Crankshafts for BMW F83 M4 S55 3.0L

Clear BMW chassis

The engines crankshaft takes all of the explosive energy from the pistons and translates this to the drivetrain. When bearings spin due to improper maintenance or oil starvation, the shaft can become scored and is no longer serviceable. Turner carries Genuine BMW replacements that fit and perform exactly as intended

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Crankshaft Hardware (3)

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WPC-Treated Race Series Main Bearings - Complete Set - BMW N52 N54 N5...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:34147790

Part#: N5X-WPC-MB

In Stock

$ 607.99

This product was last offered at the strikethrough price on
05-03-2026

$ 487.99 USD

Limited Qty Sale

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Qty

$ 607.99

This product was last offered at the strikethrough price on
05-03-2026

$ 487.99 USD

Limited Qty Sale

Add to Wish List

Upgrade your engine build with Turner's WPC-treated Race Series Bearings, engineered for serious performance enthusiasts. Starting with ACL’s high-performance bearing shells, these Race Series bearings are built to withstand extreme RPMs and stress. Utilizing a "Duraglide" tri-metal construction and a high-strength overlay plate, these bearings offer superior oiling and heat resistance for high-RPM operation.

Our WPC-treated bearings take ACL’s already impressive design and enhance it even further. The WPC treatment process strengthens and smooths the bearing surface by firing high-speed, ultra-fine particles at the bearing shells, reducing friction and improving durability. This advanced surface treatment ensures smoother operation and improved heat dissipation, which are critical for any high-performance engine.

Key Features:

Duraglide Tri-Metal Construction: ACL's Race Series bearings feature a high-strength overlay for enhanced performance. Optimized Oiling: Designed to promote better oil flow during high-RPM conditions. Precise Fitment: Manufactured with OEM-level precision using micron tolerance machining. WPC-Treated for Strength: Surface treatment adds strength and reduces friction for improved engine performance. No Flash Plating: Allows for better heat transfer and bearing retention. Thermal Discharge Process: Smoother, stronger components through WPC’s unique thermal discharge technology. Enhanced Heat and Friction Resistance: Built to combat the biggest enemies of high-performance engines. Don’t settle for standard bearings—choose Turner Motorsport WPC-treated Race Series Bearings for the ultimate engine performance upgrade. Perfect for your next engine rebuild or main bearing service!

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MMX Performance - 4-Pin One-Piece Crank Hub Upgrade Kit - With MMR Ca...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:45039725

Part#: MMR20-1004FK

Ships in 2 Business Days

$ 1,227.99 USD

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$ 1,227.99 USD

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The centerpiece of this MMX kit is the UK-made CNC-machined one-piece crank hub, created from billet EN36 steel that's heat-treated with a 0.75mm case hardening, making it incredibly strong and durable. Included are four aerospace precision-machined dowels that mechanically lock the hub to the end of the crank itself, plus a brand new OE bolt. Installation of these dowels is certainly not a DIY job. But, to make the job easier for the professionals, ensuring that the required crank modifications are made safely and accurately, the MMX kit also includes a full installation jig that includes a bolt-on drilling guide, a location bolt for this guide, plus an HSS rolled high-speed drill bit. Together, the single-piece design combined with the four-pin location ensures that there is simply no way that the friction plates can ever slip. With the new OE crank bolt tightened appropriately, this delivers a transformational improvement in reliability and peace of mind versus the OE version. Also included is the MMR Crank Bolt Capture Plate. This adds one additional layer of defense, preventing the crank bolt from being able to back out and loosen over time, ensuring everything is tightly held together as intended.

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5150 AutoSport High Performance Main Bearing Set, BMW S55

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:23416567

Part#: 5150-HPMBS-S55

Ships in 3 Business Days

$ 549.99 USD

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$ 549.99 USD

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S55 / N55 One-Piece Crank Hub Upgrade Kit - 4-Pin

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:19891361

Part#: MMR20-1004

Special Order: No Guaranteed ETA

$ 1,064.99 USD

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$ 1,064.99 USD

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Both the N55 and S55 engines are plagued by the same issue when chasing high horsepower numbers... the dreaded crankhub failure. Fortunately MMR Performance has released an upgraded version of their already stout single-piece crankhub, but this time offering a 4-pin dowelled location that locks onto the front of the crankshaft. This configuration eliminates the multi-piece crankhub with friction discs in favor of a more robust single piece crankhub. Recommended for high-powered cars over 700 Horsepower

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