A 100cc petrol engine with a compression ratio of 6 compresses the air fuel mixture to 900 kPa and 3750C.At the end of compression the ignition is started and the pressure rises along a straight line and attains the highest value of 3.0 MPa after the piston has travelled 4% of the working stroke. The air fuel ratio is 15:1. Take R for mixture as 0.275 kJ/kg-K , calorific value of fuel = 44 MJ/kg and cv = 0.965 kJ/kg-K. Find the heat loss per kg of charge during explosion. Flue gases and air has same gas constant.