What does it mean that these bearings are undersized by 0.25mm?

An undersize bearing, like these at 0.25mm, is used when the crankshaft journals have been machined down by the same amount. This ensures the correct oil clearance and a proper fit for the engine rebuild.

Are these bearings suitable for a stock engine rebuild?

While these are Race Series bearings built for higher stress, they can be used in a stock rebuild if the crankshaft journals are within the specified tolerance and the 0.25mm undersize is appropriate for your build. For a standard rebuild, ensure your crankshaft has been machined to accept these bearings.

What is the typical lifespan of these bearings?

The lifespan of engine bearings depends heavily on proper installation, oil quality and maintenance, and the specific operating conditions of the engine. ACL bearings are well-built, but performance applications can put significant stress on components.

Specifications

Brand: ACL
Part #: 5M8174H-.25
UPC: 9315726455722

ACL Ford 2.0L/2.3L DOHC Duratec Race Series Main Bearing Set

Name: ACL Ford 2.0L/2.3L DOHC Duratec Race Series Main Bearing Set
Brand: ACL
SKU: acl-acl-ford-2-0l-2-3l-dohc-duratec-race-series-main-bearing-set-t14-504944
Price: 127.74 USD
Availability: BackOrder

$127.74

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Fits 2003 Ford Focus. ACL Race Series Main Bearing Set, undersize 0.25mm, for 2.0L/2.3L DOHC Duratec engines.

Key Features

Fits 2003 Ford Focus.
ACL Race Series Main Bearing Set for 2.0L/2.3L DOHC Duratec engines.
Bearings are undersized by 0.25mm for use with a machined crankshaft.
Features a specialized overlay and hardened steel back for durability.
Designed to handle increased stress from performance engine builds.

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About this part

Product Details

When you're rebuilding a Ford Focus 2.0L or 2.3L DOHC Duratec engine, especially for performance applications, the main bearings are critical. This ACL Race Series Main Bearing Set is built to handle the stresses of higher RPMs and increased power output that stock bearings might not withstand. They are manufactured with a specialized overlay and a hardened steel back, giving them the durability needed for demanding use.

These bearings are undersized by 0.25mm, which is important to note for your engine build. This undersize is designed to be used with a crankshaft that has also been machined down by 0.25mm. This ensures a precise fit and proper oil clearance, which is essential for engine longevity and performance. ACL has a solid reputation for making well-built engine components, and this set is no exception.

When installing these bearings, always follow the manufacturer's recommended torque specifications and ensure your crankshaft journals are clean and within the specified tolerance. Proper installation is key to getting the most out of these high-performance bearings.