Internal Combustion Engines
Flash point of fuel oil is

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

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

Nature of the fuel mixture strength
Temperature and pressure in the cylinder at the time of injection
Relative velocity between the fuel injection and air turbulence pressure of residual gases
All of these

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