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Acl race series main bearing set bmw n54 n55

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ACL Race Series Main Bearing Set BMW N54 N55

399.99€

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WORLDWIDE SHIPPING

EASY RETURNS

SECURE SHOPPING

24/7 SUPPORT

The ACL Race Series Main Bearing Set for BMW’s N54 and N55 engines is made for power builds that go well beyond factory expectations. Once boost climbs, oil temps spike, and revs stay high, the stock bearings can start to give up. ACL’s Race Series bearings step in right where they need to—offering the strength, stability, and confidence your twin-turbo straight-six deserves when it’s making serious power.

Each bearing is built using ACL’s trusted tri-metal formula: a hardened steel backing for rigidity, a copper-lead layer for load-bearing strength, and a precision overlay that keeps a steady oil film even when temperatures soar. That design controls friction and maintains stable oil pressure across every crank journal, keeping your bottom end smooth, cool, and protected through every pull and gear shift.

Proven in professional motorsport applications, ACL’s Race Series material delivers the kind of fatigue resistance and consistency that tuners and track drivers rely on. It holds clearances tight, resists wear under extreme load, and keeps oil control balanced—crucial when you’re pushing higher boost or running long sessions at redline.

Installation is clean and straightforward. These bearings are a direct-fit replacement for BMW’s N54 and N55 engines—no machining, no modifications, just perfect OEM geometry paired with race-grade durability.

If you’re running a tuned 335i, 135i, 535i, M2, or any other N54/N55-powered car that’s putting serious heat through its crank, these bearings are your safeguard. They reinforce the core of your engine, keeping it balanced and reliable through every hard launch, dyno pull, and full-throttle stretch. Once you’ve built an engine that lives on boost, ACL Race bearings aren’t just an upgrade—they’re a necessity.

FEATURES

High-strength overlay plate: Designed with a reduced-thickness overlay to improve fatigue resistance and withstand the extreme loads of high-boost and high-RPM N54/N55 engines.
Hardened steel backs: All main bearings feature hardened steel backing to enhance structural support, improve bearing retention, and maintain stability under heavy load.
Increased crush: Provides a tighter fit in the housing for improved bearing retention, ensuring the shells stay firmly seated even under extreme cylinder pressure.
No flash plating: Eliminating flash plating on the back of the bearings enhances heat transfer and maximizes grip between the bearing and its housing for better thermal management.
Optimized eccentricity: Increased bearing eccentricity helps compensate for bore distortion at high RPM, aiding the formation of a strong, stable hydrodynamic oil film.
¾-grooved main bearings: Improves oil flow to connecting rod bearings while maintaining optimal load-carrying surface area for better crankshaft support.
Consistent wall tolerances: Manufactured to extremely tight wall thickness tolerances for precise clearances and uniform oil pressure throughout the engine.
Enlarged ID chamfers: Features enlarged internal chamfers where necessary to accommodate large crankshaft fillet radii found in high-performance and forged applications.

Acl structure

APPLICATIONS

2007–2010 BMW N54B30 E82/E88 135i
2011–2016 BMW N54B30 E82 1M Coupe
2010–2013 BMW N55B30 E82/E88 135i
2012–2016 BMW N55B30 F20/F21 M135i
2014–2018 BMW N55B30 F22/F23 M235i
2015–2018 BMW N55B30 F87 M2
2006–2010 BMW N54B30 E90/E91/E92/E93 335i
2011–2013 BMW N54B30 E92/E93 335is
2009–2013 BMW N55B30 E90/E91/E92/E93 335i
2012–2017 BMW N55B30 F30/F31 335i
2007–2010 BMW N54B30 E60/E61 535i
2009–2013 BMW N55B30 E60/E61 535i
2011–2017 BMW N55B30 F10/F11 535i
2011–2017 BMW N55B30 F07 535i GT
2012–2018 BMW N55B30 F32/F33/F36 435i
2013–2018 BMW N55B30 F15 X5 sDrive35i xDrive35i
2014–2019 BMW N55B30 F16 X6 xDrive35i
2015–2019 BMW N55B30 F26 X4 xDrive35i
2011–2015 BMW N55B30 F25 X3 xDrive35i
2008–2016 BMW N54B30 E89 Z4 sDrive35i sDrive35is
2008–2010 BMW N54B30 E71 X6 xDrive35i

NOTES

Specifications for STD size only.

Includes upper and lower bearing shells for a complete main bearing replacement.

ADDITIONAL INFORMATION:

Brand	ACL
Half Type	Upper & lower
Material	F780
Min. Std Shaft Size	64,961 mm / 2.5575 in
Max. Std Shaft Size	64,98 mm / 2.5583 in
Min. Std Tunnel Size	70 mm / 2.7559 in
Max. Std Tunnel Size	70,019 mm / 2.7566 in
Max Wall at Crown	2,508 mm / 0.0987 in
Max Overall Length	19,85 mm / 0.7815 in (1397H) 18,85 mm / 0.7421 in (1398H) 24,01 mm / 0.9453 in (1399H(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.

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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