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

The +0.25mm sizing indicates that these bearings are intended for a crankshaft that has been machined down by 0.25mm. This is a common practice during engine rebuilds to correct wear or damage on the crankshaft journals.

What is the tri-metal construction?

Tri-metal construction refers to a bearing made of three distinct layers. It typically includes a steel backing for structural integrity, a copper-lead alloy layer for strength and heat transfer, and a soft babbit overlay for reduced friction and conformity to the shaft.

Are these bearings suitable for a stock engine rebuild?

While these bearings are well-built and can be used in stock applications, their advanced material composition is particularly beneficial for engines that have been modified or are expected to operate under higher loads and temperatures than stock.

Specifications

Brand: King Engine Bearings
Part #: CR6640SM0.25
UPC: 611500625862

King Engine Bearings BMW M20/M60 (Size +0.25mm) Connecting Rod Bearing Set

Name: King Engine Bearings BMW M20/M60 (Size +0.25mm) Connecting Rod Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-m20-m60-size-0-25mm-connecting-rod-t14-770002
Price: 130.62 USD
Availability: BackOrder

$130.62

On Backorder

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King Engine Bearings connecting rod bearing set for BMW M20/M60 engines. Size +0.25mm.

Key Features

This set is sized +0.25mm for use with a machined crankshaft.
Features a tri-metal construction with a steel backing, copper-lead alloy, and babbit overlay.
Designed for BMW M20 and M60 engines.
Helps manage heat and reduce friction in the connecting rod assembly.
Built to handle increased loads and temperatures.

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About this part

Product Details

These King Engine Bearings are built with a unique tri-metal construction, featuring a steel backing for strength, a copper-lead alloy for heat dissipation, and a babbit overlay for reduced friction. This combination is crucial for handling the demands placed on connecting rod bearings, especially in performance or rebuilt engines. They are specifically sized at +0.25mm, meaning they are intended for crankshafts that have been machined down by that amount during an engine rebuild to ensure a proper fit and oil clearance.

The CR6640SM0.25 set is designed for BMW M20 and M60 engines. King's approach focuses on creating a bearing that can withstand higher loads and temperatures than stock, which is important for maintaining oil pressure and preventing premature wear. The babbit overlay is particularly effective at conforming to the crankshaft surface, providing a smooth running surface that minimizes friction and heat buildup. This attention to material science helps ensure the longevity of your engine's bottom end.