EPIC nuts/studs loosening thread (reposting stupid stuff without reading = warning)
#761
I understand this.
But many times in this thread it has been mentioned about them actually spinning out when the nut was held steady. Also, mine did not plastically deform. If >1800deg F for an extended period doesn't do it, then what additionally needs to be added to the equation to make it happen. I don't think its as cut and dry as you are making it out to be.
Didn't Vega mention installing a brace on his turbo and not having issues since. Maybe has has since and just didn't update the status of his studs.
I think a lot of it has to do with not just heat, but the fact that the side mount position puts so much stress on the top 2 bolts. My turbo is pretty well braced by by ewg/dp connection.
I know you had some monstrosity welded onto your old begi setup and it didn't float the boat for you. I think a engine to turbo brace is what is needed to support the entire vertical load. Then again, what do I know, I don't run sub spec miata times......
But many times in this thread it has been mentioned about them actually spinning out when the nut was held steady. Also, mine did not plastically deform. If >1800deg F for an extended period doesn't do it, then what additionally needs to be added to the equation to make it happen. I don't think its as cut and dry as you are making it out to be.
Didn't Vega mention installing a brace on his turbo and not having issues since. Maybe has has since and just didn't update the status of his studs.
I think a lot of it has to do with not just heat, but the fact that the side mount position puts so much stress on the top 2 bolts. My turbo is pretty well braced by by ewg/dp connection.
I know you had some monstrosity welded onto your old begi setup and it didn't float the boat for you. I think a engine to turbo brace is what is needed to support the entire vertical load. Then again, what do I know, I don't run sub spec miata times......
#762
I quess I can let The cat out of the bag here,I have my "welding"degree In Materials Technology.I wrote my senior Paper on Nickel alloys.The only last word answer is...
Inconel studs/bolts with Monel nuts.Inconel has 200,000 psi.tensile strength@1800*
Monel=180,000.Inconel is too abrasive to tap=broken tap or EDM'd threds.I love this thread(and the OtherOne).Its been fun.316/304L Stainless steel will fail past 1200* there tensile strength will is in 2000 lb range and the thermal expansion of the Parts is way greater than that.The Gold star goes to Sav.for the research on Mat.apps.
-G-
Inconel studs/bolts with Monel nuts.Inconel has 200,000 psi.tensile strength@1800*
Monel=180,000.Inconel is too abrasive to tap=broken tap or EDM'd threds.I love this thread(and the OtherOne).Its been fun.316/304L Stainless steel will fail past 1200* there tensile strength will is in 2000 lb range and the thermal expansion of the Parts is way greater than that.The Gold star goes to Sav.for the research on Mat.apps.
-G-
#763
To me the issue seems to be with cast manifolds. I'm not debating that people are having issues. I just think that a well made brace will work.
Greg - As has been shown by travis's fea modeling, the fasteners do not get to the same temp as the manifold and flange. So saying that the ss studs get to 1200deg I think is not fair. In fact, NO ONE has measured their temp at WOT to make any claim on temperature.
I know that my studs had no issues at all with heat enough to warp a 1/2" mild steel flange. They were still tight along with the nuts. Main differences being my manifold is made from mild steel weld els and my turbo is well braced by my ewg/dp connection.
Is there a consensus that this issue is only with the cast applications?
Greg - As has been shown by travis's fea modeling, the fasteners do not get to the same temp as the manifold and flange. So saying that the ss studs get to 1200deg I think is not fair. In fact, NO ONE has measured their temp at WOT to make any claim on temperature.
I know that my studs had no issues at all with heat enough to warp a 1/2" mild steel flange. They were still tight along with the nuts. Main differences being my manifold is made from mild steel weld els and my turbo is well braced by my ewg/dp connection.
Is there a consensus that this issue is only with the cast applications?
#764
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I think studs that are rated for the temperature and force, vs. mild steel crap, is the ticket.
#766
- I know they did not deform because they were still as tight as the day I installed the turbo.
- I can't comment on this.
- Then you agree that a brace is A possible solution? Not to say the better studs is not also a solution.
- No need to be a dick, I have read the thread. I've been keeping up with it the entire time. It has focused, narrowly, on fasteners for the most part. I think due attention has not been paid to a proper brace.
- Again, reaffirming that a brace did in fact help. You particular brace didn't "fix" your problem, but thats not to say that a different one would not have worked better.
- I agree that its a possible solution. I'm just trying not to limit this thread to a single solution. Why not have multiple things that can fix a problem. Put on both and you are bullet proof...
I get that you are trying to help the community fix an issue that you don't even face anymore. That's cool, but don't attack me and accuse me of not reading the thread. I'm not just some noob that just joined this forum. Sure I don't go to the track every weekend like you, but I guarantee that I know just as much as you about these cars. You are too quick to dismiss any solution that you did not come up with yourself.
