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  See more parts for Subaru Forester
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ACL Subaru EJ20/EJ22/EJ25 0.50mm Oversized High Performance Main Bearing 5M8309H-0.50 - 5M8309H-.50
ACL Subaru EJ20/EJ22/EJ25 0.50mm Oversized High Performance Main Bearing 5M8309H-0.50 - 5M8309H-.50 - Image 2

ACL 5M8309H-.50 High Performance Main Bearing

The ACL 5M8309H-.50 is engineered specifically for high-performance applications, designed to meet the demands of Subaru engines, particularly in the EJ20, EJ22, and EJ25 configurations. This 0.50mm oversized main bearing is crafted to deliver enhanced durability and reliability under extreme conditions, making it an essential upgrade for serious automotive enthusiasts.

Key Features

  • Tri-metal Construction: The bearing features a high-strength overlay plate that minimizes thickness, improving fatigue resistance and overall performance.
  • Hardened Steel Backs: All rod bearings come with hardened steel backs, providing superior support for the bearing lining and ensuring secure retention within the housing.
  • Optimized Crush Design: Increased crush enhances bearing retention, ensuring stability during high RPM operations.
  • Improved Heat Transfer: The elimination of flash plating on the back of the bearings promotes better heat dissipation and maximizes grip between the bearing and housing.
  • Enhanced Eccentricity: Increased eccentricity compensates for bore distortion at high RPM, facilitating the formation of hydrodynamic oil films for superior lubrication.
  • 3/4 Grooved Design: This design optimizes the load-carrying surface area and improves oil flow to the connecting rod bearings, which is critical for performance applications.
  • Consistent Wall Tolerances: Tight tolerances ensure that you maintain precise clearances, which are vital for engine performance.
  • Chamfered Edges: Enlarged ID chamfers accommodate larger fillet radii on performance crankshafts, enhancing compatibility and fitment.

Specifications

  • Size Options: STD, .025, .25, 0.5
  • Oil Clearance: Standard
  • Half Type: Identical Halves
  • Material: Tri-metal with Hardened Steel Backs
  • Min Standard Shaft Size: 2.3616 in / 59.984 mm
  • Max Standard Shaft Size: 2.3622 in / 60.000 mm
  • Min Standard Tunnel Size: 2.5194 in / 64.000 mm
  • Max Standard Tunnel Size: 2.5205 in / 64.020 mm
  • Max Wall at Crown: 0.0789 in / 2.005 mm
  • Max Overall Length: 0.748 in / 19 mm

Fitment

This main bearing is confirmed to fit the following Subaru models:

  • Subaru Forester (1998-2017)
  • Subaru Impreza (1993-2017)
  • Subaru Legacy (1990-2017)
  • Subaru WRX (2002-2022)

Other Part Numbers:
ACL #acl5M8309H-.50

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
1998-2017
 Subaru Forester
1993-2017
 Subaru Impreza
1990-2017
 Subaru Legacy
2002-2022
 Subaru WRX

ACL Banner

Who is ACL?

ACL is a company that specializes in manufacturing and distributing high-quality engine bearings that have played a key role in the Australian automotive parts market. 

Based in Launceston, Tasmania, Australia, the company has been in the business for more than 70 years and has become the leading brand when it comes to its market segment.

Throughout the years, ACL has consistently provided top quality products and has become the equipment supplier of multiple Automotive brands such as Lancia, Mazda, Mini, Mitsubishi, Nissan, Peugeot, Subaru, Toyota, Volvo, Suzuki, Renault, SAAB, and more.  ACL also provides a replacement product range used by the aftermarket industry.

The company ensures that it maintains its high level of standard by employing manufacturing processes that are ISO certified. They also use the industry’s most advanced tooling equipment and designing software that allows them to create products that are superior in quality. ACL has been known worldwide to create bearings that are durable, innovative, and precise.

ACL also offers bearing used for high-performance applications. The company has been involved in motorsport racing since the 1960s and has manufactured bearings used in Brabham Formula 1. Today, their products are being used in different racing disciplines such as the Australian Supercar Championship, Drag racing, Driftings, and Rally.

Purchase ACL Bearings at Vivid Racing

Engine Bearings are a critical component of a vehicle and should not be overlooked. If you want to make sure that what you get is something you could rely on, then ACL is the brand for you. With over 200 engine applications, whether it’s an American, Australian, European, or Asian made vehicle, ACL got you covered. Visit Vivid Racing and check out their list of bearings that would fit your specific needs.

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