Question: A four cylinder, four stroke cycle petrol engine develops (40 mathrm{~kW}) at (2500 mathrm{rpm}). The mean effective pressure is (0.8 mathrm{MPa}) and mechanical efficiency is

A four cylinder, four stroke cycle petrol engine develops $40 \mathrm{~kW}$ at $2500 \mathrm{rpm}$. The mean effective pressure is $0.8 \mathrm{MPa}$ and mechanical efficiency is $80 \%$. Calculate diameter and stroke of each cylinder if stroke to bore ratio is 1.5. Also calculate the brake specific fuel consumption of the engine if the brake thermal efficiency is $25 \%$. The calorific value of fuel is $45000 \mathrm{~kJ} / \mathrm{kg}$.

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