01-24-2021, 05:56 PM | #45 | |
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Dang that analogy hurt to read. That said, CBC doesn't increase clamping force, it simply stops the bolt from vibrating loose. If the friction capability of the design (bolt torque intact) is insufficient for the load, the CBC will not stop a spin. This is why we say the CBC does a great job in reducing the risk, but the complete solution is a spline lock and the CBC working together in beautiful, sweet harmony. |
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01-24-2021, 11:26 PM | #46 | |
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Sounds like you generally agree on some points; however, I disagree fully with your statement that it stops it from working loose. What you are referring to with capture plates being used all over on industrial machines is true, but the implementation is entirely different and the substrate the capture is mounted to is fixed and doesn't rely on a friction disc. All torque still runs through the friction disc(s). |
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01-25-2021, 08:31 AM | #47 |
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Remember, 2 mechanisms.
1) Bolt vibes loose, reducing clamping force, reducing holding capacity = spin 2) Outright overcoming friction capacity of design = spin If, through various shock loads, the bolt torque is reduced, the holding capacity of the design is correspondingly reduced and you get to #2 above, but through #1. CBC stops this mechanism. It simply stops the bolt from being able to turn relative to the assembly unless you have failure mode #2, in which case you still get a spin. Another way of looking at it is the CBC allows the OEM design to work to its' maximum potential. The CBC + splinelock extends this to much higher levels. Hence why the complete solution is CBC + spline lock blah blah blah. |
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06-01-2021, 10:08 PM | #48 | |
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About how many hours is reasonable to install this from a performance shop?
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Chris, looking to have a shop in Ferndale, MI install a VTT CBC, what is a reasonable amount of shop hours for this? I’ve seen everything from 2-4...haven’t gotten the quote yet but they quoted me ~$800 to install downpipes so I’m anticipating a lot more hours than what the general consensus is...thanks!!! |
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06-04-2021, 01:48 PM | #50 | |
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03-02-2022, 02:55 PM | #51 | |
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06-26-2023, 02:11 PM | #52 |
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I know this thread has been dead a while, though I thought I might just chime in. I come from the n54 world and have recently bought a low mileage f80 (still have my e90 335i). Its been pretty well documented on N54's that the CBC doesn't work that well, a ton of guys with the VTT cbc have seen it fail, not sure about the other ones out there. Not sure I'd trust it on the s55 either but YMMV.
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06-26-2023, 02:49 PM | #53 | |
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06-26-2023, 10:21 PM | #56 |
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I enjoyed the lazy suzan analogy! My analogy is a bolt and washer. In the analogy the bolt is the crank bolt, the washer is the crank hub, and what the bolt is screwed into is the crankshaft. I think putting a CBC on your crank hub to stop the crank bolt from loosening is kind of like if you welded the bolt head to the washer in the analogy to stop the bolt from loosening. The bolt is rotationally locked to the washer via the weld, but the whole works can still unscrew together. Same with the crankhub and crankbolt - they can be rotationally fixed to eachother via the CBC, but the whole works can still unscrew from the crankshaft together as one big assembly.
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06-26-2023, 10:39 PM | #58 | |
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07-29-2023, 01:32 AM | #61 |
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so there are reports that the vtt cbc is breaking down. but the thing is people arent using an endoscope camera to look inside there crank hub to see if their bolts are broke down also. its probably not noticeable. the camera is like 20 bucks on ebay btw.
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