The temperature of the gases in a car engine during combustion is you C The exhaust is expelled at you C

a Calculate the maximum theoretical thermal efficiency of the engine.

b Critically compare how changes in the thermal efficiency of the engine during warm up andor cool down can affect the behavioural characteristics and performance of the engine and associated components.

Points to consider:

engine materials and their propertiesbehaviour under temp change,

pressure,

oil and its viscosity,

compression ratio,

behaviour of other components turbosupercharger

coolant system,

friction,

buildup of contaminants etc.