Originally Posted by JayL
(Post 691823)
So what's the difference between what you're running and what someone like Savington is running? Are others with a similar setup having issues?
IMO one of the big reasons is the M6 hardware TiAL uses, vs. the standard M8 hardware that Garrett uses. I haven't heard of this issue from Garrett-housing users with our Inconel studs installed. |
Is there no room to drill oversized and tap? That shits easy since there's already a hole to center on.
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Originally Posted by Savington
(Post 691930)
I have the same problem. I had a local shop drill the bolts last week and spent nearly $100 doing so. I am still running on a damaged turbine wheel because I want to confirm that these bolts work before spending $450 on another CHRA (this will be my third).
IMO one of the big reasons is the M6 hardware TiAL uses, vs. the standard M8 hardware that Garrett uses. I haven't heard of this issue from Garrett-housing users with our Inconel studs installed. |
Don't know. The Inconel hardware appears to be holding up so I'm not going to mess with it anymore.
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I wonder if you can laser cut the wire holes
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I haven't read to the 6 pages yet but I'd consider drilling out the 8mm stuff and running 10mm inconel hardware. Perhaps cutdown trackspeed stuff? And the cranes I see so far seem to be designed to help with cracking of the manifold, not the removal of the CHRA from the turbine. But I guess stiffening the entire assembly will change the harmonics of the CHRA somewhat regardless. You can try a EFR turbo. I'll weld on a T2 or whatnot flange for ya for teh cost of the flange + shipping. |
Originally Posted by TurboTim
(Post 692404)
These are the old stainless bolts? I see writing on the head. Their inconel stuff has no writing as they are made from rod stock.
I haven't read to the 6 pages yet but I'd consider drilling out the 8mm stuff and running 10mm inconel hardware. Perhaps cutdown trackspeed stuff? And the cranes I see so far seem to be designed to help with cracking of the manifold, not the removal of the CHRA from the turbine. But I guess stiffening the entire assembly will change the harmonics of the CHRA somewhat regardless. You can try a EFR turbo. I'll weld on a T2 or whatnot flange for ya for teh cost of the flange + shipping. I appreciate that, but I'm not sure what I'm doing yet, most likely the most cost-effective option which is to deal with what I have. The issue right now is totally managable of course, just not picture perfect. |
Originally Posted by hustler
(Post 691864)
I think the vibration is stretching the bolts, how else could the safety-wire stay in place and the CHRA come loose? I'll take one of my current-gen tial inconel bolts to work and see if they can drill them. |
Originally Posted by TurboTim
(Post 692410)
Because you've safety wired stainless bolts, not inconel bolts? I have one set of older-gen drilled tial inconel CHRA bolts here...kept them when I noticed tial stopped predrilling them and if I ever build a track car I might need them. But I know I won't ever build a track car...
I'll take one of my current-gen tial inconel bolts to work and see if they can drill them. |
Originally Posted by hustler
(Post 692416)
Are they the short bolts that look like the ones in my picture, or do the have the larger "head"? If I can't get mine drilled by JohnWag's friend then I'd love to get you to help me out. You've helped me out so much with this car too, lol. If this stuff doesn't cost me too much I'm going to get my car balanced and aligned if I have any money left.
What diameter safety wire are you using? EDIT: Didn't you buy a drill fixture? |
what about bent tab retainers that bend over the flats of the bolt and around the side of the retainer plates?
or just a second thin retaining plate that has tabs to bend up over the sides of the bolts. It would be disposable but so what. |
Originally Posted by y8s
(Post 692443)
what about bent tab retainers that bend over the flats of the bolt and around the side of the retainer plates?
or just a second thin retaining plate that has tabs to bend up over the sides of the bolts. It would be disposable but so what. Or spend a bunch drilling for safety wire and time to thread it properly? |
I bought a safety-wire jig but can't seem to find a drill bit that cuts or doesn't slip in the chuck.
I use .032" inconel wire with a meticulous effort in safety-wiring to put lots of tension on the wires, usually 2-3 attempts per wiring. Do you think the new TiAL bolts are also bad? Why is it so hard to get a quality Inconel bolt to fit our needs? |
Originally Posted by hustler
(Post 692456)
I bought a safety-wire jig but can't seem to find a drill bit that cuts or doesn't slip in the chuck.
I use .032" inconel wire with a meticulous effort in safety-wiring to put lots of tension on the wires, usually 2-3 attempts per wiring. Do you think the new TiAL bolts are also bad? Why is it so hard to get a quality Inconel bolt to fit our needs? Odd, the machine work on their other parts tends to be very very nice. |
I'm not sure why you guys switched to inconel and the reasons why it 'works' better but ti bet its thermal expansion rates. from matweb:
http://www.matweb.com/search/DataShe...e6369bc&ckck=1 http://www.matweb.com/search/DataShe...3eaa74fe812895 inconel 600 CTE (coefficient of thermal expansion... ie rate of expansion per unit increase of temp) is 13.3 vs stainless 301 being 16.6.** So, Hustler I feel your doubt... i certainly wouldn't want to screw up another turbine wheel on a 'might' work (the material property in question is within ~50% of each other) ...I'd want safety wire as well. I'll add that proper torque will be important. You dont want to over stretch the bolts and make them weak, but under tightening them will allow vibration and that is way worse. the change in preload with the extreme temp changes makes the problem more challenging....all the more reason for safety wire. *** that is for generic ass stainless and inconel, materials that are fastener specific will likely have a lower CTE. Also, drunk engineers tend to ramble...YMMV. -Brad |
My setup? Sigh, afraid I don't have much to add on this subject. In the short time it was running it was never pushed in the way hustler or Savington's setups are. Now we are trying to get the first miata to run on Hydra 2.7. Plus the low oil pressure issue. Like with any project you reach a point where you despair whether or not it will ever run. I'm there.
I sent Tial an email asking whether it would be possible to tap the housing for larger bolts just for better clamping force and less chance of stretch but they have yet to get back to me. If not I will probably do drilled bolts and safety wire as well. |
Yeah typical nickel alloys have a lower CTE than stainless steels, closer to mild steel like the typical CHRA. But they have much higher yield strengths especially at temperature. At 200F inconel 718 has a yield strength of 204000psi, 304stainless is 31200psi. Yeah. The % difference gets greater as temps rise.
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Tial replied that they don't think there is enough room to tap the housing for larger bolts.
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About that phi-rho-Z EDS percentages for the Tial bolts. Percent by weight:
Cr: 19.86% Mo: 2.60% Fe: 18.10% Al: 1.59% C: 2.47% Ti: 1.09% Balance Ni: 52.38% Hardness: 29-30 Rc I have some pointers by one of the machinists here about drilling holes into this material, I may try it someday this week at home after I buy some drill bits. |
Originally Posted by BenR
(Post 691923)
Have you tried nordlocks?
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