Parts of a Four-Stroke Engine

Save

The four-stroke motor is the heart of most modern motorcycles. Although four-stroke motors are available in different displacements and cylinder arrangements, their basic components remain the same.

Cylinder Head

  • Also referred to as the top end, the cylinder head houses the pistons, valves, rocker arms and camshafts.

Valves

  • A pair of valves, used for controlling fuel intake and exhaust, are controlled by a set of fingers on the camshaft called lobes. As the intake valve opens, a mixture of fuel and air from the carburetor is pulled into the cylinder. The exhaust valve expels the spent air/fuel mixture after combustion.

Camshaft

  • Usually chain or gear-driven, the camshaft spins, using its lobes to actuate the rocker arms. These open the intake and exhaust valves at preset intervals.

The Piston

  • The piston travels up and down within the cylinder and compresses the air/fuel mixture to be ignited by a spark plug. The combustive force propels the piston downward. The piston is attached to a connecting rod by a wrist pin.

Crankshaft

  • The crankshaft is made up of a left and right flywheel connected to the piston's connecting rod by a crank pin, which rotates to create the piston's up-and-down motion. The cam chain sprocket is mounted on the crankshaft, which controls the chain that drives the camshaft.

Transmission

  • The transmission is made up of a set of gears that convert the rotational speed of the crankshaft into torque. The transmission is engaged by the clutch and causes the engine sprocket to spin at the converted ratio, pulling the drive chain and ultimately causing the rear wheel to spin as the chain pulls the rear sprocket.

References

Promoted By Zergnet

Comments

You May Also Like

  • Parts of a 2 Stroke Engine

    While most modern motorcycles no longer use two-stroke engines, many scooters still do. A lot of outdoor power equipment (such as chainsaws...

  • The Advantages of 4 Stroke Engines

    Parts of a Four-Stroke Engine. ... Components of a 4 Stroke Petrol Engine. A four-stroke petrol engine consists of systems working together...

  • Gasoline Engine Parts & Definitions

    You May Also Like. Parts of a 2 Stroke Engine. While most modern motorcycles no longer use two-stroke engines, many scooters still...

Related Searches

Read Article

How to Clean Your Car Headlights

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!