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A combustion engine, often referred to as an internal combustion engine, operates on the principle of burning or combusting fuel inside a confined space (the combustion chamber). This burning process produces high pressure gases that push a piston, which in turn moves the crankshaft. This movement is eventually used to move the wheels of a car. Here's a more detailed step-by-step breakdown:
1. Intake Stroke: The first stroke in a four-stroke combustion engine is the intake stroke. The intake valve opens, and fuel and air are pulled into the combustion chamber while the piston moves down.
2. Compression Stroke: As the piston moves back up, it compresses the fuel-air mixture, causing its potential energy to increase. At this stage, both valves (intake and exhaust) are closed.
3. Combustion Stroke: Just as the piston reaches the top, the spark plug emits a spark to ignite the compressed fuel. This causes an explosion that forces the piston back down the cylinder.
4. Exhaust Stroke: After the combustion, the exhaust valve opens. As the piston moves back up again, it pushes the resulting gas out of the cylinder.
The cycle then begins again. The energy created by the internal combustion engine converts chemical energy from the fuel into mechanical energy which can then drive the wheels of a car.
Please note that this is a simplified explanation. Many other parts like the timing belt, oil pumps, water pumps, etc. work together to keep a car engine running smoothly. In addition, modern engines incorporate technologies such as fuel injection and computer controls for more efficient operation.
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