ACL Race Series Main Bearings #5 Thrust | 2002-2021 Subaru WRX/STi EJ-Series (5M8309H)

ACL Race Series Main Bearings

The unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high performance Trimetal engine bearings.

Features

• Designed to withstand higher RPM conditions.
• High strength overlay plate with reduced thickness for improved fatigue properties.
• Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
• Increased crush for improved bearing retention.
• Elimination of flash plating on the back of the bearings to improve heat transfer through the bearing sand to maximize the grip between the bearings and its housing.
• Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
• 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.
• Tight consistent wall tolerances to help you maintain consistent clearances.
• Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts.

Applications

• Subaru EJ-Series Engines with #5 Thrust Bearing
• 2002-2014 WRX
• 2004-2021 STI
• 1992-2017 Impreza
• 1989-2020 Legacy

What's In The Box?

• (1) Complete Set of Main Bearings

Warranty

• Manufacturer Standard Warranty