What Are the Different Parts of a 4-Stroke Engine?

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Posted: 4/29/2020 by Nikki Smith | with 0 comment(s)

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: 

  • Piston 
  • Crankshaft 
  • Camshaft 
  • Spark plug 
  • Cylinder
  • Valves 
  • Carburetor 
  • Flywheel
  • 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. 

Contact Prime Source Parts and Equipment Today

At Prime Source Parts and Equipment, we offer product support solutions and are dedicated to helping our customers find just the right parts. With our vast network of suppliers, we have unparalleled access to the best parts available.

If you are looking for small engine parts or services, contact us today. Our expert staff and technicians will help you determine exactly what solutions will work best for your needs. 

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