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Acl race series main bearing set bmw m20 m50 m52 m54
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1538h l
1538h u
1539h l
1539h u

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The ACL Race Series Main Bearing Set for BMW M20, M50, M52, and M54 engines is built for people who expect their straight-six to take punishment—and come back asking for more. These engines are known for their smoothness and reliability, but once you start adding power, extending RPMs, or pushing through long track sessions, the factory bearings start to feel the strain. That’s where ACL’s Race Series bearings step in, giving you the kind of strength and stability that keeps everything spinning smoothly under serious pressure.

Each bearing is made using ACL’s trusted tri-metal construction. A hardened steel backing provides rigidity, a copper-lead core handles the load, and a precision overlay maintains a steady oil film even under high heat. This layered design reduces friction, keeps oil pressure consistent, and helps balance crank rotation through aggressive driving or sustained high-speed runs.

The material and design come straight from motorsport applications, tested in engines that live at redline. With exceptional fatigue strength and tight, consistent clearances, these bearings deliver reliable oil control and temperature stability even under constant stress. It’s the kind of upgrade you install once and trust every time you push your car to its limits.

Installation is straightforward. ACL designed these bearings as a direct-fit upgrade for BMW’s M20, M50, M52, and M54 engines—no machining or modification needed. Everything fits with factory precision but carries the endurance of race-ready construction.

For those building or rebuilding engines found in the E30, E36, E39, E46, or Z3/Z4, ACL Race Series bearings are more than just insurance—they’re the foundation for confidence. From street builds to track-prepped machines, they keep your BMW’s bottom end strong, cool, and perfectly balanced, no matter how hard you drive.

ADDITIONAL INFORMATION:

Brand

Half Type

Identical halves
Material

F780
Min. Std Shaft Size

59,971 mm / 2.3611 in
Max. Std Shaft Size

59,99 mm / 2.3618 in
Min. Std Tunnel Size

65 mm / 2.5591 in
Max. Std Tunnel Size

65,019 mm / 2.5598 in
Max Wall at Crown

2,488 mm / 0.0980 in
Max Overall Length

20 mm / 0.7874 in (1538H)
24,94 mm / 0.9819 in (1539H(F)

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 Main Bearing Set BMW M20 M50 M52 M54
ACL Race Series Main Bearing Set BMW M20 M50 M52 M54
339.99€