11-06-2019, 10:24 AM | #45 |
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Yeah it's a lot LOL! Pretty much in there just in case I have more questions about the hub.
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11-06-2019, 12:11 PM | #46 | |
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What’s your view on cryogenically treating metals? |
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11-06-2019, 08:29 PM | #48 | |
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Solid upgrade in material choice. Good to know. Apples to oranges. The splines are machined on both ends of transmission shafts, not sharpened splines friction pressed in against a smooth bore. It very well may get the job done effectively, but it isn't the same system you are describing. |
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11-06-2019, 09:11 PM | #49 |
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11-07-2019, 06:15 AM | #50 | |
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The material is placed in a controlled environment and is taken down to extreme temperatures and the brought back to ambient temperatures slowly. Due to this treatment metals have increased in strength up to 60 % in some cases I’ve read. My mate had his brake rotors done and they lasted twice as long as they normally would . He also gets his gearbox internals and crankshafts done with this method.... he owns several race cars. He does this in addition to any heat treated metals as it alters the molecular structure and further increases strength apparently. |
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11-07-2019, 08:11 AM | #51 |
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lol, not secret, just in South Florida
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11-07-2019, 10:36 AM | #52 |
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Idk why but I thought this was hilarious LMAO
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11-08-2019, 03:07 PM | #53 | |
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11-08-2019, 07:24 PM | #55 |
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11-08-2019, 07:37 PM | #56 | |
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“ Splines are ridges or teeth[1][2][3] on a drive shaft that mesh with grooves in a mating piece and transfer torque to it, maintaining the angular correspondence between them. For instance, a gear mounted on a shaft might use a male spline on the shaft that matches the female spline on the gear. ” How is the VTT solution mated to the crank shaft? Does the male VTT crank hub being pressed inside the shaft cause it to make a female receiving splines. I hope that makes sense. If so, does that Somehow weaken the input shaft? If not, then This solution with the CBC really does sound like it would take care of the issue. |
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11-08-2019, 07:57 PM | #57 |
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I actually found the answer to my question. Looks like it does and looks beefy!
https://f80.bimmerpost.com/forums/sh...9&postcount=30 |
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11-08-2019, 08:25 PM | #58 |
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The VTT hub will dig channels into the crankshaft. All of the solutions either require you to modify the crankshaft, or modify it themselves when installed. The problem with this is, if the solution you chose is proven to fail and you want to remove/replace it with something better, you may now have to replace the crankshaft as well. I would honestly feel much better about the VTT solution if there were mated splines machined into the crankshaft. The possibility of failure would essentially be eliminated, as the amount of torque on the hub would have to be quite high to defeat the mated splines.
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11-09-2019, 12:41 AM | #59 | |
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11-09-2019, 07:06 AM | #60 |
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The material isn't being removed, it is being displaced. A lot, perhaps even most of it, piles up at the end of the hub. The splines are created to facilitate this, rather than being made to maximize grip. By machining mated splines you could easily double the staying power and put less stress on the crankshaft.
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11-09-2019, 07:17 AM | #61 | |
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Plus too few spelling errors |
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11-13-2019, 05:27 AM | #62 |
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Depends on what you are trying to accomplish. I haven't worked any with cryo treating as I've never found the right application for projects I've worked on. My current understanding is that it basically cold works the steel at a micro structure level by thermally shrinking the steel during the treatment. The resulting grain micro structure is permanently imparted into the steel. I haven't used it as I've found that there is always a better material out there that can be selected to use that does not need cryo treated.
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11-17-2019, 03:22 PM | #63 | |
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Those dowels just looked too flimsy for my liking, itsva shame they couldn’t be thicker/ bigger |
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11-18-2019, 06:14 AM | #64 | ||
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I'm in South FL too! Who are you having to do the hub install, and whereabouts? |
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11-20-2019, 05:00 PM | #65 |
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Had the hub installed just a few days ago. So far so good! Took the car out after it was done and had some with it without having to worry about the hub. Great investment!
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11-20-2019, 05:02 PM | #66 |
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DM me!
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