An eight cylinder automobile engine of 80 mm diameter and 90 mm stroke with a compression rarion of 7, is tested at 4000 RPM on a dynamometer of 600 mm arm length. During a ten minutes test period at a dynamometer scale reading of 450 N, 4.8 kg of gasoline having a calorific value of 45000 kJ/kg was burnt and air at 270C and 1.0 bar was supplied to the carburetor at the rate of 6.6 kg/min. Find (i) the brake power delivered, (ii) the brake mean effective pressure, (iii) the brake specific fuel consumption, (iv) brake thermol efficiency, (v) the volumetric efficiency and (vi) the air-fuel ratio.