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Acl race series connecting rod bearing set bmw m20 m50 m52 m54
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The ACL Race Series Connecting Rod Bearing Set for BMW M20, M50, M52, and M54 engines is built for engines that work hard and refuse to quit. Stock bearings are fine for everyday use, but when you raise boost, extend RPMs, or chase consistent power lap after lap, they can quickly show their limits. These ACL bearings are made for that extra margin—the kind that keeps your bottom end together when the pressure’s on.

Each bearing uses tri-metal construction with a hardened steel backing for strength, a copper-lead intermediate layer for load support, and a precision-finished overlay that holds a stable oil film even under high stress. That layered structure helps control friction and temperature while keeping oil pressure consistent across all cylinders. The result? A smoother, more predictable engine that can handle the heat of aggressive tuning or extended track sessions.

ACL’s Race Series material is proven in competition engines around the world. It offers excellent fatigue strength, strong embeddability, and resistance to wear or seizure. These bearings run tight and true, supporting stable clearances and reliable lubrication through every heat cycle.

Designed as a direct-fit replacement for BMW’s legendary straight-six engines—found in models like the E30, E36, E39, E46, and Z3/Z4—they install cleanly without modification. The geometry matches OEM spec for seamless assembly, giving you confidence that everything bolts up right the first time.

If you’re building a street-tuned 325i, restoring a 530i, or prepping an E36 for weekend track duty, the ACL Race bearings are a smart, proven choice. They reinforce the heart of your engine so you can push harder, rev higher, and drive with the confidence that it’ll hold together every time.

ADDITIONAL INFORMATION:

Brand

Half Type

Identical halves
Material

F781
Min. Std Shaft Size

44,975 mm / 1.7707 in
Max. Std Shaft Size

44,991 mm / 1.7713 in
Min. Std Tunnel Size

48 mm / 1.8898 in
Max. Std Tunnel Size

48,016 mm / 1.8904 in
Max Wall at Crown

1,49 mm / 0.0587 in
Max Overall Length

18 mm / 0.7087 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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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 M20 M50 M52 M54
ACL Race Series Connecting Rod Bearing Set BMW M20 M50 M52 M54
149.99€