What does the '0.025 inch undersize' mean?

This means the bearings are slightly smaller than standard size. They are intended for use when the crankshaft journals have been machined down (ground) by 0.025 inches during an engine rebuild. This ensures the correct oil clearance is maintained.

Are these bearings suitable for a daily driver?

While these are Race Series bearings, they can be used in a daily driver, especially if the engine has been rebuilt or modified. For a stock daily driver, standard size bearings might be more appropriate unless the crankshaft has been machined.

What is the most important step during installation?

Ensuring proper oil clearance is critical. Always follow the manufacturer's torque specifications and lubrication guidelines during installation to guarantee the longevity and performance of the bearings and the engine.

2004-2013 Mazda 3 Connecting Rod Bearings | ACL 4B4390H-.025

Name: ACL Ford Prod. 4 2.0L Duratec Race Series Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-ford-prod-4-2-0l-duratec-race-series-engine-connecting-rod-bearing-set-t14-630768
Price: 49.64 USD
Availability: BackOrder

ACL Ford Prod. 4 2.0L Duratec Race Series Engine Connecting Rod Bearing Set

$49.64

On Backorder

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

Fits 2004-2013 Mazda 3. ACL Race Series connecting rod bearings, 0.025 inch undersize, for your 2.0L Duratec engine.

Key Features

Fits 2004-2013 Mazda 3 and 2005-2006 Ford Focus.
ACL Race Series connecting rod bearing set.
Designed for 2.0L Duratec engines.
Set is 0.025 inch undersize for use with a ground crankshaft.
Well-built for performance applications.

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Product Details

Doing some engine work on your Mazda 3, maybe a rebuild or a performance upgrade? These ACL Race Series connecting rod bearings are a solid choice for your 2.0L Duratec engine. They're designed to handle the demands of a performance build, offering a well-built option for critical engine components.

These bearings are a 0.025 inch undersize set, which is important if you've had your crankshaft ground down during the rebuild process. ACL has been making engine bearings for a long time, and their Race Series is known for good material strength and precise tolerances. They help ensure proper oil clearance between the connecting rod and the crankshaft, which is key for engine longevity and performance, especially when you're pushing the engine harder.

When you're putting an engine back together, getting the bearing clearances right is crucial. Make sure to follow the manufacturer's recommended torque specifications and oiling procedures during installation to get the best results from these ACL bearings.