WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.Choose Between The Following SKU's Above: MMR20-1004, MMR20-1004FK.
Prevent engine failures and improve the reliability of your BMW S55 or N55 engine with the MMX 4-PIN Single Piece Crank Hub. Engine failures caused by the stock three-piece crank hub are a well-known issue, but MMR Performance has engineered the ultimate solution. This single-piece crank hub, machined in the UK from high-strength EN36 billet steel and heat-treated with a 0.75mm case hardening, eliminates the risk of slippage or failure associated with the OEM hub design. For even greater security, pair it with the optional MMR Capture Plate.
The MMR crank hub kit includes four aerospace-grade, precision-machined dowels that mechanically lock the hub to the crankshaft, ensuring a rock-solid connection. A brand new OE crank bolt is also included. Installation of these dowels is a professional-level task, which is why the MMR kit comes with a comprehensive installation jig. The jig features a bolt-on drilling guide, location bolt, and a high-speed HSS drill bit, making the process safer and more accurate for experts.
This advanced single-piece design, coupled with the four-pin dowel system, guarantees that the crank hub friction plates will never slip, providing long-term reliability. With the OE crank bolt correctly tightened, this crank hub offers an essential upgrade over the factory version.
For complete peace of mind, the optional MMR Capture Plate (MMR20-1002) eliminates the risk of the crank bolt loosening due to engine vibrations or harmonics. The billet aluminum Capture Plate bolts securely over the crank bolt head, making it impossible for the bolt to back out.
Key Features & Benefits:
- Single-piece crank hub design for BMW S55 & N55 engines
- Four aerospace-grade precision-machined dowels for secure fitment
- Machined from heat-treated billet EN36 steel for unmatched strength and durability
- Includes a complete installation jig with drilling guide and high-speed drill bit
- Optional Capture Plate (MMR20-1002) available for ultimate crank bolt security
- The best solution to prevent crank hub failure and ensure engine reliability
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