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SBTís sleeves are an economical solution for repairing cylinder blocks back to OEM specifications. SBTís jet ski sleeves are made of a proprietary cast iron alloy and are centrifically-cast. They are identical to the sleeves used in SBTís remanufacturing process.
There are two types of sleeves: centrifugal spun cast iron and poured cast iron. Poured cast iron is simply poured into a cylinder casting mold. This type of jet ski sleeve is usually more prone to weakness and porosity. The spinning method used to create centrifugal spun cast iron draws out impurities and air pockets from the raw casting materialís center to the outer surface, which is then removed. The end product is a sleeve material that is greater in micro-structure and density. The jet ski sleeve will then withstand greater loads without losing cylindrical roundness or shape.
Another advantage of SBTís cast iron sleeves is that they wear longer and are more resistant to overheating than aluminum liners.