What does '+0.25mm undersize' mean for these bearings?

This means the bearings are slightly smaller than standard size by 0.25mm. They are designed to be used on a crankshaft that has been machined down by 0.25mm to account for wear or to achieve specific oil clearances.

What is the advantage of tri-metal construction?

Tri-metal bearings have three layers of different materials. This construction is well-built to handle higher loads and temperatures, offering better durability and performance compared to simpler bearing designs.

Are these bearings suitable for a stock engine rebuild?

These bearings are a solid option for a performance rebuild or when addressing crankshaft wear. If your crankshaft is still at standard size, you would need a standard size bearing set, not this +0.25mm undersize set.

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Specifications

Brand: King Engine Bearings
Part #: CR6904SV0.25
UPC: 611500626890

King Engine Bearings Porsche 911 M97 (Size +0.25mm) Connecting Rod Bearing Set

Name: King Engine Bearings Porsche 911 M97 (Size +0.25mm) Connecting Rod Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-porsche-911-m97-size-0-25mm-connecting-t14-770139
Price: 139.61 USD
Availability: InStock

$139.61

Only 1 left in stock

Key Features

This is a +0.25mm undersize bearing set.
Features a tri-metal construction for durability and load capacity.
The SV series includes a specialized overlay for improved dirt resistance.
Designed for Porsche 911 M97 engines.

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About this part

Product Details

These King Engine Bearings CR6904SV0.25 connecting rod bearings are built with a tri-metal construction, meaning they have three distinct layers of material to handle the demanding conditions inside your Porsche 911 M97 engine. This design helps them withstand higher loads and temperatures compared to standard bearings, which is crucial for maintaining proper oil clearance and preventing premature wear, especially if you're rebuilding or refreshing the engine's bottom end.

The SV series bearings feature a specialized overlay that offers improved resistance to dirt and debris, a common concern in performance engines. Because these are a +0.25mm undersize set, they are intended for use on crankshafts that have been machined down by 0.25mm to correct for wear or to achieve specific clearances. Proper installation is key; ensure your crankshaft journals are clean and within the specified tolerance for this bearing size before installation.