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
12-20 kg/cm² and 350-450°C
20-30 kg/cm² and 450-500°C

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

May start and end anywhere
Starts at top dead center and ends at 30° after top dead center
Starts at 15° after top dead center and ends at 30° before bottom dead center
Starts at 15° before top dead center and ends at 30° after top dead center

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