What does '0.50mm undersize' mean for these rod bearings?

This means the bearings are manufactured to be 0.50mm smaller in diameter than standard size. They are intended for use when the engine's crankshaft journals have been machined down by 0.50mm during a rebuild or reconditioning process.

What is the material of these ACL Race Series bearings?

These bearings utilize a tri-metal material construction. This type of material is chosen for its balance of strength, conformability, and wear resistance, making it suitable for performance applications.

Do these bearings come with installation hardware?

This product listing is for the rod bearings only. Installation hardware, such as new main bearing bolts or crankshaft seals, is typically sold separately and should be replaced during engine assembly.

Specifications

Brand: ACL
Part #: 6B1584H-.50
UPC: 09315726460740

ACL BMW N54/N55/S55B30 3.0L Inline 6 Race Series Engine Rod Bearings

Name: ACL BMW N54/N55/S55B30 3.0L Inline 6 Race Series Engine Rod Bearings
Brand: ACL
SKU: acl-acl-bmw-n54-n55-s55b30-3-0l-inline-6-race-series-engine-rod-bearings-t14-703766
Price: 208.61 USD
Availability: BackOrder

$208.61

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ACL BMW N54/N55/S55B30 3.0L Inline 6 Race Series Engine Rod Bearings. Undersize 0.50mm for performance builds.

Key Features

Fits 2007-2013 BMW 135i, 335i, 335is, 535i, and Z4 models, plus 2011-2012 740i/Li and 2008-2010 X6.
Designed for high-performance BMW N54, N55, and S55B30 3.0L inline-6 engines.
Race Series bearings feature a tri-metal material for improved strength and durability.
0.50mm undersize to accommodate a machined crankshaft.
Manufactured by ACL, a well-known name in engine bearings.

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About this part

Product Details

Already running performance upgrades on your BMW N54, N55, or S55B30 engine? These Race Series rod bearings from ACL are the next piece of the puzzle for a robust build. Designed for engines that see harder use, they offer a well-built option to handle increased stress. The bearings are manufactured to tight tolerances, ensuring proper oil clearance for your performance engine. This specific set is 0.50mm undersize, which is critical if your crankshaft has been machined to match.

ACL has been making engine bearings for a long time, and their Race Series is a popular choice for those pushing their engines beyond stock. They use a tri-metal material construction that balances strength and conformability, helping to protect your crankshaft journals under load. Because these are an undersize bearing, they are intended for use when the crankshaft journals have been reconditioned or machined down by 0.50mm. It's important to verify your crankshaft dimensions before ordering to ensure a proper fit and function.

When installing these bearings, it's crucial to follow the manufacturer's recommended installation procedures and torque specifications. Proper oil clearance is key to the longevity of both the bearings and the crankshaft. If you're unsure about the process or need to have your crankshaft measured and machined, it's always best to consult with a qualified mechanic.