BMW N55/S55 Crank Bolt Capture Plate

WHAT IS A CRANK HUB BOLT CAPTURE?

The S55 suffers from a weak point in its crankshaft. It has been reported that when increasing the power to the engine, the crank hub can move or spin slightly under an extreme load. This is most apparent under high-rev downshifts or in the case of increased boost pressure which creates more stress on the engines rotating assembly. In order to keep this from happening, the crank bolt must be secured to the hub to keep it from backing off, but this can be a tricky solution since a simple dab of Loctite will not suffice. 

WHY DO I NEED IT?

Here is an easy, and cost-effective way to secure the situation; The S55 Crank Hub Bolt Capture. This lightweight and durable ring slips over the head of the crank bolt fully encapsulating it, and locks it to the crank hub and eliminating its ability to spin. The CHBC plate is 100% Billet Aircraft Grade Aluminum. What's more is that it is lightweight, meaning you aren't adding excess mass to the crankshaft which will avoid any imbalance or vibration issues.

While this is not a full fix for all crank hub spinning issues, engineers have found most issues have stemmed from the bolt itself backing out, and this is a great way to keep that from happening. Extremely lightweight meaning it adds virtually no weight to the crank which is important for balance and vibration.