What does '.025mm oversized' mean for these bearings?

This means the inner diameter of the bearing is slightly larger than the standard size by 0.025mm. This is used when the crankshaft journals have been machined (ground) down to a standard undersize to remove wear or damage, ensuring the correct oil clearance is achieved.

What material are these ACL bearings made from?

These bearings utilize a tri-metal construction. This design typically involves a steel backing, a bronze-aluminum alloy intermediate layer, and a lead-tin-copper overlay, offering a good balance of strength and the ability to conform to the crankshaft.

Do these bearings come with installation instructions?

While these bearings are designed as a direct replacement, it is always recommended to refer to the manufacturer's official service manual or installation guide for the correct procedures, torque specifications, and oil clearance measurements for your specific BMW engine.

Specifications

Brand: ACL
Part #: 6B1490H-.025
UPC: 9315726278260

ACL BMW M20/M50/M52/M54 - 1919CC 80.0mm Bore 66.0mm Stroke .025mm Oversized Conrod Bearing Set

Name: ACL BMW M20/M50/M52/M54 - 1919CC 80.0mm Bore 66.0mm Stroke .025mm Oversized Conrod Bearing Set
Brand: ACL
SKU: acl-acl-bmw-m20-m50-m52-m54-1919cc-80-0mm-bore-66-0mm-stroke-025mm-oversized-con-t14-249677
Price: 114.51 USD
Availability: BackOrder

$114.51

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ACL BMW M20/M50/M52/M54 conrod bearings. .025mm oversized for a precise fit during engine rebuilds.

Key Features

Fits many BMW M20, M50, M52, and M54 engines.
Features an 80.0mm bore and 66.0mm stroke.
Bearings are .025mm oversized for machined crankshaft journals.
Constructed with a tri-metal material for durability and conformability.
Designed for engine rebuilds requiring precise bearing clearances.

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About this part

Product Details

When you're rebuilding the engine in your BMW, getting the connecting rod bearings right is crucial for longevity and performance. These ACL bearings are specifically made for the M20, M50, M52, and M54 engines, featuring an 80.0mm bore and 66.0mm stroke. They come .025mm oversized, which is important for ensuring a snug fit on the crankshaft journals after they've been machined to spec during an engine rebuild.

ACL uses a tri-metal material construction for these bearings, which is a popular choice for performance applications because it offers a good balance of strength and conformability. This means the bearing can adapt to minor imperfections in the crankshaft while still providing solid support. The .025mm oversize is a common size for crankshafts that have been ground and polished to remove wear or damage, ensuring a tight oil clearance when paired with the correct oil pressure.

This set includes all the connecting rod bearings you'll need for your engine. If you're in the middle of an engine overhaul and have had your crankshaft journals machined, these ACL bearings are a solid option to get your engine back together with reliable internal components.