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

This means the bearings are slightly smaller than standard size, by 0.50 millimeters. They are intended for use when the engine's crankshaft journals have been machined down to this specific undersize to true them up or account for wear.

Are these bearings suitable for a stock engine rebuild?

These are ACL's Race Series bearings, which are built with performance in mind. While they can be used in a rebuild, they are best suited for engines that are being modified or pushed harder than stock, especially if the crankshaft has been machined.

What is the benefit of the Race Series design?

The Race Series bearings feature a specialized overlay and a hardened steel back. This construction is intended to provide improved durability and performance under higher stress conditions compared to standard bearings.

Specifications

Brand: ACL
Part #: 8B1580H-.50

ACL BMW S65 V8 Engine (E90 M3) Race Series Engine Connecting Rod Bearing Set

Name: ACL BMW S65 V8 Engine (E90 M3) Race Series Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-bmw-s65-v8-engine-e90-m3-race-series-engine-connecting-rod-bearing-set-t14-631410
Price: 239.83 USD
Availability: BackOrder

$239.83

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

ACL BMW M3 Race Series connecting rod bearings. Undersize 0.50mm, these bearings are built for high-performance S65 V8 engines.

Key Features

Fits 2008-2013 BMW M3.
Race Series connecting rod bearing set for S65 V8 engines.
Undersize 0.50mm, designed for machined crankshafts.
Features a specialized overlay and hardened steel back for improved durability.
Direct fit replacement for the specified BMW M3 models.

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About this part

Product Details

You get a full set of Race Series connecting rod bearings in this kit, which means one box handles the critical job of replacing these vital engine components. These are specifically made for the S65 V8 engine found in the 2008-2013 BMW M3, a high-revving powerhouse that demands robust internal parts.

ACL's Race Series bearings are well-built with a focus on performance. They feature a specialized overlay and a hardened steel back for strength, which is important when you're pushing the engine hard. This set is undersized by 0.50mm, meaning they're intended for crankshafts that have been machined down to match this specification. Using the correct undersize bearing is crucial for maintaining proper oil clearance and ensuring the longevity of your engine, especially in demanding applications.

When you're rebuilding or upgrading the S65 V8, using bearings designed for performance is a smart move. Make sure your crankshaft has been measured and machined to accept a 0.50mm undersize bearing before installation.