Question: A 4 cylinder 4 stroke petrol engine with bore equal 10 cm and stroke of 8 cm and with a clearance volume of 75

A 4 cylinder 4 stroke petrol engine with bore equal 10 cm

A 4 cylinder 4 stroke petrol engine with bore equal 10 cm and stroke of 8 cm and with a clearance volume of 75 cm3 is running at 3200 rpm and attached to a dynamometer produces 200 N.m. the mass of the fuel tank before and after the five minutes of operation are 634.56 and 32.8 g respectively. The calorific value of the fuel is 43500 KJ/Kg. Cooling water circulates at rate of 453 Kg/hr with inlet temperature is 8 C and the output temperature is 85 C. knowing that the engine is running on stoichiometric and the friction power of this engine is 10.4 kw, the specific heat for water is 4180 J/kg.C., and the air to fuel ratio is 14.7:1 Determine 1. The compression ratio of the engine [5 marks] 2. The brake power [4 marks] 3. indicated specific fuel consumption [4 marks] 4. Mechanical efficiency [4 marks]

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