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ACL High Performance Main Bearings for Subaru EJ20/EJ22/EJ25, 0.027mm Oversized - 5M8309HOS2-.025
ACL High Performance Main Bearings for Subaru EJ20/EJ22/EJ25, 0.027mm Oversized - 5M8309HOS2-.025 - Image 2 ACL High Performance Main Bearings for Subaru EJ20/EJ22/EJ25, 0.027mm Oversized - 5M8309HOS2-.025 - Image 2

If you're diving into the world of high-performance engines, you know that the right bearings can make all the difference. That's where the ACL Race Series Engine Bearings come into play. These aren't just any bearings; they’re crafted from a unique blend of design, metallurgy, and engineering to handle the kind of RPMs that get your heart racing. Whether you're working on a 4, 6, or 8-cylinder setup, these bearings are built to last and perform under pressure.

One of the standout features is the high-strength overlay plate. It’s thinner than what you might find in standard bearings, which means it’s got better fatigue properties. This is crucial when you’re pushing your engine to the limits. Plus, the hardened steel backs on all rod bearings give you that extra support for the bearing lining, ensuring they stay put when the heat is on.

Speaking of heat, these bearings are designed with improved heat transfer in mind. They’ve eliminated the flash plating on the back, which means they can dissipate heat more effectively. This not only keeps your engine running cooler but also maximizes the grip between the bearings and their housing. And let’s not forget about increased eccentricity—this helps tackle bore distortion at high RPMs and aids in forming those all-important hydrodynamic oil films.

Now, if you’re looking at the main bearings, you’ll appreciate the 3/4 grooved design. This optimizes the load-carrying surface area and enhances oil flow to the conrod bearings, which is a big deal when you’re pushing for peak performance. And with tight, consistent wall tolerances, you can maintain those critical clearances without a hitch.

For those of you working with performance crankshafts, the enlarged ID chamfers on the bearing edges are a nice touch. They accommodate large fillet radii, ensuring everything fits together just right.

Specifications:

  • Size: STD, .025, .25, 0.5 mm
  • Oil Clearance: Standard
  • Half Type: Identical Halves
  • Material: Tri-metal Hardened steel backs
  • Min Std Shaft Size: 2.3616in / 59.984 mm
  • Max Std Shaft Size: 2.3622in / 60 mm
  • Min Std Tunnel Size: 2.5197in / 64 mm
  • Max Std Tunnel Size: 2.5205in / 64.02 mm
  • Max Wall at Crown: 0.0789in / 2.005 mm
  • Max Overall Length: 0.748in / 19 mm

For those running a Subaru EJ20, EJ22, or EJ25, the 5M8309HOS2-.025 is a solid choice for thrust in the #5 position. With a 0.027mm oversized design, you can trust these high-performance main bearings to keep your engine running smoothly and efficiently.

Other Part Numbers:
ACL #acl5M8309HOS2-.025

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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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