ACL Bearings 5M8309HXOS2-STD Race Series Main Bearing Set for Subaru EJ Engines

ACL Race Series main bearing set designed for Subaru EJ18, EJ20, EJ22, and EJ25 engines with thrust bearing in position #5. This set features tri-metal F780 bearing material with identical bearing halves in standard size. The HXOS2 designation indicates Race Series construction with additional oil clearance for high-performance applications.

Key Features:

• High strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backs to improve bearing lining support and retention in the housing
• Increased crush for improved bearing retention
• Elimination of flash plating on bearing backs to improve heat transfer and maximize grip
• Increased eccentricity to compensate for bore distortion at high RPM
• 3/4 grooved main bearings to optimize load carrying surface area and oil flow
• Tight consistent wall tolerances for maintaining precise clearances
• Enlarged ID chamfers on bearing edges to accommodate large fillet radius on performance crankshafts

Technical Specifications:

• Shaft size range: 59.984mm to 60mm (2.3616" to 2.3622")
• Tunnel size range: 64.051mm to 64.071mm (2.5217" to 2.5225")
• Vertical oil clearance: 0.035mm to 0.055mm (0.00138" to 0.00217")
• Wall thickness at crown: 2.017mm (0.0794")
• Overall length: 19mm (0.748")
• Bearing size: Standard (STD)

ACL Race Series bearings are recognized as a premier brand throughout the motorsports world, serving as standard components in race engines that have set records and won championships. The unique combination of design, metallurgy and engineering delivers what drivers expect from high-performance tri-metal engine bearings.