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A 4-cylinder four stroke petrol engine develops 14.7 KW at 1000 r.p.m. The mean effective pressure is 5.5 bar. Calculate the bore and stroke of the engine, if the length of stroke is 1.5 times the bore.

A 4-cylinder four stroke petrol engine develops 14.7 KW at 1000 r.p.m. The mean effective pressure is 5.5 bar. Calculate the bore and stroke of the engine, if the length of stroke is 1.5 times the bore. Correct Answer 87.9 mm and 131.8 mm

Number of cylinder, n = 4 Power developed, P = 14.7 kW Engine speed, N = 1000 r.p.m. Indicated mean effective pressure, Pmi = 5.5 bar Length of stroke, L = 1.5D (bore) For four stroke cycle, k = 1/2 Indicated power developed, I.P. = (nPmiLANk x 10)/6 kw 14.7 = (4 x 5.5 x 1.5D x (pi/4 x D2)x 1000 x 1/2 x 10)/6 therefore, D3 = 0.0006806 or, D = 0.0879 or 87.9 mm and L = 1.5 x 87.9 = 131.8 mm.

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