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A internal combustion engine works by exploding fuel inside a confined space, over the top of a piston. first the explosion pushes down the piston then the piston has to come up again. For this to able to take place there has to be a way for the fuel to get into the space over the piston and a way for the burnt gas to get out again. So a system of valvesUsually two valves for each piston (although sometime it can be more) One valve Inlet valve) opens to allow fuel into the cylinder head as the piston goes down, it then closes. as the piston moves up it compress the fuel gas, the spark plug fires and as the piston starts to head back down again the fuel explodes forcing the piston down faster. When the piston with the spent fuel reaches the bottom of the stroke it the other valve( exhaust valve) opens up to allow the spent fuel to exhaust out of the motor into the exhaust pipe. and closes again. in a motor all of this is very cleverly timed so that all of the pistons work as a team and keep the engine going.
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