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ACL Race Series Main Bearing Set BMW M40 M42 M43 M44
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.
FEATURES
- High-strength overlay plate: Engineered with a reduced-thickness overlay for improved fatigue resistance, ideal for the sustained RPM and heat loads common in BMW’s M40–M44 engines.
- Hardened steel backing: Every bearing includes a hardened steel back to strengthen the bearing lining and improve housing support—critical for keeping the rotating assembly stable under load.
- Enhanced crush for secure fitment: Designed with increased crush to ensure firm retention in the housing, maintaining alignment and oil clearance during high-RPM operation.
- No flash plating: The removal of flash plating from the bearing backs enhances heat transfer, helping manage engine temperatures and improving grip between the bearing and housing.
- Optimized eccentricity: Developed to offset bore distortion at high RPM, improving oil film formation and ensuring consistent lubrication throughout the crank’s rotation.
- 3/4 grooved main bearings: Balances surface area and oil flow, delivering optimal lubrication to the connecting rod bearings for smooth operation and reduced wear.
- Precision wall tolerances: Tight and consistent tolerances ensure even oil clearances across all journals, maintaining reliability under variable thermal and load conditions.
- Enlarged ID chamfers: Machined with enlarged inner-diameter chamfers to accommodate the larger fillet radii of performance or aftermarket crankshafts, ensuring proper fit and durability in tuned applications.
APPLICATIONS
- 1988–1994 BMW M40B16 E30 316i
- 1990–1994 BMW M40B16 E36 316i
- 1987–1994 BMW M40B18 E30 318i
- 1989–1991 BMW M42B18 E30 318is
- 1992–1995 BMW M42B18 E36 318i 318is 318ti
- 1994–1998 BMW M43B16 E36 316i
- 1992–1998 BMW M43B18 E36 318i
- 1995–2001 BMW M43B18 E36/7 Z3 1.8
- 1998–2001 BMW M43B19 E46 318i 318Ci
- 1999–2002 BMW M43B19 E36/8 Z3 1.9
- 1996–1998 BMW M44B19 E36 318is 318ti
- 1996–1999 BMW M44B19 E36/7 Z3 1.9
NOTES
Specifications for STD size only.
Includes upper and lower bearing shells for a complete main bearing replacement.
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) |
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.
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.
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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