Evolve Pinned Crank Hub - BMW F87 M2 Competition | F80 M3 | F82 | F83 M4 (S55) | F87 M2 (N55)
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Evolve 2-Piece 4-Pinned Crank Hub – BMW S55 & N55
Protect your BMW S55 or N55 engine against crank hub slip with the Evolve 2-Piece 4-Pinned Crank Hub Fix, a preventative reliability upgrade designed to address a known weakness in the factory crank hub arrangement.
The original design can slip or spin, particularly on tuned cars, although failures can also occur on completely standard vehicles. In less severe cases this can result in the engine requiring retiming, while more serious failures can lead to piston-to-valve contact and significant engine damage.
Evolve’s solution replaces the vulnerable factory arrangement with a stronger two-piece crank hub featuring a four-pin interface to the original crankshaft, adding a mechanical layer of security against unwanted movement.
Why Choose the Evolve Pinned Crank Hub?
The Evolve crank hub fix is designed for owners who want additional protection against one of the more serious potential failure points associated with S55 and N55 engines.
Key benefits include:
- 4-pin mechanical locking system
- Two-piece construction
- EN36 heat-treated material
- Designed to prevent crank hub slip
- Suitable for tuned and standard engines
- Professional installation-focused design
- Supplied with drilling and alignment hardware
- Made in the UK
Key Features
- Evolve crank hub fix
- Suitable for BMW S55 engines
- Suitable for compatible BMW N55 engines
- Two-piece design
- Four-pin interface
- EN36 heat-treated construction
- Designed for high-stress applications
- Helps prevent crank hub rotation
- Drill bit included
- Drill bit alignment guide included
- Made in the UK
- Intended for professional installation
Addresses the Factory Crank Hub Weakness
The factory crank hub arrangement relies on friction between components to maintain timing alignment.
Under sufficient load, the hub can potentially move relative to the crankshaft.
This is commonly referred to as:
- Crank hub slip
- Crank hub spin
- Spun crank hub
The risk is most often discussed on higher-output tuned engines, but it is not exclusive to modified cars.
What Happens if the Crank Hub Slips?
If the crank hub moves, the relationship between the crankshaft and camshaft timing can be disturbed.
Possible consequences include:
- Engine timing faults
- Poor running
- Non-starting
- Engine requiring retiming
In more severe cases, incorrect timing can result in:
- Piston-to-valve contact
- Valve damage
- Cylinder-head damage
- Major engine repair or rebuild
Four-Pin Mechanical Interface
The Evolve solution adds four mechanical pins between the crank hub and the original crankshaft.
This creates an additional physical locking interface rather than relying solely on the original friction-based arrangement.
The four-pin design helps significantly reduce the possibility of the hub rotating independently of the crankshaft.
Two-Piece Construction
The crank hub uses a two-piece design.
This is intended to simplify installation compared with some alternative pinned or one-piece solutions while still providing the mechanical security of a four-pin interface.
EN36 Heat-Treated Material
Evolve manufactures the crank hub from EN36, a high-strength material commonly used in demanding automotive and aerospace applications.
EN36 is particularly suited to components exposed to:
- High loads
- Repeated stress
- Torsional forces
- Demanding operating conditions
The material is heat treated to provide the strength and durability required for the application.
Designed for Performance Engines
The S55 and N55 are highly tuneable engines, with many vehicles running significantly more torque than standard.
The Evolve pinned crank hub is therefore particularly relevant for:
- Stage 1 cars
- Stage 2 cars
- Hybrid turbo builds
- Big turbo setups
- Track cars
- High-torque applications
Suitable for Standard Cars
A crank hub upgrade is not exclusively for modified vehicles.
Owners of standard cars may also choose to install a pinned hub as preventative maintenance, particularly if they intend to keep the vehicle long term or use it hard.
Preventative Reliability Upgrade
Unlike an upgrade designed to increase power, the crank hub fix is focused on reducing risk.
For many owners, the appeal is simply knowing that one of the more serious potential weaknesses in the engine has been addressed mechanically.
Ideal for Track Cars
Track use places sustained load and heat into the drivetrain and engine.
For vehicles used regularly on circuit, a pinned crank hub can be a worthwhile reliability measure alongside:
- Improved cooling
- Regular oil servicing
- Uprated brakes
- Track-focused suspension
- Engine monitoring
Supplied with Installation Hardware
The kit includes the specialist components required to assist a trained installer.
Included are:
- Drill bit
- Drill bit alignment guide
These are provided to help ensure accurate preparation of the crankshaft for the four-pin interface.
Professional Installation Required
This is not a simple bolt-on modification.
Installation involves precision drilling and work around the engine timing system, so the kit should only be fitted by an experienced professional familiar with BMW S55/N55 crank hub procedures.
Incorrect installation could cause serious engine damage.
Ideal Time to Install
The crank hub fix is commonly considered when carrying out:
- Major engine work
- Timing-related repairs
- Performance builds
- Turbo upgrades
- Preventative maintenance
Combining the job with other labour-intensive work can sometimes reduce duplicated workshop time.
Made in the UK
The Evolve crank hub fix is manufactured in the UK, using high-strength materials and a design developed specifically for BMW performance applications.
Suitable Engines
Designed for:
- BMW S55
- Compatible BMW N55 applications
Always confirm exact engine and vehicle compatibility before ordering.
Common S55 Applications
Typical S55-powered vehicles include:
- BMW F80 M3
- BMW F82 M4
- BMW F83 M4 Convertible
- BMW F87 M2 Competition
N55 Applications
The kit is also suitable for compatible BMW N55 engines.
Because N55 crank hub configurations can vary by application, exact fitment should be confirmed before ordering.
What's Included?
The Evolve 2-Piece 4-Pinned Crank Hub kit includes:
- 1x Evolve 2-Piece 4-Pinned Crank Hub
- 1x Drill bit
- 1x Drill bit alignment guide
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