
Mastering The S55 Engine: The Essential Guide To Crank Hub Capture Kits And Upgraded Crank Hubs
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BMW’s S55 engine, powering models like the M3, M4, and M2 Competition, is a marvel of modern engineering, delivering exceptional performance right off the showroom floor. However, like all high-performance engines, it has its Achilles’ heel – the crank hub. The S55 engine’s crank hub is a known weak point, with potential for failure under high stress. To address this, many enthusiasts and experts turn to two key upgrades: the crank hub capture kits and upgraded crank hubs. This comprehensive guide explores the significance of these upgrades, delving into their functionalities, benefits, and essential considerations.
Understanding the Crank Hub Issue
The crank hub on BMW’s S55 engine connects the engine’s crankshaft to the timing chain, integral to maintaining precise engine timing. In stock form, this hub uses friction to keep the timing gears in sync. However, under high performance demands like increased boost or aggressive driving, the stock hub may slip, disrupting engine timing and leading to catastrophic failure.
The Solution: Upgraded Crank Hubs and Capture Kits
Upgraded Crank Hubs
Designed to combat the limitations of the stock setup, upgraded crank hubs incorporate additional keyways or pins to securely lock the hub to the crankshaft. This robust design is crafted from superior materials, enhancing durability and reliability, and is essential for those looking to push their engines harder and safer.
Crank Hub Capture Kits
A crank hub capture kit complements the upgraded hub by adding a physical restraint to keep the hub from moving. This kit typically includes additional locking mechanisms that clamp around the hub, ensuring alignment and timing integrity even if internal hub components fail.
Benefits of Crank Hub Upgrades
• Reliability: These upgrades significantly improve reliability, crucial for vehicles used in racing or high-performance settings.
• Performance Security: Secure engine components allow for more aggressive tuning and modifications, helping safely extract more power from the S55 engine.
• Peace of Mind: Knowing that your engine’s timing components are secure lets you enjoy driving without the fear of potential engine failure.
When Is a Crank Hub Capture Kit Enough?
For those running stock turbos, whether tuned or not, a crank hub capture kit alone might suffice. These kits provide a secure enhancement to the existing hub, making them ideal for less extreme modifications.
Suitability for Stock and Tuned Vehicles
• Cost-Effective: For drivers who wish to boost reliability without extensive mods, a capture kit is an economical choice.
• Enhanced Security: Even for tuned vehicles maintaining stock turbochargers, a capture kit provides a significant reliability boost by reinforcing the crank hub’s position.
• Simpler Installation: Installing a capture kit is generally less labor-intensive than full crank hub replacement.
Installation and Considerations
Installing these upgrades is complex and should ideally be handled by professionals. It involves disassembling parts of the engine, which might void warranties and requires expert knowledge.
Conclusion
Upgrading the crank hub and adding a capture kit are wise investments for BMW S55 engine owners, especially those who push their vehicles to the limits. These enhancements not only boost the engine’s reliability and performance but also provide the confidence to fully enjoy the capabilities of BMW’s powerful S55 engine. By addressing the crank hub issue with these strategic upgrades, you can significantly extend the life and performance of your S55-powered BMW, making it ready for whatever challenges you might throw its way.