Internal Combustion Engines
Pour point of fuel oil is the

Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
Temperature at which it solidifies or congeals
It catches fire without external aid

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engine the inlet valve

Opens at 20° before top dead center and closes at 35° after the bottom dead center
May open or close anywhere
Opens at 10° after top dead center and closes 20° before the bottom dead center
Opens at top dead center and closes at bottom dead center

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Internal Combustion Engines
In a four stroke cycle petrol engine, the compression

Starts at bottom dead centre and ends at top dead centre
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
May start and end anywhere
Starts at 40° after bottom dead centre and ends at 30° before top dead centre

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