What does the 0.5 size designation mean for these bearings?

The '0.5' in the part number indicates that these bearings are 0.5mm undersize. This means they are designed to be used with a crankshaft that has been machined down by 0.5mm to ensure a proper fit and clearance.

What is the construction of these main bearings?

These bearings feature a bimetal construction. This typically means they have a steel backing for strength and an aluminum alloy overlay, which helps with heat dissipation and provides a good bearing surface.

Are these bearings suitable for a performance engine build?

Yes, King Engine Bearings are well-regarded in both performance and racing circles. Their bimetal construction is designed to handle the increased stresses and heat loads found in rebuilt or performance-oriented engines.

Specifications

Brand: King Engine Bearings
Part #: MB798AM0.5
UPC: 611500183812

King Engine Bearings BMW M20B20-23-25-27 / M50B25 / M52B20-25-28 (Size 0.5) Main Bearing Set

Name: King Engine Bearings BMW M20B20-23-25-27 / M50B25 / M52B20-25-28 (Size 0.5) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-m20b20-23-25-27-m50b25-m52b20-25-2-t14-495102
Price: 107.03 USD
Availability: BackOrder

$107.03

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King Engine Bearings main bearing set for BMW M20, M50, and M52 engines. Size 0.5. Direct fit.

Key Features

Fits BMW M20B20-23-25-27, M50B25, and M52B20-25-28 engines.
This set is 0.5mm undersize, intended for use with a machined crankshaft.
Features a bimetal construction with an aluminum base for improved heat transfer.
Includes the main bearings needed for a bottom-end rebuild.

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About this part

Product Details

When you're rebuilding the bottom end of your BMW, a solid set of main bearings is crucial. This main bearing set from King Engine Bearings includes the necessary bearings to replace the main bearings in your M20, M50, or M52 engine. These bearings are made with a bimetal construction, meaning they have an aluminum base, which helps with heat dissipation and overall longevity.

This particular set is sized 0.5mm undersize, which is important to note if you're machining your crankshaft. King Engine Bearings is a well-known name in the performance and racing world, and their bearings are built to handle the demands of a rebuilt engine. They fit a wide range of BMW models, including popular ones like the E30 325i, E36 328i, and E39 525i, among many others.