A cylinder sleeve (also called cylinder liners or engine sleeves) is a cylindrical metal engine component that protects an engine’s bore and can be used to create bore dimensions after an engine has been over-bored or modified. Cylinder sleeves also assist in transferring heat from the piston to the coolant (if you are running a wet sleeve). The standard material for a stock cylinder sleeve is Class 30 gray iron (ASTM A48). Class 30 gray iron is a highly versatile material with good hardness characteristics, but it lacks toughness and tensile strength.

Ductile iron is the preferred material for high-performance engine sleeve applications due to its improved tensile strength, yield strength, and elongation. We here at PowerBore produce high-performance cylinder sleeves to the 100-70-03 ductile iron specifications (ASTM A536). This material is made to withstand your highest horsepower and cylinder pressure applications.

We also have our own proprietary Power Ductile material, which exceeds even the material properties of 100-70-03 ductile iron.

Whatever your application and whatever your engine type, we can produce a custom cylinder sleeve that will put you in a position to get the best possible performance out of your engine.