mean effective pressure calculator will provide you with the BMEP.

Brake Mean Effective Pressure Calculation

Nm
m3
Pa

Brake Mean Effective Pressure (BMEP) is the average pressure which if applied uniformly on pistons from top to bottom of each power stroke, will produce the measured (brake) output. Select the engine type, and enter the torque and displacement values, the brake mean effective pressure calculator will provide you with the BMEP.

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Formula:

Brake Mean Effective Pressure = ( n * t * 2 * 3.14 ) / d Where, n = No of Revolutions per Power Stroke t = Torque d = Displacement Note: n = 1 (For Two Stroke Engine) n = 2 (For Four Stroke Engine)

BMEP is one of the important values used in the comparison of performance of engines of same kind.

Example

Consider the torque of a two stroke engine is 15 Nm and displacement is 20 m3,

BMEP = (2 * 15 * 1 * 3.14) / 20
        = ( 30 * 3.14) / 20
        = 1.5 * 3.14
        = 4.712 Pa Therefore, the BMEP value is 4.712 Pa

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