Description
The MMX Performance BMW S55 / N55 One-Piece Crank Hub Upgrade Kit is designed to resolve the well-known issues with the factory three-piece crank hub used in the S55 and N55 engines. These issues often lead to the friction material slipping, which can cause timing errors, potentially resulting in piston-to-valve contact and costly repairs. The MMX Performance one-piece billet crank hub provides a permanent solution, offering superior reliability and performance for both factory and tuned engines.
Manufactured from high-strength billet EN36 steel and heat-treated with a 0.75mm case hardening, this one-piece crank hub offers exceptional durability. The single-piece design eliminates the risk of friction plate slippage, while the new crank bolt, included with the kit, ensures secure attachment, greatly improving the overall reliability compared to the OE version.
For those looking for additional peace of mind, the optional MMR Capture Plate can be added to prevent the crank bolt from loosening under engine vibrations and harmonics, securing your engine’s critical components. Whether you’re running a stock engine or one with increased power and torque, the MMX Performance One-Piece Crank Hub Upgrade Kit is engineered to keep your engine running smoothly without the worry of costly failures.
Fitment:
- 2015-2020 BMW M3 (F80) with S55 engine
- 2015-2020 BMW M4 (F82/F83) with S55 engine
- 2016-2020 BMW 340i (F30/F31) with N55 engine
- 2016-2020 BMW 440i (F32/F33/F36) with N55 engine
- 2017-2020 BMW 540i (G30) with N55 engine
Key Features:
- One-piece billet crank hub for BMW S55 and N55 engines
- Machined from durable EN36 steel with 0.75mm case hardening for superior strength
- Eliminates friction plate slippage, preventing timing issues and costly repairs
- New crank bolt included for secure attachment, ensuring increased reliability
- Optional MMR Capture Plate to prevent crank bolt loosening from engine vibrations
- Ideal for both factory and high-performance tuned engines
- Comprehensive solution with a competitive price point
