5150 AutoSport
BMW / Toyota B58 Gen2 Steel Crankshaft by 5150 AutoSport
BMW / Toyota B58 Gen2 Steel Crankshaft by 5150 AutoSport
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Replaces BMW part #11218678953
Sold as a part of our 3.2L 5150 B58 Stroker Kit
5150's bully-grade crankshafts are machined from 4340 aerospace grade billet steel on Mazak 5-Axis Integrex 300-IV machines, some of the most technologically advanced CNC equipment available. Every 5150 crank that leaves our machines is quality checked to ensure that it is within the strict .0001" exacting tolerances we demand.
All 5150 AutoSport Billet Stroker Crankshafts feature large radius journals that add rigidity for the high boost, high RPM, and of course high horsepower applications our customers demand. This is also where material selection becomes crucial; aerospace steel is the same material used to manufacture the landing equipment on aircraft, selected for its longevity and ability to perform under high impact, high stress applications.
To ensure the best possible oiling and lubrication, the journals of each 5150 AutoSport Stroker Crankshaft utilize gun-drilled, CNC-ground oil holes, shaped like 'tear drops', are polished to a mirror finish, ensuring that each connecting rod bearing is properly oiled for lasting engine life. To ensure the life of the crankshaft itself, every 5150 Stroker Crank will undergo several heat treatments, including:
Stress Relieving: the crankshaft is heated to a below-critical temperature range. This 'relieves' the metal of any residual stresses that may have occurred during forming, straightening, rolling, or during machining.
Nitriding: during a multi-step heat treatment process, nitrogen is diffused into the surface of the crankshaft, effectively hardening the surface.
Shot Peening: the crankshaft is subjected to a cold working process where the surface is struck by 'shot,' or tiny round particles to harden the surface of the metal.
Magnaflux Inspecting: also known as magnetic particle inspection, this is a non-destructive testing process where a magnetic field is used for detecting cracks and flaws in the surface and subsurface of the crankshaft and confirm that it is ready for the intense conditions of a high performance engine.
Finally, to ensure every 5150 crankshaft has high RPM potential, each counterweight is carefully engineered for minimized windage through the crankcase. This means reduced oil resistance, meaning your crank will spin easier and faster through the rev range and extending the rev range.
Does NOT come with bearings!
11-21-8-678-953
11 21 8 678 953
11.21.8.678.953
BMW B58 Gen 2 Applications:
3 Series
2019-Present G20/G21 M340i / M340i xDrive
4 Series
2020-Present G22/G23/G26 M440i / M440i xDrive
Z Series
2019-Present G29 Z4 M40i
5 Series
2020-Present G30/G31 LCI 540i / 540i xDrive
6 Series
2020-Present G32 LCI 640i GT / GT 640i xDrive
7 Series
2019-Present G11/G12 LCI 740i / 740i xDrive
X3 Series
2020-Present G01 X3 M40i
X4 Series
2020-Present G02 X4 M40i
X5 Series
2018-Present G05 X5 xDrive40i
X6 Series
2019-Present G06 X6 xDrive40i
X7 Series
2018-Present G07 X7 xDrive40i
ALPINA B58 Gen 2 Applications:
B3 Series
2020-Present G20/G21 B3
B4 Series
2022-Present G22 B4
B5 Series
2020-Present G30 B5
XB7 Series
2020-Present G07 XB7
Toyota B58 Gen 2 Applications:
A90 / A91 Supra
2020-Present GR Supra 3.0
2020-Present GR Supra 3.0 Premium
2021-Present GR Supra 3.0 A91 Edition
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SKU:5150-CS-B58-G2
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