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Wheels.8

Automotive 101

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{Wheels.8.4}: Jil {rabbit} Tue, 22 Jan 2002 15:21:36 CST (15 lines)

Let me see if I remember the sequence:

suck - bang - boom - push!

It's called a four-cycle engine or four-stroke engine because four
separate piston strokes (up and down movement) are required to
complete the cycle. They are:

Intake stroke - the piston slides down, forming a vacuum in the
cylinder. The valve(s) open and air/gasoline are drawn in.
Compression stroke - the piston slides upward, compressing the gas
Power stroke - the spark plug ignites the gasoline, and the resulting
explosion pushes the piston down
Exhaust stroke - the piston comes up again, the valve(s) open, and
the piston pushes the exhaust out

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