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A four-stroke cycle engine is a common type of internal combustion engine that operates with four basic steps: intake, compression, power, and exhaust.
1. Intake: The intake valve opens, and a mixture of fuel and air is drawn into the cylinder as the piston moves down.
2. Compression: The intake valve closes, and the piston moves back up the cylinder, compressing the fuel-air mixture.
3. Power (Combustion): When the piston reaches the top of the cylinder, the spark plug ignites the fuel-air mixture. This causes a mini explosion, and the resulting energy pushes the piston back down.
4. Exhaust: The exhaust valve opens, and as the piston moves back up, it pushes the waste gases out of the engine.
This whole process then repeats itself. The four stroke engine is quiet and smooth in operations, more fuel efficient, and less polluting compared to two-stroke engines. Used in most types of cars, buses, trucks, and motorbikes.
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