TWIN CAM BORE SIZES AND CYLINDER WALL THICKNESS EXPLAINED

Cylinder wall thickness is the measurement of the material that makes up the walls of the engine's cylinder, which houses the piston. It is the distance between the inner surface of the cylinder, where the piston moves up and down, and the outer surface of the cylinder that interfaces with the engine block or cooling jackets.

*Importance of Cylinder Wall Thickness:*

1. *Durability:* Thicker walls can better withstand the stresses and pressures generated during engine operation, reducing the risk of cracking or deformation.

2. *Heat Management:* The thickness of the cylinder walls affects how heat is dissipated. Thinner walls can dissipate heat more quickly, but they must still be thick enough to maintain structural integrity.

3. *Performance:* Proper wall thickness helps maintain the precise shape and alignment of the cylinder, ensuring optimal performance and efficiency.

4. *Engine Longevity:* Adequate thickness ensures that the cylinder walls can endure prolonged wear and tear, contributing to the overall longevity of the engine.

Harley-Davidson engineers their engines with carefully calculated cylinder wall thicknesses to achieve a balance between strength, heat dissipation, and weight. Too thick, and the engine might become overly heavy and inefficient at heat management; too thin, and the engine might suffer from durability issues.

cylinder wall thickness
Twin cam 110
Twin cam 107
Twin cam 103
Twin cam 98
Twin cam 95
Twin cam 88