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Problem 12: An actual four-stroke SI engine has a total cylinder volume of 0.0015 m3 and a compression ratio of 9:1. The engine runs at 3000 rpm. At the start of the compression stroke the air is at 303 K and a pressure of 100 kPa. The ratio of the actual thermal efficiency of the engine to the air-standard cycle efficiency is 45%. The air to fuel ratio is 13:1. The internal energy of combustion of the fuel is 47 MJ/kg. Calculate: a) the thermal efficiency of the engine; and b) the power output in kW

The answer is: 26.3% and 56.48 hp.
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