ACL Race Series BMW N54 N55 S55 Conrod Bearings – 6B1584H/STD
ACL Race Series conrod bearing set for compatible BMW N54, N55 and S55 3.0-litre engines.
Part Number: 6B1584H/STD
The ACL Race Series 6B1584H/STD bearing set is a performance replacement conrod bearing set for compatible BMW N54, N55 and S55 engines.
This listing is for the standard-size bearing set.
ACL Race Series Construction
ACL Race Series bearings use performance-focused bearing construction including:
- Tri-metal bearing construction
- High-strength steel backing
- Increased bearing crush and retention
- Performance-oriented bearing geometry
Correct crankshaft journal condition and bearing clearance should always be checked during installation.
What Is Included?
- Complete ACL Race Series 6B1584H/STD conrod bearing set
New connecting-rod bolts are not included with this standalone product.
BMW S55 Applications
Suitable S55 applications include:
- BMW F87 M2 Competition
- BMW F87 M2 CS
- BMW F80 M3
- BMW F80 M3 Competition
- BMW F80 M3 CS
- BMW F82/F83 M4
- BMW F82/F83 M4 Competition
- BMW F82 M4 CS
- BMW F82 M4 GTS
Engine: BMW S55B30
The same bearing part number is also used for compatible BMW N54B30 and N55B30 applications.
Why Do Rod Bearings Wear?
Connecting-rod bearings are highly loaded internal engine components.
During normal engine operation, the crankshaft journal is supported by a thin film of engine oil between the journal and bearing surface.
Bearing condition can be affected by factors including:
- Mileage and engine hours
- Oil condition
- Oil contamination
- Engine operating temperature
- High engine load
- High-RPM or track use
- Crankshaft journal condition
- Bearing clearance
- General long-term wear
S55 Installation at Swift Performance
For BMW S55 customers, Swift Performance also offers these ACL Race Series bearings as part of our crank-hub workshop package.
When carried out alongside our S55 crank hub installation, the ACL rod-bearing upgrade is: £500 including VAT
This includes:
- ACL Race Series 6B1584H/STD bearings
- New OEM BMW connecting-rod bolts
- Installation
Because our S55 crank-hub procedure already requires removal of the engine sump, carrying out the rod bearings at the same time avoids a significant amount of duplicated labour.