How a 4 stroke engine works

Ever wondered exactly how a 4 cycle engine works? Mechanics explain this process with 4 words:

Suck
First, the piston moves down while the intake valve is opened pulling air gas mixture into the cylinder.

Squeeze
On the way back up the air gas mixture is compressed.

Bang
A spark ignites the mixture forcing the piston back down.

Blow
This time, on the way back up, the exhaust valve opens allowing the exhaust out.