Internal Combustion Engines
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

4-6 kg/cm² and 200-250°C
6-12 kg/cm² and 250-350°C
20-30 kg/cm² and 450-500°C
12-20 kg/cm² and 350-450°C

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Internal Combustion Engines
Detonation is harmful due to

Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
High intensity of knock causes crankshaft vibration and the engine runs rough
Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
None of these

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