A four-cylinder, two-stroke petrol engine develops 30 kW brake power at 2500 rpm. The mean effective pressure on each piston is 8 bar and the mechanical efficiency is 80 %. The stroke-to-bore ratio is 1.5. Calculate (a) the bore and stroke of each cylinder (in mm) and (b) the brake specific fuel consumption (in kg/kWh) if the brake thermal efficiency is 28 % and the calorific value of the fuel is 44 100 kJ/kg.