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A 4-stroke engine is a type of small internal combustion engine that uses four different piston strokes to complete one operating cycle. During this cycle, the crankshaft rotates twice while the piston goes up and down twice to fire the spark plug.
4-Stroke Engine Parts List
The parts of a 4-stroke small engine include:
- Spark plug
- Connecting rod
- Fuel injectors
Cycles of a 4-Stroke Engine
Here is a breakdown of the parts and functions of a 4-stroke diesel engine.
1. Intake Stroke
Small engines get fuel and air through the carburetor. The carburetor then combines the fuel and air for combustion. During the intake stroke, the intake valve between the combustion chamber and the carburetor opens, which allows atmospheric pressure to push the fuel-air mixture into the cylinder as the piston moves downward.
2. Compression Stroke
Both the intake and exhaust valves are closed in the compression stroke. As the piston moves upward, it compresses the fuel-air mixture. The compression makes it easier for the spark plug to ignite the fuel-air mixture in the power stroke.
3. Power Stroke
Once the piston gets to the top, it is at the optimum point to ignite the fuel. The spark plug creates the high voltage needed for ignition. The heat that is created by the spark ignites the gas, which then forces the piston back down in the cylinder.
4. Exhaust Stroke
Once the piston reaches the bottom, the exhaust valve opens. As the piston moves back up, it forces the exhaust gases out of the cylinder. Once the piston reaches the top, the exhaust valve closes again. The intake valve reopens, and the 4-stroke process is repeated.
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