Cylinder
(engine)
An
engine cylinder is the round, straight-sided tube that is
machined into the engine block and contains a piston. Typically
an automobile engine has four, six, or eight cylinders. As
the piston moves down inside a cylinder, it creates a chamber
into which fuel and air are drawn; as the piston moves up
again, these gases are compressed. A spark from a spark plug then ignites the gases and a contained explosion
forces the piston down again creating a driving force. The
burnt gases are expelled from the cylinder as the piston rises,
and the cycle is repeated.
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