ACL 6B1569HX-STD Race Series Rod Bearings +0.001" for 1996-2015 BMW S54 Inline-6

Vehicle Fitment

• 1996-2002 BMW Z3 M Coupe/Roadster (S54B32 3.2L DOHC - M Roadster)
• 2001-2006 BMW M3 (E46; S54B32 3.2L DOHC)
• 2003-2015 BMW Z4 M Coupe/Roadster (S54B32 3.2L DOHC)

Features

• ACL Race Series high-performance connecting rod bearings engineered for elevated RPM and load
• Extra +0.001" (~0.025 mm) oil clearance (HX) for improved oil film under race/street performance conditions
• Tri-metal F781 bearing material with hardened steel backing for superior strength and fatigue resistance
• High-strength overlay plate with reduced thickness enhances fatigue life
• Increased eccentricity aids hydrodynamic oil film formation at high RPM
• Elimination of flash plating improves heat transfer and bearing-to-housing grip
• 3/4-grooved design optimizes oil flow and bearing support area to reduce wear
• Tight wall tolerances ensure consistent clearances for performance engine builds
• Enlarged ID chamfers accommodate performance crank fillet radii

Specifications

• Part Number: 6B1569HX-STD
• Brand: ACL
• Series: Race Series Connecting Rod Bearing Set
• Size: Standard journal diameter (STD)
• Oil Clearance: Extra +0.001" (~0.025 mm) (HX)
• Material: Tri-metal alloy with hardened steel backing
• Compatible Engines: BMW S54B32 3.2 L DOHC inline-6
• Half Type: Identical halves
• Quantity: 12 bearing halves (6 pairs)
• Min Shaft Size: 1.9281" / 48.975 mm
• Max Shaft Size: 1.9288" / 48.991 mm
• Min Tunnel Size: 2.0866" / 53.000 mm
• Max Tunnel Size: 2.0872" / 53.015 mm
• Max Wall at Crown: ~0.0785" / 1.98 mm
• Max Overall Length: ~0.630" / 16.00 mm

Included Components

• 6x Pairs connecting rod bearings - standard size with +0.001" extra oil clearance

Product Description

The **ACL 6B1569HX-STD Race Series Rod Bearing Set** is a high-performance connecting rod bearing kit engineered specifically for the **BMW S54B32 3.2 L DOHC inline-6 engine** - the iconic powerplant in the **BMW M3 E46 (2001-2006)**, **BMW Z3 M (1996-2002)**, and **BMW Z4 M (2003-2015)**. Featuring ACL's Race Series metallurgy, including a tri-metal F781 alloy and hardened steel backing, these bearings are built to withstand the elevated RPM and load conditions seen in both spirited street driving and competition use.

This "HX-STD" set offers **extra +0.001" oil clearance**, helping promote a thicker hydrodynamic oil film under performance conditions while maintaining reliable fitment to the S54's stock crankshaft dimensions. The 3/4-grooved design ensures enhanced oil distribution, and the optimized bearing geometry - including increased eccentricity and enlarged ID chamfers - supports consistent lubrication and durability at high engine speeds. Whether you're refreshing your engine during a rebuild or seeking improved reliability for high-RPM use, these ACL Race Series rod bearings deliver superior performance, durability, and peace of mind for BMW S54 enthusiasts.