Both types of engines burn
fuel through four distinct processes, known as “strokes.” How quickly they
complete these strokes is one of the biggest differences, but they both will
perform all four at some point.Intake is the first stroke. This is when the
piston travels down the cylinder while the intakevalve is opened to allow a
mixture of fuel and air to enter the combustion chamber. Next comescompression.
Here the intake valve is closed and the piston travels back up the cylinder,
thereby compressing the gasses. Combustion happens when the spark plug ignites
the compressed gas, causing it to explode; this forces the piston down. Finally
is exhaust, the final step that happens when the piston rises up the cylinder as
the exhaust valve is opened, allowing the piston to clear the chamber to start
the process over. Each time the piston rises and falls it turns the crankshaft
that is responsible for turning the wheels or propelling a non-wheeled vehicle.
This is how fuel is converted into forward motion.
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