Video from Inside a 4-Stroke Engine

(YouTube Link)

This video shows what happens inside a four-stroke engine. That's:
1. the intake stroke of the piston, reducing pressure in the cylinder and forcing gas and air inside
2. intake and exhaust valves close and the piston compresses the fuel-air mix
3. the compression and a spark result in combustion, and therefore a power stroke
4. the piston compresses, pushing out the expended fuel-air mix


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