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There are 4 strokes to your average everyday gasoline engine. As well as other little moving parts

  • Fuel/Air Valve Opens at the top of this stroke (highest point the piston will go)
  • Stroke 1 : draws in the fuel/air mixture
  • Fuel/Air Valve Closes at the bottom of this stroke (lowest point for the piston)
  • Stroke 2 : compresses the mixture to maximize the explosion
  • Spark plug ignites at the top of the stroke
  • Stroke 3 : this is where the internal combustion comes from, the explosion sends the piston downard and cranks the shaft that connects them all.
  • Exhaust Valve Opens at the bottom of this stroke
  • Stroke 3 : piston is powered by the other pistons to send the piston back up to push out the exhaust fumes
  • Exhaust Valve closes, Fuel air opens to repeat the cycle.

The initial combustion is achieved by the starter motor manually cranking the engine to force the pistons into action, think about some old timey looney toons cartoon when you see someone out in front of their car turning some sort of crank, that's what the starter does so you don't have to get out when you want to start it.

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13y ago

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