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The engine develops brake power of 400 kW and consumes 1 liter of fuel in 30 sec (having a heating value of 44000 kJ/kg and density of 0.85 gm/cm3) that uses air of density 1.16 kg/m3 at ambient conditions of pressure and temperature of 1 bar and 27C. For cooling water flow rate of 9 Kg/sec with temperature rise of 10 c, pressure drop across air box orifice of 10 cm Hg for orifice diameter of 10 cm with discharge coefficient of 0.61 and exhaust gases temperature of 447 c, Provide the engine heat balance showing the percentage of un-account power due to heat loss.