A four cylinder, two-stroke cycle petrol engine develops \(30 \mathrm{~kW}\) at \(2500 \mathrm{rpm}\). The indicated mean effective pressure of each is \(800 \mathrm{kPa}\) and \(\eta_{\text {mech }}=80 \%\). Calculate the diameter and stroke of each of the cylinder if \(\frac{L}{D}=1.5\). Also calculate the brake specific fuel consumption of the engine if brake thermal efficiency is \(28 \%\). The calorific value of petrol is \(44,000 \mathrm{~kJ} / \mathrm{kg}\).