- I can't comment on this.
- Then you agree that a brace is A possible solution? Not to say the better studs is not also a solution.
- No need to be a dick, I have read the thread. I've been keeping up with it the entire time. It has focused, narrowly, on fasteners for the most part. I think due attention has not been paid to a proper brace.
- Again, reaffirming that a brace did in fact help. You particular brace didn't "fix" your problem, but thats not to say that a different one would not have worked better.
- I agree that its a possible solution. I'm just trying not to limit this thread to a single solution. Why not have multiple things that can fix a problem. Put on both and you are bullet proof...
I get that you are trying to help the community fix an issue that you don't even face anymore. That's cool, but don't attack me and accuse me of not reading the thread. I'm not just some noob that just joined this forum. Sure I don't go to the track every weekend like you, but I guarantee that I know just as much as you about these cars. You are too quick to dismiss any solution that you did not come up with yourself.
#768
To me the issue seems to be with cast manifolds. I'm not debating that people are having issues. I just think that a well made brace will work.
Greg - As has been shown by travis's fea modeling, the fasteners do not get to the same temp as the manifold and flange. So saying that the ss studs get to 1200deg I think is not fair. In fact, NO ONE has measured their temp at WOT to make any claim on temperature.
I know that my studs had no issues at all with heat enough to warp a 1/2" mild steel flange. They were still tight along with the nuts. Main differences being my manifold is made from mild steel weld els and my turbo is well braced by my ewg/dp connection.
Is there a consensus that this issue is only with the cast applications?
Greg - As has been shown by travis's fea modeling, the fasteners do not get to the same temp as the manifold and flange. So saying that the ss studs get to 1200deg I think is not fair. In fact, NO ONE has measured their temp at WOT to make any claim on temperature.
I know that my studs had no issues at all with heat enough to warp a 1/2" mild steel flange. They were still tight along with the nuts. Main differences being my manifold is made from mild steel weld els and my turbo is well braced by my ewg/dp connection.
Is there a consensus that this issue is only with the cast applications?
With that being said,I will be using 3/8" 316L shoulder bolts,if they fail nothing to drill out just replace
-G-
#771
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I get that you are trying to help the community fix an issue that you don't even face anymore. That's cool, but don't attack me and accuse me of not reading the thread. I'm not just some noob that just joined this forum. Sure I don't go to the track every weekend like you, but I guarantee that I know just as much as you about these cars. You are too quick to dismiss any solution that you did not come up with yourself.
#774
My solution is just too expensive and the competing product would completely demolish any chance to redeem the money. The material was A286 1800/1325F* heat treat. Its far superior to any other fastener material in this application. You won't find it anywhere for less then a 100 dollars for 4 studs. More likely in excess of 40-50 dollars a stud.
That's really too bad. Obviously matching CTE's is big, and it'd be a good idea to drill studs and put in thermal logging devices... :-)
Anyway, the question: While it won't do me any good, how about bolts? Can those be had cheaply? They wouldn't even need to be metric. Or, if std thread studs are available cheaply, you might be able to do something there. If I'm already taping my mani for big studs, it's not that bad to tap them american. I hate the concept, but if it's how it is... It's how it is.
#777
I checked our material tracker, and we carry A286.
The last order that went out was for 3/4" x 4" all thread studs...they sold for $14/pc.
I tried to tell Travis he give us a call and see what Sales and Methods could scrounge up...but he didn't take the advice.
We also do the heat treating.
The last order that went out was for 3/4" x 4" all thread studs...they sold for $14/pc.
I tried to tell Travis he give us a call and see what Sales and Methods could scrounge up...but he didn't take the advice.
We also do the heat treating.
#778
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Stage-8, maybe?
Stage8 makes locking bolts, but the problem is that it will be difficult/impossible to fit them into the T25 flange on the turbo unless you went with really short bolts. Then, there might be the issue of insufficient thread engagement in the manifold...
That said, their hardware works as designed.
They are local to me so I will swing by later this week and see if they will allow me to borrow a few bolts to test fit on my car - stay tuned.
That said, their hardware works as designed.
They are local to me so I will swing by later this week and see if they will allow me to borrow a few bolts to test fit on my car - stay tuned.
#779
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Stage8 makes locking bolts, but the problem is that it will be difficult/impossible to fit them into the T25 flange on the turbo unless you went with really short bolts. Then, there might be the issue of insufficient thread engagement in the manifold...
That said, their hardware works as designed.
They are local to me so I will swing by later this week and see if they will allow me to borrow a few bolts to test fit on my car - stay tuned.
That said, their hardware works as designed.
They are local to me so I will swing by later this week and see if they will allow me to borrow a few bolts to test fit on my car - stay tuned.