ACL Bearings 5M8309HOS2-STD Race Series Main Bearing Set for Subaru EJ20/EJ22/EJ25

The ACL Bearings 5M8309HOS2-STD is a high-performance Race Series main bearing set designed specifically for Subaru EJ20, EJ22, and EJ25 engines with thrust bearing in the #5 position. This standard size bearing set features ACL's advanced H-Series construction with dual thrust bearings for enhanced load capacity in performance applications.

Key Features:

• Tri-metal construction with hardened steel backing for maximum strength and bearing retention
• High-strength overlay plate with reduced thickness for improved fatigue resistance
• Increased eccentricity to compensate for bore distortion at high RPM
• Dual thrust bearing design (HOS2 configuration) for improved thrust load handling
• 3/4 grooved design to optimize bearing load surface area and oil flow
• No flash plating on backing for improved heat transfer and housing grip
• Standard bearing size compatible with factory crankshaft journals

Technical Specifications:

• Bearing Material: Tri-Metal 77 (copper-lead alloy layer with steel backing and electroplated babbitt overlay)
• Journal Size: 59.984-60mm (2.3616-2.3622 inches)
• Housing Size: 64.051-64.071mm (2.5217-2.5225 inches)
• Vertical Oil Clearance Range: 0.01-0.03mm (0.0003937-0.0011811 inches)
• Wall Thickness at Crown: 2.03mm (0.0799 inches)
• Overall Length: 19mm (0.748 inches)

ACL Race Series bearings are engineered to withstand higher RPM conditions and are ideal for performance builds, turbo applications, and racing engines. The H-Series design combines superior material properties with optimized geometry to deliver exceptional durability and performance where standard bearings cannot.