What does the +0.50mm sizing mean for these bearings?

The +0.50mm sizing indicates that these bearings are intended for use when the engine's crankshaft journals have been machined down by 0.020 inches (0.50mm). This is a common practice during engine rebuilding to ensure proper oil clearance with worn or reconditioned crankshafts.

What is the benefit of the lead-free composite material?

The lead-free composite material is environmentally safe and is ideal for medium-load engines. It provides a durable bearing surface that helps maintain proper oil film and reduce friction.

Are these bearings suitable for high-performance or racing applications?

These bearings are described as ideal for medium-load engines. For high-performance or racing applications with significantly higher loads and RPMs, it's always best to consult the manufacturer's specific recommendations for those conditions.

Specifications

Brand: King Engine Bearings
Part #: MB5784SI0.5
UPC: 611500591310

King Engine Bearings BMW N20B20 Main Bearing Set - Size +0.50mm

Name: King Engine Bearings BMW N20B20 Main Bearing Set - Size +0.50mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-n20b20-main-bearing-set-size-0-50m-t14-348448
Price: 172.68 USD
Availability: InStock

$172.68

Only 9 left in stock

King Engine Bearings BMW N20B20 Main Bearing Set - Size +0.50mm. A well-built bearing set for many BMW N20B20 engines.

Key Features

Fits many BMW models including 228i, 320i, 328i, 428i, 528i, X1, X3, X4, and Z4.
Main bearing set is sized +0.50mm for use with machined crankshafts.
Constructed from bi-metal aluminum material.
Features a lead-free composite that is environmentally safe.
Ideal for medium-load engines.

⚠️ 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 a BMW N20B20 engine, you need main bearings that can handle the load and keep things running smoothly. This main bearing set from King Engine Bearings is designed for that purpose. King has been specializing in engine bearings since 1960, focusing on supplying well-built components for a wide range of vehicles.

This particular set is sized at +0.50mm, meaning it's intended for crankshafts that have been machined down by that amount. The bearings are constructed from a bi-metal aluminum material, which is a lead-free composite ideal for medium-load engines like those found in many BMW applications. This material choice helps ensure durability and consistent performance during engine operation.

This set fits a variety of BMW models, including the 228i, 320i, 328i, 428i, 528i, X1, X3, X4, and Z4. When rebuilding an engine, using bearings that are precisely sized and made from appropriate materials is crucial for longevity and proper oil clearance.