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How a car engine works? |
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The engines in most cars are classified as four-stroke reciprocating internal combustion engines because they use a four-stroke combustion cycle to convert gasoline into motion.The four strokes, or stages, of the cycle are: Intake stroke, Compression stroke, Combustion stroke, Exhaust stroke.
- Intake stroke
The piston starts at the top, the intake valve opens, and the piston moves down to let the engine draw in a cylinder-full of a mixture of air and gasoline. The intake valve then closes, trapping the mixture in the cylinder.
- Compression stroke
The piston moves back up to compress the air and gasoline mixture to about one-tenth of its original volume. Compression makes the explosion more powerful.
- Combustion stroke
When the piston reaches the top of its stroke, the spark plug emits a spark to ignite the gasoline. The gasoline in the cylinder explodes, expanding and driving the piston down with great force. This turns the crankshaft to power the vehicle.
- Exhaust stroke
Once the piston is at the bottom again, the exhaust valve opens. The piston returns to the top, pushing the burned exhaust gas from the explosion out of the cylinder into the tail pipe.
And then the process repeats itself.
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