The Basics

How a 4 Stroke Engine Works

The cycle of a 4-stroke engine consists of 4 parts:

  1. Intake - a fuel and air mixture gets sucked into the cylinder
  2. Compression - the mixture gets compressed to make the effects of combustion more powerfull.
  3. Combustion - the mixture is ignited with a spark from the spark plug and expands as it combusts (burns)
  4. Exhaust - the exhaust (burnt gasses) is pushed out of the cylinder by the piston
To see an animation of the working of a 4-stroke engine click here and wait for the file to load.
A 4 stroke engine.

1 Cylinder
2 Piston
3 Connecting Rod
4 Crankshaft
5 Engine Block
6 Valves
7 Spark Plug


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