ACL 6B1490HX-STD Race Series Rod Bearings +.001" for 1982-2006 BMW M20/M50/M52

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In Stock: 12

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Product Specification:

SKU:ACL6B1490HX-STD

MPN: 6B1490HX-STD

UPC: 9315726278321

Weight: 0.41 lb

Inventory: 12

Type: Bearings

Vehicle Fitment

1982-1988 BMW 528e, 325e (M20B20/B25)
1984-1987 BMW 325i, 325is (M20B25/B27)
1986-2000 BMW 323i/323is/325i/328i (M20/M50 series)
1993-2005 BMW 525i/530i (M50B25, M52B20/B25/B28)
2001-2006 BMW 330Ci/330i/325xi (M54B25/B22/B30)
2004-2005 BMW X3 2.5/3.0i, 2001-2006 BMW X5 3.0i (M54 engines)
1997-2002 BMW Z3/Z4 2.5/3.0 (M52/M54 variants)

Features

ACL Race Series connecting rod bearings engineered for enhanced performance and durability
Tri-metal construction with hardened steel backing for superior support and fatigue resistance
Extra +0.001" oil clearance (HX) for more robust lubrication film in high-RPM engines
High-strength overlay plate improves fatigue properties under load
Increased crush retention improves bearing seating in the housing
Elimination of flash plating enhances heat transfer and housing grip
Increased eccentricity aids hydrodynamic oil film formation at elevated RPM
Tight wall tolerances promote consistent oil clearances for performance use
Enlarged ID chamfers to accommodate performance crank fillet radii

Specifications

Part Number: 6B1490HX-STD
Brand: ACL
Series: Race Series Connecting Rod Bearing Set
Size: Standard journal diameter with extra +0.001" oil clearance
Material: Tri-metal bearing with hardened steel backing
Half Type: Identical halves
Min Shaft Size: ~1.7707" / 44.975 mm
Max Shaft Size: ~1.7713" / 44.991 mm
Min Tunnel Size: ~1.8898" / 48.000 mm
Max Tunnel Size: ~1.8904" / 48.016 mm
Max Wall at Crown: ~0.0583" / 1.481 mm
Max Overall Length: ~0.709" / 18.00 mm

Included Components

12x Connecting rod bearing halves - standard size with +0.001" clearance

Product Description

The **ACL 6B1490HX-STD Race Series Rod Bearing Set** is a high-performance connecting rod bearing kit designed for a range of BMW inline-4 engines - including the M20, M50, M52, and M54 families - covering model years **1982 through 2006** across 3 Series, 5 Series, X3, X5, Z3, and Z4 applications. These premium bearings feature advanced tri-metal construction with hardened steel backing, engineered to support elevated engine speeds and loads compared to standard OE bearings.

The "HX" designation signifies **extra +0.001" oil clearance** over standard sizing, which enhances the hydrodynamic lubrication film, especially important in performance or modified engines that operate at higher RPMs or temperatures. ACL's Race Series bearings also include increased crush retention for secure seating, elimination of flash plating for improved heat transfer, and tight wall tolerances for consistent clearances, making this set a strong choice for rebuilds, performance tuning, or motorsport-oriented engines.