What does '.25mm Oversize' mean for these rod bearings?

This means the bearings are slightly larger than standard size. They are designed to be used when the engine's crankshaft journals have been machined down by 0.25mm to account for wear or to prepare for a rebuild. This ensures a precise fit and correct oil clearance.

What is the material of these ACL rod bearings?

These bearings are made from a tri-metal material. This type of construction is known for offering a good balance of strength, durability, and the ability to conform to the crankshaft for optimal oil film retention.

Do I need any special tools to install these rod bearings?

Installing rod bearings requires significant engine disassembly. You'll need standard engine rebuilding tools, including torque wrenches for precise tightening of rod caps, and potentially a dial bore gauge or Plastigage to verify bearing clearance. Always refer to the manufacturer's installation instructions.

ACL BMW S65 V8 .25mm Oversized Performance Rod Bearing Set

Specifications

Brand: ACL
Part #: 8B1580H-.25
UPC: 9315726443545

ACL BMW S65 V8 .25mm Oversized Performance Rod Bearing Set

Name: ACL BMW S65 V8 .25mm Oversized Performance Rod Bearing Set
Brand: ACL
Price: 214.13 USD
Availability: InStock

$214.13

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2008-2013 BMW M3. ACL .25mm oversize rod bearings for your S65 V8. A solid option for engine rebuilds.

Key Features

Fits 2008-2013 BMW M3.
ACL performance rod bearing set for the S65 V8 engine.
Bearings are .25mm oversize, intended for use with a crankshaft machined to the same undersize.
Constructed with a tri-metal material for strength and wear resistance.
Designed to maintain proper oil clearance and reduce friction.

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Fits this vehicle

BMW M3 2008-2013

Product Details

You get a full set of .25mm oversized rod bearings in this kit, which means you're ready to address worn bearings or prepare for a performance build on your S65 V8 engine. These bearings are crucial for proper oil flow and reducing friction between the crankshaft and connecting rods. When they wear out, you can experience knocking noises and serious engine damage, so replacing them during an engine overhaul is a smart move.

ACL has been making engine bearings for a long time, and these are well-built for performance applications. The .25mm oversize means they're designed to be used when the crankshaft journals have been machined down by .25mm to clean them up or account for wear. This ensures a precise fit and proper oil clearance, which is critical for engine longevity and performance, especially in a high-revving V8 like the S65. They're made with a tri-metal material that offers good strength and wear resistance.

When you're rebuilding an S65 engine, getting the bearing clearances right is key. These ACL bearings are a popular choice because they offer a reliable solution for both stock rebuilds and modified engines where oil pressure and flow are even more critical.