Question: A four - cylinder SI engine running at 1 2 0 0 rpm gives 1 8 . 8 7 kW as brake power. When one

A four-cylinder SI engine running at 1200 rpm gives 18.87 kW as brake power. When one cylinder missed firing the average torque Calculate the indicated thermal efficiency if the calorific value of fuel is 42000 kJ/kg. The engine uses 0.335 kg of fuel per kW/h. What is the mechanical efficiency of the engine?

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