MMX Performance BMW M2 M3 M4 335i 435i S55 N55 Crank Hub Capture Plate

The MMX Performance BMW S55 / N55 Crank Hub Capture Plate is the definitive insurance policy against one of the BMW tuning world's most well-documented engine failures: the OE three-piece crank hub on the S55 and N55 engines is widely known to be susceptible to crank-bolt loosening, and the consequences of even slight torque loss range from spun timing to catastrophic engine damage. The MMX capture plate prevents the failure mode entirely, mechanically, and is a must-fit for any tuned, hard-driven, or track-used N55 or S55 BMW.

The N55 and S55 crank bolt is susceptible to loosening due to the engine's natural vibrations and harmonics. With even the slightest loss of torque, the crank hub can slip, pulling the timing out of correct adjustment with potentially disastrous consequences. The MMX capture plate completely surrounds and physically captures the head of the OE crank bolt, making it mechanically impossible for the bolt to turn or back out. It is, in the most literal sense, a fail-safe.

The plate is machined from T-6061 billet aluminum and anodized in MMX's trademark gloss black finish. It secures to either the OE crank hub or to the MMX one-piece crank hub upgrade, with elongated mounting slots that ensure a perfect, secure installation every time regardless of which hub it's fitted to. Installation is also possible with the engine remaining in-situ, the only access requirement is dropping the radiator, no engine-out service required.

For standard cars and street-driven N55 / S55 BMWs, the capture plate alone is an excellent insurance against the crank-bolt failure mode. For modified, hard-driven, or track-used cars (and certainly for any car running increased boost or aggressive tunes) MMX recommends pairing the capture plate with the MMX one-piece crank hub for complete peace of mind. Both products are designed to work together as a system, and either can be ordered individually.

Product Details

• Crank hub capture plate for BMW S55 and N55 engines
• Machined from T-6061 billet aluminum, anodized gloss black
• Installs with the engine in-situ: only requires dropping the radiator for access
• Compatible with the MMX one-piece crank hub upgrade (sold separately)
• SKU: MMR20-1002

What's Included

• One (1) MMX billet aluminum capture plate
• Required mounting hardware

Notes

• For modified, hard-driven, or track-used cars, MMX strongly recommends pairing this capture plate with the MMX one-piece crank hub for complete peace of mind
• Includes a 1-year manufacturer warranty against defects in materials and workmanship
• Designed and tested in the United Kingdom