Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engines

May open and close anywhere
Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
Exhaust valve opens just after bottom dead center and closes just before top dead center
Exhaust valve opens at bottom dead center and closes at top dead center

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Internal Combustion Engines
Pour point of fuel oil is the

It catches fire without external aid
Temperature at which it solidifies or congeals
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
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

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