5150 AutoSport Upgraded Crank Hub, BMW N55

The BMW N55 Engine's Crank Hub is a critical component, linking the crankshaft, water pump, power steering pump, and alternator. OEM hub failure occurs as the crank hub separates from the crankshaft, spinning independently of the crankshaft. This failure is not only well-known among technicians and enthusiasts, but a catastrophic failure, causing severe engine damage. 

The Problem

OEM Failure is mainly due to the design of the crank hub assembly; the OEM crankshaft's splined end is press-fit into the crank hub. As the assembly ages and wears, the connection between the hub and crank weakens, leading to slippage or complete separation.

As the crank hub separates from the crank, the timing chain loses its synchronization with the crankshaft and camshaft, causing piston-to-valve contact and severe internal engine damage. 

The 5150 Solution

Improved Materials: Our Upgraded Crank Hub is machined from 4340 Billet Steel to ensure strength and endurance, then heat treated to ensure longevity. 

4-Pin Design: The 5150 Crank Hub uses a 4-pin attachment style, distributing load across (4) points rather than the OEM single point press-fit. 

Included Crank Bolt: To further reduce the risk of slipping, spinning, or failure, our Crank Hub Upgrade includes a genuine BMW Crank Bolt, providing additional attachment reinforcement. 

Precision Machining: Ensuring precise fitment and alignment, the 5150 Upgraded Crank Hub is engineered and manufactured to tighter tolerances than OEM hubs. This also functions to maintain optimal engine timing and performance.

Power-Ready: 5150 Upgraded Crank Hubs are designed and manufactured with high performance, high boost applications. While they can be used as simply as a preventative OEM-replacement, they are also ready for the high heat and high stresses of high horsepower performance engine builds and aggressive driving applications. 

BMW N55 Applications:

1 Series

2010-2013     E82/E88     135i
2012-2016     F20/F21     M135i

2 Series

2014-2016     F22/F23     M235i
2016-2018     F87     M2

3 Series

2010-2015     E90/E91/E92/E93     335i
2012-2015     F30/F31/F34     335i
2015-2016     F30/F31     340i

4 Series

2013-2016     F32/F33/F36     435i
2016     F32/F33/F36     440i

5 Series

2010-2016     F10/F11     535i
2010-2017     F07     535i GT

6 Series

2011-2018     F12/F13/F06     640i Gran Coupe

7 Series

2012-2015     F01/F02     740i / 740Li

X1 Series

2013-2015     E84     X1 xDrive35i

X3 Series

2011-2017     F25     X3 xDrive35i

X4 Series

2014-2017     F26     X4 xDrive35i
2016-2017     F26     X4 M40i

X5 Series

2011-2018     E70/F15     X5 xDrive35i

X6 Series

2011-2019     E71/F16     X6 xDrive35i

ALPINA N55 Applications:

B3 Series

2013-2018     F30/F31     B3 Bi-Turbo

B4 Series

2014-2019     F32/F33     B4 Bi-Turbo

B5 Series

2010-2016     F10     B5 Bi-Turbo

B6 Series

2011-2018     F12/F13/F06     B6 Bi-Turbo Gran Coupe