What does it mean that these bearings are 0.001" undersize?

This means the inside diameter of the bearings is slightly smaller than standard size by 0.001 inches. This is typically used when the engine's crankshaft journals have been machined down during a rebuild to ensure proper clearance and oil film thickness.

Are these bearings suitable for a daily driver M5?

While these are Race Series bearings, they are well-built and designed for the S85 V10 engine. They are a popular choice for performance applications and rebuilds where precise tolerances are important for engine health.

Do I need to purchase anything else with these bearings?

When replacing connecting rod bearings, it's standard practice to also replace the connecting rod bolts. Always refer to the manufacturer's service manual for the complete list of recommended parts and procedures for your specific engine rebuild.

Specifications

Brand: ACL
Part #: 10B1580H-.025

ACL BMW S85B50 5.0L V10 Engine (E60 M5) Race Series Engine Connecting Rod Bearing Set

Name: ACL BMW S85B50 5.0L V10 Engine (E60 M5) Race Series Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-bmw-s85b50-5-0l-v10-engine-e60-m5-race-series-engine-connecting-rod-bear-t14-631150
Price: 303.96 USD
Availability: BackOrder

$303.96

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Fits 2006-2010 BMW M5. ACL Race Series connecting rod bearing set, 0.001" undersize, for the S85 V10 engine.

Key Features

Fits 2006-2010 BMW M5 and 2006-2010 BMW M6.
ACL Race Series connecting rod bearing set.
Designed for the BMW S85B50 5.0L V10 engine.
Bearings are 0.025mm (0.001") undersize for machined crankshafts.
Well-built for durability and consistent oil clearance.

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About this part

Product Details

ACL has been making engine bearings for decades, and this Race Series connecting rod bearing set for your 2006-2010 BMW M5 is one of their staples. These bearings are specifically made for the high-performance S85B50 5.0L V10 engine found in the E60 M5. If you're rebuilding or refreshing your V10, getting the right bearings is crucial for engine longevity and performance.

This set is built with a focus on durability and consistent oil clearance, which is essential for handling the stresses of a high-revving V10. They are manufactured to be 0.025mm (or 0.001 inches) undersize, which is important if you're dealing with crankshaft journals that have been machined during an engine rebuild. This precise sizing ensures proper oil film thickness and reduces the risk of bearing failure under demanding conditions.

When you're working on an engine like the S85, using well-built components is key. These ACL bearings are a solid option for anyone looking to maintain or improve the health of their M5's V10.