RK Autowerks 4 Pin Crank Hub, BMW N55/S55

Over the course of the past 15 years, the N55/S55 family has encountered a persistent issue related to crank hubs, which has resulted in undesirable consequences such as crankshaft spinning, timing inconsistencies, and potential severe damage to the engine.

In response to this challenge, RK Autowerks has developed an outstanding solution called the 4 Pin Crank Hub. This innovative design surpasses the standard OEM quality through its meticulous CNC machining and precise engineering. By integrating four pins, it effectively eliminates the independent spinning of the valve timing and oil pump chains. Furthermore, it securely fastens the crank hub to the crank nose, ensuring the entire assembly remains steadfast and maintains precise alignment.

The brilliant minds at RK Auto, led by Raza and his skilled team, have devoted meticulous effort to engineer this remarkable solution. Notably, the 4 pin design ensures that the hub remains stable, even with heavily modified N55s/S55s. The product has undergone laser scanning to guarantee a perfect fitment, serving as a direct replacement for the stock component. Additionally, it is proudly designed and machined in-house in Texas, USA, utilizing CNC mills and crafted from heat-treated 4130 Chromoly for enhanced durability.

The comprehensive kit includes the following components:

• One-piece crank hub/timing gear
• Keyed oil pump gear
• Drill bit
• Drill guide