ACL Bearings 5M1112H-STD Race Series Tri-Metal Main Bearings Set

The ACL Race Series 5M1112H-STD main bearing set delivers high-performance tri-metal construction engineered for demanding racing applications. This complete set includes 6 x 1112H and 4 x 1113H upper and lower bearing shells, providing the precision and durability required for high-RPM engine builds.

Advanced Tri-Metal Construction:

ACL Race Series bearings combine precision metallurgy with race-proven engineering to withstand extreme conditions. The unique tri-metal design provides superior fatigue resistance and load-carrying capacity for 4, 6, and 8 cylinder performance engines.

Key Performance Features:

• High-strength overlay plate with optimized thickness for enhanced fatigue resistance and longevity under extreme loads
• Hardened steel backing on all bearings improves lining support and ensures positive bearing retention in the housing
• Increased crush design for superior bearing retention and stability at high RPM
• No flash plating on bearing backs maximizes heat transfer and improves grip between bearing and housing bore
• Increased eccentricity compensates for bore distortion at high RPM and promotes optimal hydrodynamic oil film formation
• 3/4 groove configuration on main bearings optimizes load-carrying surface area while maintaining proper oil flow to connecting rod bearings
• Tight wall tolerances ensure consistent bearing clearances for reliable engine assembly and performance
• Enlarged ID chamfers accommodate large fillet radius on performance crankshafts where required

Designed specifically for race and high-performance street applications where standard bearings cannot withstand the increased loads, temperatures, and RPM demands of modified engines.