A four cylinder 2.5liter SI automobile engine operates at WOT on a four-stroke air standard Otto cycle at 3000rpm. The engine has a compression ratio of 8.6:1, a mechanical efficiency of 86% and a stroke-to-bore ratio S/B = 1.025. Fuel is isooctane with AF=15, a heating valve of 44,300kJ/kg and a combustion efficiency ƞc=100%. At the start of the compression stroke, conditions of the cylinder combustion chamber are 100kPa and 60°C. It can be assumed that there is a 4% exhaust residual left over from the previous cycle. Calculate the:   (a) Complete thermodynamic engine analysis of the engine, (b) Net indicated work during one cycle in kJ, (c) Indicated thermal efficiency

A four cylinder 2.5liter SI automobile engine operates at WOT on a four-stroke air standard Otto cycle at 3000rpm. The engine has a compression ratio of 8.6:1, a mechanical efficiency of 86% and a stroke-to-bore ratio S/B = 1.025. Fuel is isooctane with AF=15, a heating valve of 44,300kJ/kg and a combustion efficiency ƞ_c=100%. At the start of the compression stroke, conditions of the cylinder combustion chamber are 100kPa and 60°C. It can be assumed that there is a 4% exhaust residual left over from the previous cycle. Calculate the:  

(a) Complete thermodynamic engine analysis of the engine, (b) Net indicated work during one cycle in kJ, (c) Indicated thermal efficiency