What does the +0.25mm sizing mean for these bearings?

The +0.25mm sizing indicates that these bearings are intended for use when the crankshaft journals have been machined down by 0.25mm. This is typically done to clean up wear or minor damage on the original crankshaft surface.

What is the 'SI' designation in the part number?

The 'SI' in the part number usually refers to King Engine Bearings' specialized high-performance overlay material. This overlay is known for its enhanced durability and resistance to wear and fatigue, making it suitable for demanding engine applications.

Do these bearings come with assembly lube?

This set includes the main bearings themselves. It is recommended to use a high-quality engine assembly lubricant during installation, which is typically sold separately.

Specifications

Brand: King Engine Bearings
Part #: MB5220SI1.25
UPC: 611500623462

King Engine Bearings Subaru Ej20/Ej22/Ej25 (Incl. Turbo) (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Subaru Ej20/Ej22/Ej25 (Incl. Turbo) (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-subaru-ej20-ej22-ej25-incl-turbo-size--t14-770538
Price: 43.64 USD
Availability: BackOrder

$43.64

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King Engine Bearings Subaru EJ20/EJ22/EJ25 main bearing set. Size +0.25mm.

Key Features

Fits Subaru EJ20, EJ22, and EJ25 engines, including turbocharged models.
Main bearing set sized at +0.25mm for use with machined crankshaft journals.
Features King's durable SI overlay for improved wear and fatigue resistance.
Well-built to handle the demands of daily driving and performance applications.

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About this part

Product Details

If you're rebuilding the bottom end of your Subaru EJ20, EJ22, or EJ25 engine, whether it's naturally aspirated or turbocharged, a quality main bearing set is crucial. These King Engine Bearings are designed to handle the stresses of daily driving and performance use, ensuring your crankshaft spins smoothly and reliably within the engine block. They are a well-built replacement for worn-out original bearings.

This set is specifically sized at +0.25mm, meaning it's intended for use when the crankshaft journals have been machined down by 0.25mm to clean up wear or damage. King uses a specialized overlay material that's known for its durability and ability to withstand the high loads found in performance engines. The 'SI' designation in the part number typically refers to their high-performance overlay, which offers improved resistance to wear and fatigue compared to standard bearings.

When installing these bearings, make sure your crankshaft journals are properly prepped and that you use the correct assembly lube. It's always a good idea to refer to your Subaru service manual for the specific torque sequences and procedures for your engine model.