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  See more parts for Mazda 323
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ACL Mazda 4 1597(B6) 1840cc .25mm Oversized Rod Bearing Set 90-03 - 4B8351A-.25
ACL Mazda 4 1597(B6) 1840cc .25mm Oversized Rod Bearing Set 90-03 - 4B8351A-.25 - Image 2 ACL Mazda 4 1597(B6) 1840cc .25mm Oversized Rod Bearing Set 90-03 - 4B8351A-.25 - Image 2

When it comes to pushing your engine to its limits, you need bearings that can keep up. That's where these ACL Race Series Engine Bearings come in. Designed with a unique blend of engineering and metallurgy, these bearings are built to handle the high RPMs that come with serious driving. Whether you’re racing or just want your daily driver to feel a bit more alive, these bearings are ready for the challenge.

Let’s break down what makes these bearings stand out:

  • High Strength Overlay: The overlay plate is thinner but tougher, which means it can take more stress without giving up. Perfect for those who really push their engines.
  • Hardened Steel Backs: All rod bearings have hardened steel backs that help keep everything in place. This means better support for the bearing lining and less chance of it slipping out of the housing.
  • Increased Crush: With more crush, these bearings stay put better, which is crucial for high-performance applications.
  • No Flash Plating: By eliminating flash plating on the back, heat transfer improves significantly. This helps keep your engine cool and ensures a solid grip between the bearing and its housing.
  • Increased Eccentricity: This feature compensates for bore distortion at high RPMs, which helps in forming hydrodynamic oil films—essential for smooth operation.
  • 3/4 Grooved Main Bearings: These optimize the load-carrying surface area and improve oil flow to the connecting rod bearings, which is key for longevity.
  • Tight Wall Tolerances: Consistent clearances are crucial for performance, and these bearings deliver just that.
  • Enlarged ID Chamfers: Designed to fit performance crankshafts with larger fillet radii, ensuring compatibility with your upgraded setup.

As for the specs, they’re pretty solid:

  • Sizes available: STD, .025, .25, .50
  • Oil Clearance: Standard
  • Half Type: Upper & Lower
  • Material: A mix of Aluminum, Tin, and Silicon
  • Min Standard Shaft Size: 1.7693in / 44.94 mm
  • Max Standard Shaft Size: 1.7699in / 44.956 mm
  • Min Standard Tunnel Size: 1.8896in / 47.996 mm
  • Max Standard Tunnel Size: 1.8904in / 48.016 mm
  • Max Wall at Crown: 0.0596in / 1.515 mm
  • Max Overall Length: 0.6693in / 17 mm

These bearings are a perfect fit for:

  • Mazda 323 (1986-2003)
  • Mazda Protege (1990-2003)

So if you’re looking to give your Mazda a serious performance boost, these ACL bearings could be just what you need. They’re built to last and designed for those who don’t shy away from pushing the limits.

Other Part Numbers:
ACL #acl4B8351A-.25

Proposition 65

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

Vehicle
1986-2003
 Mazda 323
1990-2003
 Mazda Protege

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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