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ACL Engine Bearings 4B1490HX-STD Standard Size High Performance Rod Bearing Set 91-98 BMW 4 1796cc-1897cc - 4B1490HX-STD
ACL Engine Bearings 4B1490HX-STD Standard Size High Performance Rod Bearing Set 91-98 BMW 4 1796cc-1897cc - 4B1490HX-STD - Image 2 ACL Engine Bearings 4B1490HX-STD Standard Size High Performance Rod Bearing Set 91-98 BMW 4 1796cc-1897cc - 4B1490HX-STD - Image 2

If you're looking to push your BMW's performance to the next level, you might want to check out the ACL Race Series Engine Bearings. These aren’t just any bearings; they’re engineered for the kind of high RPM action that gets your heart racing. With a unique blend of design, metallurgy, and solid engineering, these bearings are built to handle the demands of serious drivers.

What sets these bearings apart? For starters, the high-strength overlay plate is thinner, which actually boosts its fatigue resistance. This means you can rev higher without worrying about wear and tear. Plus, the hardened steel backs on the rod bearings provide solid support for the lining, ensuring they stay put in the housing even under the most intense conditions.

And let’s talk about crush—these bearings have increased crush for better retention. No one wants to deal with bearings that can slip or move around, especially when you’re pushing the limits. ACL has also eliminated flash plating on the back of the bearings, which helps with heat transfer. This little tweak maximizes grip between the bearings and their housing, keeping everything cool and secure.

One of the key features is the increased eccentricity, which compensates for any distortion in the bore when you're hitting those high RPMs. This helps form hydrodynamic oil films that keep your engine running smoothly. The 3/4 grooved main bearings are designed to optimize the load-carrying surface area and improve oil flow to the conrod bearings, which is crucial for performance.

With tight, consistent wall tolerances, you can maintain those clearances that are so important for engine health. And if you’re working with performance crankshafts, the enlarged ID chamfers on the bearing edges accommodate large fillet radii, so you don’t have to worry about fitment issues.

Specifications:

  • Size: Std
  • Oil Clearance: +0.001 Extra"
  • Half Type: Upper & Lower
  • Material: Tri-metal Hardened Steel Backs
  • Min Std Shaft Size: 1.7707" (44.975mm)
  • Max Std Shaft Size: 1.7713" (44.991mm)
  • Min Std Tunnel Size: 1.8898" (48.000mm)
  • Max Std Tunnel Size: 1.8904" (48.016mm)
  • Max Wall at Crown: Std-0: 0.0583" (1.481mm)
  • Max Overall Length: 0.709" (18.00mm)

For BMW enthusiasts with engines in the 1796cc-1897cc range from '91 to '98, this standard size high-performance rod bearing set with extra oil clearance is a solid choice. It’s all about keeping your engine running at its best, and these bearings are a critical part of that equation.

Other Part Numbers:
ACL #acl4B1490HX-STD

Proposition 65

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

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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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