What does the '0.025mm undersize' mean for these bearings?

This means the bearings are manufactured to be 0.025 millimeters smaller in diameter than standard size. This is intended for use with a crankshaft that has been professionally machined down to match this specific undersize, allowing for tighter, more precise clearances.

Are these bearings suitable for a daily driver?

While these are RACE Series bearings built for performance, they can be used in a daily driver if the engine is properly rebuilt with the correct clearances and maintenance schedule. However, they are optimized for higher stress conditions.

What other parts are typically needed when replacing connecting rod bearings?

When replacing connecting rod bearings, it's common practice to also replace rod bolts, and to have the crankshaft measured and potentially machined. Always consult your vehicle's service manual or a qualified mechanic for a complete list of required components and procedures.

ACL RACE Series Connecting Rod Bearings for BMW N54/N55/S55B

Name: ACL BMW N54/N55/S55B30 3.0L Inline 6 RACE Series Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-bmw-n54-n55-s55b30-3-0l-inline-6-race-series-engine-connecting-rod-beari-t14-630904
Price: 208.61 USD
Availability: InStock

ACL BMW N54/N55/S55B30 3.0L Inline 6 RACE Series Engine Connecting Rod Bearing Set

$208.61

Only 1 left in stock

ACL RACE Series connecting rod bearing set for BMW N54/N55/S55B30 3.0L engines. These are 0.025mm undersize for a custom fit.

Key Features

Fits select BMW 1 Series M, 135i, 335i, 335is, 535i, 740i, X6, and Z4 models.
Designed for BMW N54, N55, and S55B30 3.0L Inline 6 engines.
RACE Series bearings are built for high-performance applications.
Features a 0.025mm undersize for custom crankshaft machining.
Utilizes advanced overlay technology for consistent performance.
High-strength steel backing provides a solid foundation.

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Will this fit your vehicle?

Product Details

ACL has been making engine bearings for decades, and this RACE Series connecting rod bearing set for your BMW N54, N55, or S55B30 3.0L engine is one of their staples. These bearings are crucial for keeping your engine running smoothly, especially if you're pushing the limits or have a high-performance build. They sit between the connecting rod and the crankshaft, handling the immense forces and friction generated during combustion.

What sets these RACE Series bearings apart is their construction and the fact that they are a 0.025mm undersize. This allows for a more precise fit and potentially tighter tolerances when paired with a crankshaft that has been machined to match. ACL uses advanced overlay technology and a high-strength steel backing to ensure durability and consistent performance under demanding conditions. This means they can handle the extra stress of performance driving or racing without premature wear.

If you're rebuilding your BMW's engine or performing a performance upgrade, these ACL bearings are a solid option. Make sure your crankshaft has been measured and machined to the correct undersize specification before installation. Always refer to the manufacturer's installation instructions for proper torque and assembly procedures.