![]() ![]() ![]() The heat and expanding gases from this miniexplosion push the piston down in the cylinder.Īlmost all of today's internal-combustion engines (to keep it simple, we'll focus on gasoline powerplants here) are of the four-stroke variety. Each time the fuel ignites is called the combustion, or power, stroke. What powers those pistons up and down are thousands of tiny controlled explosions occurring each minute, created by mixing fuel with oxygen and igniting the mixture.
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