For the tat outlined in Problem 13.8 an air box was fitted which had an orifice of 41.65 mm diameter with a discharge coefficient of 06 The corresponding manometer readings in millimetres of water were as follows: Manometeri(mm water) 33.50 3150 33.50 33.80 33.80 34.25 34.80 Take the density of the air at inlet as 1.215 kg/m;. Plot to a base of air-fuel ratio graphs of by and specific fuel consumption. What ate the air-fuel ratios at maximum power and maximum economy!