MMX Crank hub & capture plate | S55 | N55
Issues relating to the OE three-piece crank hub found in the S55 and N55 engine are unfortunately widely known. Thankfully, these issues are addressed with the MMR Performance one-piece billet crank hub.
Additionally, pairing the single piece crank hub with the optional MMR capture plate ensures complete peace of mind. A capture plate removes the possibility for the crank bolt to loosen with the engine’s vibrations or harmonics.
Our one-piece design ensures the friction plates can no longer slip.
The OE crank hub unit’s friction material is well known to slip, causing the timing to alter enough that piston-to-valve contact can occur and, if not totally standard and within the warranty period, leaves owners with a very expensive repair bill.
We have developed this single-piece Crank Hub together with our optional capture plate to ensure owners have complete peace of mind, whether on an untuned factory car or equally for those that wish to increase the power and torque output without ever having to worry again. MMX Performance have engineered the most comprehensive solution on the market and at one of the most compelling price points.
Our crank hub is machined from billet EN36 steel that’s been heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. The one-piece design ensures the friction plates can no longer slip and with a new crank bolt (supplied with the crank hub) tightened appropriately, this alone delivers the transformational improvement in reliability versus the OE version.
Single-piece design.
Machined from heat-treated billet EN36 steel.
Available to purchase with MMX capture plate.
Complete kit with everything you need.
Alternatvily, we also offer a four-pinned single-piece crank hub. For Stage 1 tuned S55 & N55 engines, this unpinned MMR Single-Piece crank hub is more than sufficient. Installation is more straightforward as the end of the crankshaft does not need to be precision drilled to mount the four locating dowels. However, for high power/torque engines tuned beyond this level, we recommend the upgraded pinned version of the crank hub that incorporates the 4-pin dowel drive mounting for the ultimate engine security. The 4-pin version is part number MMR20-1004.
Alongside our crank hub, fitment of the optional MMX capture plate ensures that owners have complete peace of mind, and makes sense to fit at the same time.
The capture plate removes the possibility for the crank bolt to be able to loosen with the engine’s vibrations or harmonics. The capture plate is an additional billet aluminium hat that securely bolts over the entire head of the crank bolt, making it literally impossible for the bolt to come undone. The capture plate part number is MMR20-1002.
BMW S55 and N55 bolt torque: 100Nm initial torque plus 270 degrees.
Vehicle fitment.
While every effort has been made to ensure the accuracy of vehicle information, we are not liable for abnormalities or inaccurate data. Customers are wholly responsible for checking fitment for their specific vehicle and engine variant.
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