Question: A six-cylinder, four-stroke petrol engine develops (40 mathrm{~kW}) when running at (3000 mathrm{rpm}). The volumetric efficiency at NTP is (85 %). Indicated thermal efficiency is

A six-cylinder, four-stroke petrol engine develops $40 \mathrm{~kW}$ when running at $3000 \mathrm{rpm}$. The volumetric efficiency at NTP is $85 \%$. Indicated thermal efficiency is $25 \%$. The A/F ratio of the mixture supplied is $15: 1 . \mathrm{CV}$ of fuel used $=41 \mathrm{MJ} / \mathrm{kg}$. Assume stroke $/$ bore ratio $=1.25$.

Calculate the bore and stroke of the engine.

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