04-15-2019, 03:06 PM | #67 |
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can anyone explain to me how this CBC stops the bolt from unwinding?
not a trick question i am looking to purchase one but before i pulled the trigger something in my mind pinged and said no.
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04-15-2019, 05:53 PM | #68 | |
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The Crank Bolt Capture encapsulates the head of the crank bolt and is secured to the faceplate of the pulley/hub using the 8 aforementioned bolt locations. This prevents the crank bolt from rotating independent of the hub (ie. backing out) but does not prevent a failure of the friction disks or possible stretching of the crank bolt. That is why it is only a partial solution.
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04-15-2019, 06:03 PM | #69 | ||
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04-15-2019, 06:33 PM | #70 |
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@smee I think you need to look at the etk to see how it goes together as this should clear it up for you along with @rotzy description.
http://www.realoem.com/bmw/enUS/show...diagId=11_5597
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04-15-2019, 06:38 PM | #71 | |
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Remember, the bolt and hub normally spin as one clamped assembly. It's only when something fails (or the bolt backs out) that they shift (ie. momentarily spin independently), thus throwing off the timing.
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04-16-2019, 03:02 AM | #72 |
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many thanks. you 2 are a lot better at explaining than some others
so one more question does the hub get pressure fitted in to the hole in the end of the crank? i.e if you took the bolt out does the hub simple fall off or do you need a to whack it off or pull it off with an extractor?
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04-16-2019, 03:44 AM | #73 |
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I can only assume as have not performed this myself but based on what I have read and the TIS it is a snug fit not a pressure fit. The TIS says just pull it out by hand with two of the damper bolts reattached to get grip.
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04-16-2019, 09:56 AM | #74 | |||
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The Capture costs about $450 installed (part included)
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04-18-2019, 01:39 AM | #75 |
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But has there been a case on this forum atleast where the CBC was installed and something related to crank hub failed.
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04-18-2019, 02:48 AM | #76 |
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04-18-2019, 05:18 AM | #77 | |
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04-18-2019, 05:19 AM | #78 |
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04-18-2019, 06:36 AM | #79 |
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was early in the morning lol sorry
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04-18-2019, 12:32 PM | #80 | |
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There is at least one user who had 2 SCHs before installing the CBC and has been good since. There is also another user that posted not too long ago who was doing a preemptive crank hub upgrade. The shop found a deformed and broken friction disk during disassembly. His hub was a ticking time bomb that would not have been saved with a CBC.
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12-27-2019, 09:16 PM | #84 |
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Yes, and they can just put another engine sitting in the crate in the garage in after each race if they want. Or did they say they run the same engine forever and the entire season?
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12-27-2019, 09:32 PM | #85 |
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The problem with the spline setup IMHO is the spline is supposed to "tighten" and hold better if the crank and gears experience spin. If that is the case, then the timing will then be off as it tightens. There is micro slippage and movement. Thought that was their design explanation instead of a key?
Many engine builders will suggest keyed shaft setups. Better than what BMW did for whatever stupid reason. Engineers should be fired for that dumb idea. But still, that works sort of like a shear pin. It can shear and fail. Just ups the limit it takes to do it. Better idea when running ok mods and higher power. Some insurance there. But 4k for that and hours? Ouch. I think the inexpensive plate with reasonable boost stage 1 this is a good reasonable solution. If you are going to run Stage 2 and up and drag racing, launching with DCT, then you should reinforce with something better than the plate. But wow, again, the cost for something that shouldn't have been an issue to begin with is hard to swallow and understand. So either be prepared for the worse case and have $$$, or just move on to another car....sad. |
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12-28-2019, 01:21 AM | #86 |
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My car is going to have 200k miles mpe exhaust. Bm3 stage 1 tune. Only cbc. Ftw. Lol
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12-28-2019, 11:56 AM | #87 | |
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Quote:
https://f80.bimmerpost.com/forums/sh....php?t=1621073 Chris |
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12-28-2019, 12:13 PM | #88 |
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VTT said V1 wouldn't slip. And took people's money on the basis it was a crank hub fix. Plenty of V1s have now slipped. Why should anyone trust that V2 will be any different. Gintani or Max PSI all the way.
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