How a 4-stroke engine?
An internal combustion engine is basically a machine that mixes oxygen with the fuel gasified. Once mixed intimately and confined in a space called the combustion chamber, the gases are ignited to burn (combustion).
By design, the engine uses the heat generated by combustion, and energy to produce rotary motion that we know.
Motor Gasoline or Alcohol
In the animated figure below you can see the operation of 4-stroke engine.
1st Half: intake stroke. Opens intake valve, the piston down and the cylinder is filled with air mixed with fuel.
2nd half: compression stroke. Closes the intake valve, the piston rises and compresses the air / fuel.
3rd time: expansion stroke. Compressed mixture is ignited and the heat generated by the expanding combustion gases that exert pressure on the piston.
the 4th time: exhaust stroke. Opens the exhaust valve, the piston moves toward TDC, expelling the burned gases.
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