ACL BMW M3 (E90) S65 V8 Engine Standard Size High Performance Rod Bearing Set

Engineered specifically to address one of the S65’s most well-known weak points, this ACL rod bearing set is a proven solution for enthusiasts who demand long-term reliability, whether the car is driven hard on track or enjoyed on the street. Built using advanced tri-metal bearing technology, these bearings are designed to handle sustained high RPM, elevated loads, and aggressive driving conditions with confidence.

At the core of this set is ACL’s lead/copper tri-metal construction, widely regarded as the gold standard in high-performance engine bearings. A hardened steel backing is layered with copper for strength, then topped with a soft lead overlay that provides excellent embeddability. This allows small debris to be absorbed into the bearing surface without damaging the crankshaft, significantly reducing the risk of catastrophic failure.

Key Features

• Tri-Metal Lead/Copper Design
  Hardened steel backing with copper and lead overlay for superior load capacity, embeddability, and wear resistance.

• High-Strength Overlay Plate
  Reduced overlay thickness improves fatigue resistance under high RPM and sustained load.

• Hardened Steel Bearing Backs
  Enhances bearing support and retention within the rod housing.

• Increased Crush
  Improves bearing stability and prevents bearing movement during extreme operation.

• No Flash Plating on Bearing Backs
  Maximizes heat transfer and improves grip between the bearing and housing.

• Increased Eccentricity
  Compensates for bore distortion at high RPM and supports consistent hydrodynamic oil film formation.

• Tight, Consistent Wall Tolerances
  Ensures accurate oil clearances for reliable oil pressure and long engine life.

• Enlarged ID Chamfers
  Designed to accommodate large crankshaft fillet radii commonly found in performance applications.

Why Choose ACL Rod Bearings for the S65?

The S65’s high rev limit and tight factory clearances place extreme demands on the bottom end. ACL’s tri-metal rod bearings are engineered to withstand these conditions, offering improved protection against premature wear and failure. Precision manufacturing and race-proven materials make this set an essential upgrade for any S65 engine build focused on durability, performance, and peace of mind.

An ideal choice for preventative maintenance or performance-oriented rebuilds, these rod bearings are built to perform when it matters most.