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Acl race series main bearing set bmw m40 m42 m43 m44
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1538h l
1538h u
1539h l
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ACL Race Series Main Bearing Set BMW M40 M42 M43 M44

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289.99€

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The ACL Race Series Main Bearing Set for BMW M40, M42, M43, and M44 engines is built for those who push beyond factory limits. These classic BMW four-cylinders love to rev, but once tuning, compression, or heat start rising, the stock bearings can become a weak point. ACL’s Race Series bearings are designed to take that pressure—offering strength, precision, and reliability when your engine is running at its edge.

Each bearing is made using ACL’s proven tri-metal design: a hardened steel backing for rigidity, a copper-lead core for strength under load, and a precision overlay that maintains a consistent oil film under heat and high pressure. This construction keeps friction low and oil control steady, protecting your crankshaft and block even through long high-RPM sessions or track use.

These bearings use materials trusted in motorsport engines worldwide, offering outstanding fatigue resistance, smooth clearances, and dependable oil pressure under sustained load. The result? Consistent lubrication, balanced temperatures, and long-term stability—exactly what you need when the engine is asked to perform day after day.

Installation is simple. ACL designed these bearings as a direct-fit upgrade for BMW’s M40, M42, M43, and M44 engines—no machining, no modifications. Just clean fitment with factory geometry and the strength of competition-grade materials.

For anyone restoring, tuning, or racing these classic BMW engines, ACL Race Series bearings bring peace of mind. They reinforce the bottom end, keeping the rotating assembly stable and your engine smooth, cool, and confident—mile after mile, lap after lap.

ADDITIONAL INFORMATION:

Brand

Half Type

Upper & lower
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 M40 M42 M43 M44
ACL Race Series Main Bearing Set BMW M40 M42 M43 M44
289.99€