Question: A 4.2-liter, V6, SI engine operates on four-stroke cycle at an engine speed of 3500 RPM. The bore and stroke are related as S=1.2B.

A 4.2-liter, V6, SI engine operates on four-stroke cycle at an engine

A 4.2-liter, V6, SI engine operates on four-stroke cycle at an engine speed of 3500 RPM. The bore and stroke are related as S=1.2B. The air-fuel ratio is 16. The petrol fuel has a heating value of 43,000 kJ/kg, and its combustion efficiency is 98%. The engine consumes fuel at a rate of 30 kg/h. The indicated thermal efficiency is 49% and mechanical efficiency is 85%. Determine: (a) Average piston speed. [m/s] (b) Torque. [Nm] Volumetric efficiency. [%] (d) Brake mean effective pressure. [kPa] Brake specific fuel consumption. [g/kWh] [5] [9] [4] [4] [3]

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a Average piston speed The average piston speed can be calculated using the formula aps 4 N S 2 B where N is the engine speed in revolutions per minut... View full answer

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