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Acl race series connecting rod bearing set bmw b46 b48
Acl race series connecting rod bearing set bmw b46 b48 - image 2
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The ACL Race Series Connecting Rod Bearing Set for BMW B46 and B48 engines is engineered for high-performance and tuned applications where precision and durability matter. These bearings are built to handle elevated cylinder pressures, increased RPM, and sustained load—conditions that quickly expose weaknesses in OEM components.

Each bearing uses tri-metal construction with hardened steel backing, a copper-lead intermediate layer, and a precision overlay for excellent fatigue strength and oil control. This structure maintains a stable oil film under extreme pressure, minimizing friction and wear across the rod journal even at high temperatures.

ACL’s proprietary RACE Series material delivers improved embeddability and resistance to seizure, allowing tighter clearances and consistent oil pressure throughout the rev range. The result is predictable, repeatable performance—ideal for engines running higher boost, aggressive timing, or frequent track use.

Designed as a direct-fit replacement for BMW B46/B48 engines found in models like the 320i, 330i, X1, and X3, installation is straightforward with OEM-level geometry and sizing. No modifications, no compromises—just precise fitment and consistent performance under load.

In short, ACL Race bearings are a critical upgrade for builders who value reliability at the limits. They keep the rotating assembly stable, protect against oil film breakdown, and provide the durability margin every performance-focused B46/B48 build deserves.

ADDITIONAL INFORMATION:

Brand

Half Type

Upper & lower
Material

F781
Min. Std Shaft Size

49,975 mm / 1.9675 in
Max. Std Shaft Size

49,992 mm / 1.9682 in
Min. Std Tunnel Size

53,6 mm / 2.1102 in
Max. Std Tunnel Size

53,619 mm / 2.1110 in
Max Wall at Crown

1,793 mm / 0.0706 in
Max Overall Length

19,55 mm / 0.7697 in

PREPREG is a common term for a reinforcing fabric such carbon which has been pre-impregnated with a resin system. This resin system (typically epoxy) already includes the proper curing agent. As a result, the prepreg is ready to be laid into the mold without the addition of any more resin. In order for the laminate to cure, an autoclave production process is used, a combination of high pressure and heat.

  • Maximum strength and performance characterictics. In a hand layup production process, it is difficult to achieve 50% fabric and 50% resin content.  Typical hand laminates, even when vacuum bagged, end up with a significant amount of excess resin. Excess resin increases brittleness and reduces overall strength properties. On the other hand, most prepregs contain around 35% resin. This is ideal for maximum cured properties and generally impossible to achieve in normal hand lamination.
  • Uniformity and repeatability. The prepreg is of uniform thickness and each part coming out of the mold may theoretically be the same. Vacuum bagging technology may have some errors in processing, but prepreg ensures production consistency.
  • Reduce curing time. After the thermal curing cycle, no need to wait for the standard 48 hours can be fully cured.
  • Aesthetics. Although prepreg processing still requires mold preparation and demoulding, prepreg processing eliminates air bubbles, makes it easier to obtain a smooth, glossy surface as well as eliminates any seaming lines.

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We offer free tracked shipping on all orders within mainland EU. Orders to remote areas such as Malta, Cyprus, and Iceland may incur a surcharge. Worldwide shipping is also available—please contact us for a quote.

Most orders dispatch within one business day (Monday to Friday). EU delivery takes 3–5 working days from dispatch, and tracking details will be provided via email once your order has shipped.

Please note that import taxes may apply outside the EU, and these are the responsibility of the buyer. Some items may ship directly from our suppliers and may have varying delivery times. If an item is out of stock, we will contact you to discuss the available options.

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RETURNS

Changed your mind? You can return unused, uninstalled items in original packaging within 30 days of delivery. Return shipping is the customer’s responsibility unless the item is faulty.

Custom, used, or built-to-order items are non-returnable.

Once we receive and inspect your return, refunds are typically processed within 10 business days.

If your item is damaged or incorrect, contact us within 48 hours with photos and order details.

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WARRANTY

All VA and VA Motorsports products come with a 1-year limited warranty covering manufacturing defects and fitment issues. For third-party items, warranty terms vary by brand—please check the product listing or contact us for details.

This warranty does not cover wear and tear, incorrect installation, cosmetic damage, labor, or third-party costs.

To start a claim, email us with your order number, issue description, and photos. If the claim is approved, we’ll offer a replacement, store credit, or a refund.

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ACL Race Series Connecting Rod Bearing Set BMW B46 B48
ACL Race Series Connecting Rod Bearing Set BMW B46 B48
239.99€