A 8-cylinder, 4-stroke petrol engine of 80 mm bore and 90 mm stroke has a compression ratio of 7. It is tested at 4000 rpm on a dynamometer which has 54 cm arm. During a 10 minute test, the dynamometer reads 400 N and the engine consumes 4.75 kg of fuel. Air is supplied at 1 bar and 27°C at the rate of 6.5 kg/min. CV of fuel = 44 MJ/kg. Determine (a) the brake power (b) the brake mean effective pressure (c) the volumetric efficiency (d) the A:F ratio, and (e) the relative efficiency.