MMR Performance S55 Solid Crankshaft Hub Upgrade Kit + Crank Bolt Capture Plate (CBC) – BMW M3 M4 M2 Competition (F80 F82 F83 F87 F8X) – Crank Hub Fix, Timing Hub Solution – No-Drill, Single-Piece

Protect your S55 once and for all with the MMR Performance solid hub upgrade and bolt retainer plate. This precision machined solution tackles the well known timing gear slip on BMW’s twin turbo S55 by replacing the factory multi piece arrangement with a far stronger single piece assembly, dramatically reducing the risk of timing movement and costly engine damage.

Built for peace of mind on both standard and tuned S55 engines, this upgrade is the go to reliability mod for anyone who values engine safety, whether your car is a daily, weekend toy or track build. We run this hardware on our own S55 cars and our customers consistently report rock solid results and renewed confidence at any power level.

Why enthusiasts choose this S55 hub upgrade

• Single piece design prevents timing drive movement associated with the factory multi part hub and friction discs.
• Billet EN36 steel, heat treated with approximately 0.75 mm case hardening for exceptional strength, wear resistance and long term durability.
• Optional billet aluminium bolt retainer plate positively secures the crank fastener head to guard against loosening under high load.
• No drilling or pinning of the crankshaft required. The design avoids permanent modification, simplifying installation and saving workshop time.
• Engine safety first minimises the chance of timing shift, chain jump and valve to piston contact that can lead to catastrophic failure.
• Ideal for remapped S55s handling increased torque from software and hardware upgrades as well as spirited and track use.

Engineering highlights

• Precision machined solid crankshaft hub for the S55 platform.
• Case hardened EN36 billet construction for outstanding toughness and stability.
• Bolt retainer plate option adds a physical lock to the head of the crank fastener for ultimate security.
• Designed to be workshop friendly with straightforward fitment compared to alternative approaches.

What it solves

• Addresses the common S55 timing hub slip issue that can alter cam timing and risk engine damage.
• Provides a long term reliability upgrade for BMW S55 powered models where the factory friction based interface can move under load.

Options

• Solid hub only for a major reliability uplift over the factory configuration.
• Solid hub with bolt retainer plate for the most belt and braces solution.

Our experience

We have fitted this upgrade numerous times and run it ourselves. Feedback from MJ Modifications customers is consistently positive, praising the robust build quality, crisp machining and the peace of mind it delivers on both stock and tuned cars.

Fitting and support

Professional installation is strongly recommended. Book your installation with MJ Modifications in Warwickshire. Request a fitting quote via info@mjmodifications.co.uk.

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