BMW M3 F80 Crank Hub 4 Pinned Single Piece Upgrade S55 N55 MMR M2 M4 M135i

MMR PERFORMANCE CRANK HUB 4-PINNED SINGLE PIECE UPGRADE FOR BMW S55 | N55

Engine failures caused by the standard three-piece crank hub on the S55 & N55 engine are (unfortunately) well known, but these are fully addressed with the installation of the MMR Performance 4-Pinned Single-Piece billet Crank Hub

MMR Performance now offers this uprated version of our popular Single-Piece Crank Hub, with a 4-Pin dowelled location that locks onto the end of the crankshaft.

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.

This 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 & torque engines.

The centrepiece of the MMR kit is the UK made CNC-machined one-piece crank hub, created from billet EN36 steel that's been heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. Along with this comes 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 4-Pin location ensures that there is now no way that the friction plates can ever slip. With the new OE crank bolt tightened appropriately, this delivers a transformational improvement in reliability versus the OE version.

As MMR Performance offers two versions of the Single-Piece Crank Hub, which is best for you, pinned or unpinned? For most standard to Stage 1 tuned S55 & N55 engines, the unpinned MMR Single-Piece Crank Hub (MMR20-1003) 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 this upgraded pinned version of the Crank Hub that incorporates the 4-pin dowel drive mounting for the ultimate engine security.

Features:

• The MMR Crank Hub features a four-pinned design, enhancing the stability and strength of the crankshaft connection. This design minimizes the risk of slippage or misalignment, ensuring optimal performance under high-stress conditions.

• Crafted from high-quality materials, this crank hub is built to withstand the rigors of high horsepower engines. The durable construction ensures longevity and reliability, making it a must-have for enthusiasts and professional racers alike.

• To facilitate a seamless installation process, each MMR Crank Hub comes with a precision-engineered drill bit and drill guide. These tools are specifically designed to assist in the modification process, making it easier for enthusiasts to adapt their engines to the heightened demands of high-performance applications.

• The MMR 4 Pinned Crank Hub is engineered to meet or exceed original equipment (OE) standards, ensuring compatibility with your S55 engine. This compatibility preserves the integrity of your engine while unlocking its full potential.

• BMW M2 F87 2015-2018
• BMW M2 Competition F87 2018-2021
• BMW M3 F80 - 2014-2019
• BMW M4 F82 - 2014-2020
• BMW M135i F2x 2011 - 2019
• BMW M235i F2x 2013 - 2020
• BMW 335i F3x 2011-2019
• BMW 435i F3x 2013-2020
  

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• Distributed By Haz Motorsport

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