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

Opens at top dead center and closes at bottom dead center
May open and close anywhere
Opens at 15° before top dead center and closes at 20° after top dead center
Opens at 15° after top dead center and closes at 20° before bottom dead center

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

Opens at top dead center and closes at bottom dead center
May open or close anywhere
Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center

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Internal Combustion Engines
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

The flow from the main jet is diverted to the compensating jet with increase in speed
Jet area is automatically varied depending on the suction
Flow is produced due to the static head in the float chamber
The diameter of the jet is constant and the discharge coefficient is invariant

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