How a Four-Stroke Engine Works
Turning fuel into rotation
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The Four-Stroke Engine
Most car engines are four-stroke engines. The piston repeats four strokes to turn the energy of fuel into rotation.
Inside the Engine
The piston moves up and down inside the cylinder, and the connecting rod turns that motion into the rotation of the crankshaft.
① Intake
First comes intake. The intake valve opens and the piston moves down, drawing in air and fuel.
② Compression
Second is compression. With both valves closed, the piston moves up and squeezes the mixture.
③ Power
Third is the power stroke. A spark from the spark plug ignites the mixture, and the pressure drives the piston down hard.
④ Exhaust
Fourth is exhaust. The exhaust valve opens, and the rising piston pushes out the burned gas.
One Cycle in Two Turns
The four strokes each happen once while the crankshaft turns twice. Repeating this cycle keeps the engine running.
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