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 \(45000 \mathrm{~kJ} / \mathrm{kg}\).