CBS55-6001 – Crank Hub Kit for F8X M2C, M2CS, M3, M3C, M3CS, M4, M4C, M4CS and M4GTS

CarBahn Crank Hub Kit replaces the Stock S55 Crank Hub, preventing the timing gear from slipping and causing damage to the engine.

The CarBahn Crank Hub Kit includes:

• • 1 – Keyed Crank Hub
  • 1 – Crank bolt
  • 4 – Drill Bits
  • 1 – Drill Bit Spacer
  • 1 – Drill Guide
  • 1 – Drill Guide Bolt

CarBahn has developed a Crank Hub Kit for the S55 Engine, designed to prevent the timing gear from slipping and spinning independently from the crank.

The Stock Crank Hub design allows the timing gear to spin independently from the crank causing the user to get the engine re-timed at a minimum and in worst case scenario cause piston to valve contact damaging the engine and requiring a complete engine overhaul.

The CarBahn Crank Hub Kit is unique in that it has a two locking pins similar to a crankshaft keyway. The CarBahn pins are not in sheer and do not suffer from oscillations associated with most crank pins. This design is currently being used by CarBahn High Performance Engines and previously by Dinan since 2010 in both street and race engine applications with no failures. Most aftermarket crank hubs have multiple pins that are in sheer. During major and minor harmonics associated with an internal combustion engine the crank hub will oscillate and cause excessive load on the pins in sheer. This can damage the pins resulting in failure over time. Steve Dinan has been building BMW race engines for over 40 years! This vast experience has led us to this design.

Crank Hub Kit uses modified BMW OEM sprockets keeping the metallurgical properties of the crank hub the same as the OEM BMW parts hence maintaining the durability same as the OEM part.