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

This means the bearings are slightly larger than the standard size. They are intended for use when the engine's crankshaft journals have been machined down by 0.25mm to ensure a precise fit and proper oil clearance.

Are these bearings suitable for a stock engine rebuild?

These are performance rod bearings and are .25mm oversized. They are best suited for engines where the crankshaft has been machined to accommodate this size. For a stock rebuild without machining, you would typically need standard-sized bearings.

What is the primary benefit of using performance rod bearings like these?

Performance rod bearings are often made with improved materials and tighter tolerances. For these ACL bearings, the oversized nature is key to maintaining correct oil clearance and pressure, especially in engines that are driven hard or have been modified.

Questions? Call Us:631-982-0042

M-F 8AM-4PM ET

Trusted Since 1957

Est. 1957

ACL BMW N54B30/N55B30 3.0L .25mm Oversized Performance Rod Bearing Set

Specifications

Brand: ACL
Part #: 6B1584H-.25
UPC: 9315726447246

ACL BMW N54B30/N55B30 3.0L .25mm Oversized Performance Rod Bearing Set

Name: ACL BMW N54B30/N55B30 3.0L .25mm Oversized Performance Rod Bearing Set
Brand: ACL
Price: 186.27 USD
Availability: InStock

$186.27

Only 4 left in stock

ACL BMW N54B30/N55B30 3.0L .25mm Oversized Performance Rod Bearing Set. Get reliable engine performance with these well-built bearings.

Key Features

Fits select BMW 1 Series M, 135i, 335i, 335is, 535i, 740i/Li, X6, and Z4 models.
Designed for BMW N54B30 and N55B30 3.0L engines.
Bearings are .25mm oversized for use with machined crankshaft journals.
Manufactured by ACL, a well-known name in engine bearings.
Helps maintain proper oil clearance and pressure in performance applications.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

When you're pushing your BMW's N54 or N55 3.0L engine hard, especially if you've already made some upgrades, the stock rod bearings can become a weak point. These performance rod bearings from ACL are a solid option for rebuilding or upgrading your engine. They're manufactured to tight tolerances and are .25mm oversized, which is crucial for ensuring proper clearance and oil film when the crankshaft journals have been machined to match. This helps maintain oil pressure and protect your engine under demanding conditions.

This set is designed for specific BMW models including the 1 Series M, 135i, 335i (and its xDrive and xi variants), 335is, 535i (and its xDrive and xi variants), 740i/Li, X6, and Z4. If you're working on one of these engines and need reliable bearings for a performance build or a refresh, these ACL bearings are a well-built choice.