A two-stroke petrol engine works by converting fuel into motion through two piston strokes in one crankshaft rotation:
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UpstrokeThe piston rises, compressing the air-fuel mixture in the combustion chamber and igniting it with the spark plug.
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Downstroke
The piston is pushed down by the ignited fuel, expelling exhaust and opening the inlet port to allow fresh air into the chamber.
Here are some more things to know about two-stroke engines:
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Fewer moving parts
Two-stroke engines have fewer moving parts than four-stroke engines, which makes them easier to maintain and cheaper to manufacture.
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Higher power-to-weight ratio
Two-stroke engines have a higher power-to-weight ratio than four-stroke engines because their power stroke occurs twice as often.
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Gas movement through ports
Two-stroke engines don’t have valves, so gas moves through ports in the cylinder.
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Use in different vehiclesTwo-stroke engines are popular in mopeds and motorcycles in regions with less stringent emissions regulations. They are also used in power tools like chainsaws and leaf blowers.
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