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The bore and stroke of the single-cylinder four-stroke engine are 90 mm and 120 mm respectively. The torque is 24 Nm. What is the brake mean effective pressure of the engine?

The bore and stroke of the single-cylinder four-stroke engine are 90 mm and 120 mm respectively. The torque is 24 Nm. What is the brake mean effective pressure of the engine? Correct Answer 3.9 bar

Brake mean effective pressure = pbm, torque = T = 24 Nm, stroke = L = 120 mm, bore = D = 90 mm. pbm = 16T / D2L = (16*24) / (0.09*0.09*0.12) = 3.9 * 105 Pa = 3.9 bar.

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