The most common cycles are the 2 stroke and 4 stroke. One cycle means the pistion inside of the cylinder will move fron one end to the other 2 times in a 2 stroke engine and 4 times in a 4 stroke engine. 2 cycle
1. intake and compression - air/fuel is drawn in and compressed by the pistion moving to the top of the cylinder
2. combustion and exaust - compressed air/fuel is ignited and gases expelled as pistion moves to the bottom of the cylinder 4 cycle (spark ignition engine)
1. intake - exaust valve(s) are closed then the intake valve(s) open and air/fuel is drawn in as piston moves to bottom of the cylinder
2. compression - intake valve(s) close and air/fuel is compressed as piston moves to the top of the cylinder
3. combustion - spark plug ignites the mixture and piston moves to the bottom of the cylinder
4. exaust - exaust valve(s) open and gases are forced out as piston moves to the top of the cylinder There is a lot more to this but I hope I pointed you in the right direction.
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