What does the '+0.5' in the part number mean for these bearings?

The '+0.5' indicates that these bearings are 0.5mm undersize. This means they are designed to be used when the crankshaft journals have been machined down by 0.5mm as part of an engine rebuild. Proper sizing is critical for correct oil clearance.

What is the advantage of silicon bi-metal aluminum material?

This material is chosen for its balance of strength and conformability, making it well-suited for medium-load engines. It helps ensure proper oil film formation and durability between the connecting rod and crankshaft.

Are these bearings suitable for a high-performance build?

These bearings are described as ideal for medium-load engines. For high-performance or racing applications, it's always best to consult with King Engine Bearings or a performance engine builder to select the specific bearing series that matches your engine's demands.

Specifications

Brand: King Engine Bearings
Part #: CR4515SI0.5
UPC: 611500521041

King Engine Bearings Ford/Mazda 2.0L Duratec (Size+ 0.5) Silicon Bi-Metal Aluminum Rod Bearing Set

Name: King Engine Bearings Ford/Mazda 2.0L Duratec (Size+ 0.5) Silicon Bi-Metal Aluminum Rod Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-mazda-2-0l-duratec-size-0-5-silic-t14-306009
Price: 28.29 USD
Availability: BackOrder

$28.29

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Fits 2004-2013 Mazda 3. King Engine Bearings 2.0L Duratec rod bearing set. Silicon bi-metal aluminum construction for medium-load engines.

Key Features

Fits 2004-2013 Mazda 3, 2005-2011 Ford Focus, 2010-2013 Ford Transit Connect, and 2006-2008 Mazda MX-5 Miata.
Set includes connecting rod bearings for Ford/Mazda 2.0L Duratec engines.
Bearings are +0.5mm undersize, intended for use with machined crankshaft journals.
Constructed from silicon bi-metal aluminum material.
Lead-free composite is environmentally safe.
Ideal for medium-load engine applications.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the bottom end of your 2004-2013 Mazda 3 with the 2.0L Duratec engine, getting the right connecting rod bearings is crucial. These bearings sit between the connecting rod and the crankshaft, allowing the rod to spin smoothly while handling the forces from combustion. King Engine Bearings specializes in this exact component, and their CR4515SI0.5 set is built for this application.

These bearings are made from a silicon bi-metal aluminum material, which is a solid choice for medium-load engines like the Duratec. They are also lead-free, making them an environmentally safe composite. This set is specifically sized at +0.5mm, meaning they are intended for use when the crankshaft journals have been machined down by 0.5mm during an engine rebuild. It's important to match the bearing size to the crankshaft journal condition for proper oil clearance and engine longevity.