MMR20-1004

MMR 4-pinned single piece crank hub for BMW N55 & S55

Engine failures caused by the standard three-piece crank hub on the S55 and N55 engine are (unfortunately) well known, but these are fully addressed with the installation of the MMR Performance 4-pinned single-piece crank hub. Together with the option of adding our Capture Plate for ultimate security.

Single-piece crank hub with a 4-pin dowelled location that locks onto the end of the crankshaft.

The centrepiece of the MMR kit is the UK made CNC-machined one-piece crank hub, created from billet EN36 steel that's heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. Included are four aerospace precision machined dowels that mechanically lock the hub to end of the crank itself, plus a brand new OE bolt.

Installation of these dowels is certainly not a DIY job. But, to make the job easier for the professionals, ensuring that the required crank modifications are made safely and accurately, the MMR kit also includes a full installation jig that includes a bolt-on drilling guide, a location bolt for this guide, plus an HSS rolled high-speed drill bit.

Together, the single-piece design combined with the four-pin location ensures that there is simply no way that the friction plates can ever slip. With the new OE crank bolt tightened appropriately, this delivers a transformational improvement in reliability and peace of mind versus the OE version.

MMR 4-pinned single piece crank hub for BMW N55 & S55
MMR 4-pinned single piece crank hub for BMW N55 & S55
MMR 4-pinned single piece crank hub for BMW N55 & S55
MMR 4-pinned single piece crank hub for BMW N55 & S55
MMR 4-pinned single piece crank hub for BMW N55 & S55
MMR 4-pinned single piece crank hub for BMW N55 & S55
SKU: MMR20-1004

MMR 4-pinned single piece crank hub for BMW N55 & S55

Sale price£682.49

Tax excluded. Shipping calculated at checkout

Engine failures caused by the standard three-piece crank hub on the S55 and N55 engine are (unfortunately) well known, but these are fully addressed with the installation of the MMR Performance 4-pinned single-piece crank hub. Together with the option of adding our Capture Plate for ultimate security.

The OE crank hub unit's friction plate are known to slip rotationally, causing the timing to alter enough that piston-to-valve contact can occur, leaving owners with a very expensive repair bill.

Our 4-pin version of our single-piece crank hub kit is simply the ultimate solution to preventing this problem before it happens on high horsepower engines.

Configuration: Without MMR capture plate
In stock
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Product fitment.

While every effort has been made to ensure the accuracy of this information, we are not liable for abnormalities or inaccurate data. Customers are wholly responsible for checking fitment for their vehicle.

Series

1-Series, 2-Series, 3-Series & 4-Series

Chassis code

F2x, F3x, F80, F82 & F87

Model year

2011 - 2021

Machined from heat-treated billet EN36 steel

Four aerospace precision machined dowels

Where to purchase

Over 100 dealers, globally.

Our network of expert MMX Performance dealers can supply our full range, together with product guidance and advice, plus often an experience fitting service.

If you haven't got a MMX Performance dealer close to you, don't worry! Remember you can buy direct from our MMX Performance webshop.

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About MMX

A decade worth of obsession.

MMX Performance products have been designed and developed in the UK with passion by enthusiasts, for enthusiasts. All of our products are created in the world's toughest development lab: motorsport. We push the limits and reach new heights on track; then refine our products to give you the performance you need when you want it on the road.

Our extensive range of BMW and MINI upgrades offer unrivalled quality, performance and reliability worldwide; furthermore, every product carrying the MMX logo is thoroughly durability tested both on the road and track, so you can have complete peace of mind that you're installing only the best quality products to unlock the true performance potential from your car.