Dr. Dmitri Kopeliovich
Selection of bearing material suitable for a particular engine should be based on the following engine parameters:
Stock engines, street performance and circle track racing engines may use conventional aluminum-tin-silicon bi-metal or copper based tri-metal bearings depending on the load and crankshaft materials (AlSi bi-metal – for nodular cast iron shafts, tri-metal - for forged steel shafts).
Tri-metal bearings are recommended for off-road and off-shore racing engines (typically higher loaded applications).
High strength tri-metal materials (e.g. Sputter bearings) are recommended for applications with high bearing loading where conventional tri-metal material undergoes fatigue (for example upper conrod bearings in diesel engines with direct fuel injection).