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

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

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Internal Combustion Engines
A hydraulic ram is a device used to

To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
Increase the pressure of water
Store the energy of water
To lift water from deep wells

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