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

The +0.25mm designation indicates that these bearings are slightly larger than standard size. This is used when the crankshaft journals have been machined down by 0.25mm during an engine rebuild to ensure a proper fit and oil clearance.

Are these bearings suitable for a performance rebuild?

Yes, the XP series bearings are built to withstand the pressures and temperatures typical in performance applications. Their design focuses on durability and friction reduction, making them a solid choice for a high-revving engine rebuild.

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Specifications

Brand: King Engine Bearings
Part #: MB5803XP0.25
UPC: 611500605536

King Engine Bearings BMW S65B40A (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings BMW S65B40A (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-s65b40a-size-0-25mm-main-bearing-s-t14-770979
Price: 453.34 USD
Availability: BackOrder

$453.34

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King Engine Bearings S65B40A (Size +0.25mm) Main Bearing Set

Key Features

Fits BMW S65B40A engines.
Main bearing set is +0.25mm oversized.
XP series bearings feature a specialized overlay material for improved durability and reduced friction.
Designed to handle the demands of high-revving V8 engines.
Helps protect the crankshaft and ensure smooth engine operation.

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About this part

Product Details

King Engine Bearings is well-known for making solid engine components, and this main bearing set for the BMW S65B40A engine is no exception. If you're rebuilding the heart of your BMW, these bearings are designed to handle the demands of that high-revving V8.

This set is specifically sized at +0.25mm, which is crucial if your crankshaft journals have been machined to that size during a rebuild. The XP series bearings feature a specialized overlay material that offers improved durability and reduced friction compared to standard bearings, helping to protect your crankshaft and ensure smooth operation. They are built to withstand the pressures and temperatures found in performance applications, providing a reliable foundation for your engine.

When installing these bearings, always ensure your crankshaft journals are clean and within the specified machining tolerances. Using the correct assembly lube is also essential for proper break-in and long-term performance.