VAC Billet vs OEM BMW N54/N55/S55 Crank Hub Concentricity

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The tolerances of our new N54/N55/S55 billet crank hubs are designed to exceed factory specification! Say goodbye to broken crank hubs that spin independently and cause catastrophic valvetrain damage. After hundreds of hours of research, development, and testing, these are just about ready.
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[@SloppiGoose]

There's not really much of a difference at 3 microns..... Also testing a brand new billet vs a used OE part isn't a very accurate test. You'd be amazed to know the runout of ANY of the gears in any zf trans.

[@urbanweekendwarrior7238]

kinda my thoughts- the oem one has clear wear and grime accumulation. best comparison would be between new oem and new aftermarket, but really this test would only show if there was a catastrophic mistake in machining as this is a sprocket so exact OD isn't quite as important as correct & even tooth spacing.

[@SloppiGoose]

@@urbanweekendwarrior7238 the only way to test this correctly would be to have a fixture for concentricity of the actual sprocket. And then check each one comparatively, you need to R&R this. So you would need 5 of each one just to be sure it isn't a defective piece. Not to mention this is spinning way too fast you only need about 50rpm. I buff collets at 1000rpm. And just to clear anything up. I set up CNC machines for a living. Lol.

[@strussdo]

Do you guys make pulleys that reduce vibration in the diesel engines?