An oil engine work on diesel cycle with temperature of \(27^{\circ} \mathrm{C}\) at the beginning of compression. If the ratio of adiabatic expansion is 8 , find the thermal efficiency of cycle. Assume \(\gamma=1.41\). A four stroke petrol engine has a stroke - volume of 5.7 litres. Its mean effective pressure is 600 \(\mathrm{kPa}\) and RPM is 800 , find the indicated power of the engine.