{"product_id":"034motorsport-1-piece-pinned-unpinned-crank-hub-w-crank-bolt-capture-plate-4pin-bmw-n55-s55","title":"034Motorsport 1-Piece, Pinned \u0026 Unpinned Crank Hub w\/ Crank Bolt Capture Plate (4Pin) - BMW N55 \u0026 S55","description":"\u003cp\u003e\u003cspan\u003eA Permanent Fix for the Factory Crank Hub Problem\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe factory crank hub used in BMW’s N55 and S55 engines is a well-known weak point, particularly as power levels increase. The OEM design uses three individual sprocketed pieces that drive the timing chains off the crankshaft. Importantly, none of these sprockets are mechanically linked together nor to the crankshaft . They rely only on friction washers and the clamping force of the crank bolt to stay aligned.\u003cbr\u003e\u003cbr\u003eUnder higher horsepower, rapid throttle transitions, hard launches, or even completely stock operation, the friction surfaces can slip. When this happens, the timing components rotate out of alignment, causing the engine to fall out of mechanical timing. This can quickly lead to bent valves, piston-to-valve contact, or catastrophic engine failure.\u003c\/p\u003e\n\u003ch3\u003eA True Mechanical Solution Instead of More Friction:\u003c\/h3\u003e\n\u003cp\u003eThe 034Motorsport 1-Piece Pinned Crank Hub replaces the entire multi-piece factory stack with a single CNC-machined billet EN36 steel unit. By combining all timing sprockets into one rigid body, every driven timing component remains physically linked, eliminating the possibility of internal hub slip.\u003cbr\u003e\u003cbr\u003eYou can configure the hub in the way that best suits your build:\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUnpinned Installation\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe 034 design can be installed in an unpinned configuration using the factory crankshaft with no drilling required. This setup works seamlessly with the included Crank Bolt Capture Plate, which locks the crank bolt in position and prevents any chance of bolt movement.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePinned Installation (Recommended for Heavy Abuse\/High Power)\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eFor those who want maximum mechanical security, the hub can also be installed in a 4-pin configuration, physically interlocking it with the crankshaft. One of the key advantages of the 034Motorsport Crank Hub is that it eliminates the need for a separate hub version. You can choose pinned or unpinned using the same part.\u003cbr\u003e\u003cbr\u003eTo ensure safe and accurate drilling, the kit includes a carbide drill bit and a dedicated drill guide and alignment jig. Most competing kits only provide a high-strength steel drill bit, which wears quickly when cutting into the crankshaft.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCrank Bolt Capture Plate: The Second Layer of Defense\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eMachined from 6061-T6 billet aluminum and anodized for long-lasting protection, the Capture Plate surrounds and locks the OE crank bolt in place, preventing any possibility of bolt walk-out. Paired with the 1-Piece Hub, this configuration eliminates both crank bolt and crank hub slip, protecting against the most common N55\/S55 timing failures.\u003cbr\u003e\u003cbr\u003eElongated mounting slots allow the Capture Plate to be used with both OE and 034Motorsport crank hubs, ensuring a precise and secure installation.\u003c\/p\u003e\n\u003ch3\u003eBuilt to Protect Your Engine, No Matter the Power Level:\u003c\/h3\u003e\n\u003cp\u003eFrom aggressively tuned street builds to fully track-prepped cars, the 034Motorsport 1-Piece Pinned Crank Hub and Capture Plate system is engineered to be the definitive solution for securing the crank hub. With uncompromising materials, precision engineering, and a complete installation package, this upgrade delivers the reliability and confidence your BMW deserves.\u003cbr\u003e\u003cbr\u003eUpgrade once. Protect forever.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1-Piece Crank Hub Features:\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1-Piece CNC-Machined Hub, Installable In 4-Pin Or Unpinned Configuration\u003c\/li\u003e\n\u003cli\u003ePrevents Crank Hub Slip And Failure On High-Power Engines\u003c\/li\u003e\n\u003cli\u003eBillet EN36 Steel, Heat-Treated With 0.75 Mm Case Hardening\u003c\/li\u003e\n\u003cli\u003eHigh-Strength Design Built For Extreme Power And Abuse\u003c\/li\u003e\n\u003cli\u003eOptional Precision Dowels Mechanically Lock Hub To Crank (Crank Drilling Required)\u003c\/li\u003e\n\u003cli\u003eComplete Installation Kit: Jig, Guide, Locating Bolt, And Carbide Drill Bit\u003c\/li\u003e\n\u003cli\u003eIncludes New OE Crank Bolt\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eCrank Bolt Capture Plate Features:\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMachined From 6061-T6 Billet Aluminum\u003c\/li\u003e\n\u003cli\u003eAnodized For Durability And Long-Lasting Finish\u003c\/li\u003e\n\u003cli\u003eSurrounds And Locks OE Crank Bolt, Preventing Loosening\u003c\/li\u003e\n\u003cli\u003eFits 034Motorsport Or OE Crank Hub With Elongated Slots For Secure Install\u003c\/li\u003e\n\u003cli\u003ePrevents 3-Piece Crank Hub Slip On S55 And N55 Engines\u003c\/li\u003e\n\u003cli\u003eInstalls With Engine In-Situ By Dropping Radiator For Access\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"034Motorsport","offers":[{"title":"Default Title","offer_id":57254957220222,"sku":"034-113-Z015","price":899.64,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0098\/0094\/1649\/files\/034motorsport-1-piece-pinned-crank-hub-w-crank-bolt-capture-plate-bmw-n55-and-s55-034-113-z015-1__92870.jpg?v=1776240648","url":"https:\/\/diversionstores.co.uk\/products\/034motorsport-1-piece-pinned-unpinned-crank-hub-w-crank-bolt-capture-plate-4pin-bmw-n55-s55","provider":"Diversion Automotive","version":"1.0","type":"link"}