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a piston itself doesn't really do anything. It's just a piece of metal inside the cylender that moves up and down. Here's a total break down. Ok so the piston is in the up position as the piston moves down the cylinder the fuel valves let fuel and air into the cylinder. Once the piston has reached the bottem it is forced back up which compresses the fuel air mixture in the cylinder. Then the spark plug goes off which ignited the fuel and causes an explosion. This explosion forces the piston down which is what turns the driveshaft (the part that brings power to the transmission) this also moves the other pistons to that they can complete their cycles. Once it has reached the bottem it is puches back up wich forces the burnt mixture out of the exhaust valves. Then the whole process starts over again.
A bicycle actually has no pistons. It has a chain link 'motor' and pedals for which you push down on to move the bike.

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12y ago

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