An Otto cycle engine has a compression ratio of 9 and uses CH18 octane as fuel. Since the lowest calorific value of LHV fuel is 44500kj/ kg and the ratio of air to fuel is 15:1 Calculate the maximum value of pressure and temperature in the cycle a- (not counting the expansion of molecules) b- With calculating the expansion of the particles assuming that cv=0.71KI / Kg.K and the pressure and expansion follow the rule pV^1.3= constant pressure and temperature at the beginning of the compression stroke is 60 bar, and calculate the expansion ratio of the particles