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CHRA/turbine bolts relaxing.

Old 02-28-2011, 05:07 PM
  #261  
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Originally Posted by JasonC SBB View Post
Hustler,

Have you tried the slowly-rev-in-neutral test to look for obvious resonances?
I'll one up you, I've felt the vibration through the intake plenum on the dyno at at 6000 its clear that damage could be done.
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Old 03-01-2011, 12:37 AM
  #262  
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Intake, OK. What about at the turbo?
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Old 03-04-2011, 05:44 PM
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brb, installing these:
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Old 03-04-2011, 06:01 PM
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When are your next few events?
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Old 03-04-2011, 08:01 PM
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Originally Posted by hustler View Post
brb, installing these:
Why do they look purple? Have you run heat cycles thru them?
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Old 03-04-2011, 09:28 PM
  #266  
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he's probably wearing a lavender shirt
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Old 03-04-2011, 09:53 PM
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Originally Posted by y8s View Post
he's probably wearing a lavender shirt
It is my lavender shirt, bolts are not discolored. The EDM guy said he did the submersed so they wouldn't harden.


It's in the car and off to the track next weekend. I won't know if this is a permenent fix until let say 6+ days or the end of the season.
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Old 03-04-2011, 11:04 PM
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That looks like a real pain in the nut sack to get such a tight clean twist on the safety wire. Hopefully this solution works, in for results.
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Old 03-04-2011, 11:58 PM
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Originally Posted by baron340 View Post
That looks like a real pain in the nut sack to get such a tight clean twist on the safety wire. Hopefully this solution works, in for results.
I got them all the first time today, the whole deal, from start to finish, with booze, and cutting the fire sleeve took about 90-minutes. Getting the flanges lined up, without a 3rd arm took the longest. The safetywire stuff is pretty straightforward after you've done it 3 times or so.

I was surprised by how brittle the old Inco wire was when it came off. I could break it by just pulling with needle-nose pliars.
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Old 05-27-2011, 10:48 PM
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Any updates on how many track events the inco. bolts have held up to for you so far? How soon until they are a confirmed fix to the problem?
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Old 05-27-2011, 11:19 PM
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Originally Posted by wittyworks View Post
Any updates on how many track events the inco. bolts have held up to for you so far? How soon until they are a confirmed fix to the problem?
I've done 4 days on these Inco CHRA bolts and they are still tight, on the ones I can get to with a wrench, I make take the turbo out and check at home rather than run into an issue at the track. Two of those days are on a track that's only 4th-6th gears so I'm fairly convinced today. I have a 2-day coming up the 2nd weekend of June, then another TXMC the following weekend. After that, if everything holds together, I'll call it "fixed".
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Old 06-18-2011, 06:45 PM
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hustler/Tim-

The nimonic Tial bolts that were tried and failed and were not safety wired (#2 in the sequence of fail)... did they have the provision for safety wire? I'll give hustler enough credit to assume they were not drilled otherwise they would have been wired up, but the nimonic bolts I received from Tim last year are drilled. This pic shows what I have and as you can see, they are tall sons of bitches.
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Their tallness is causing me clearance issues with the banjo fittings for the water lines, and hitting the oil drain flange. See post #26 in my bulid thread if you need illustrations. https://www.miataturbo.net/build-threads-57/scottfws-build-thread-47965/

Do you think there's a basic problem with the nimonic alloy, or do you think they'd hold up if safety wired? I have regular SS as well as inconel wire. I can make these bolts fit, but that will require either A) grinding stuff or B) $50-60 in new water line fittings, and I don't want to do either of those and then wind up destroying a turbine if the nimonic alloy is the underlying problem.

Those newer inconel Tial bolts that you have are much flatter and I think would be a good option for solving my clearance issues as well as having CHRA not fall off.
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Old 06-18-2011, 10:33 PM
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The bolts you have are the same metal as the newer flatter versions. Some Nickel alloy. I can give you the alloy percentages, I wasn't able to match it up but most inconels don't have their alloy contents published as it's proprietary.

I see your clearance issues. That must be why they went with the shorter bolts. They also stopped drilling for safety wire. I think I remember yours being drilled by tial. I drill .062 holes when I do it.
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Old 06-19-2011, 03:02 PM
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Excuse my ignorance, but how much of an issue is this with non stainless housings? e.g. non baller cast pauper housings.
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Old 06-19-2011, 11:22 PM
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I've now run
MSR-C
TWS
TWS
Hallett
Hallett
HHR

and the inco bolts are still tight.
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Old 07-11-2011, 08:24 PM
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Originally Posted by hustler View Post
I've now run
MSR-C
TWS
TWS
Hallett
Hallett
HHR

and the inco bolts are still tight.
[/thred]
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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