New inconel exhaust studs and locknuts for myGriso

I hate rusted exhaust studs, especially on the GRiSO, (which prefers gold or silver jewelry), so I've bought shiny M8x1.25x45 inconel studs and locknuts that shouldn't rust.

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$15 each from [You must be registered and logged in to see this link.]  part number XTR420052-45

I should mention Pete Roper of Motomoda here.

I initially emailed Pete wanting to buy some studs from him, not realizing he was still overseas on holiday.

Pete took the time to reply advising that Motomoda doesn't usually stock exhaust studs, advising me of the sizes I needed and where to look for some and adding that he would be happy to procure some for me when he returns to Australia.

How awesome is that effort for some low value exhaust studs ?

Thanks Pete!

techman-001 wrote:

......studs and locknuts that shouldn't rust.

If it's stainless steel it won't rust, otherwise you're in the same boat in a few years...

Grisonut wrote:

techman-001 wrote:

......studs and locknuts that shouldn't rust.

If it's stainless steel it won't rust, otherwise you're in the same boat in a few years...

It's Inconel, which is used for turbo manifolds, it's tough and rust free. It won't stretch like stainless will.
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Inconel is a family of austenite nickel-chromium-based superalloys. Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments subjected to pressure and heat.

Also I believe the shit they build the containment rings around the fans in jet engines out of! It's as tough as buggery! You really want something pretty effective between you and a fan blade if they decide to come apart!

Pete

techman-001 wrote:

Grisonut wrote:

techman-001 wrote:

......studs and locknuts that shouldn't rust.

If it's stainless steel it won't rust, otherwise you're in the same boat in a few years...

It's Inconel, which is used for turbo manifolds, it's tough and rust free. It won't stretch like stainless will.
[You must be registered and logged in to see this link.]
Inconel is a family of austenite nickel-chromium-based superalloys. Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments subjected to pressure and heat.

I apologize as I get confused with the language at times.
Since I didn't know inconel was a special alloy, I thought it meant the stud type. lol
Learn some everyday...
Carry on folks, do not mind me...

Pete Roper wrote:

Also I believe the shit they build the containment rings around the fans in jet engines out of! It's as tough as buggery! You really want something pretty effective between you and a fan blade if they decide to come apart!

Pete

I found some very nice Titanium exhaust studs, which I'd have preferred to use as a GRiSO exhaust isn't very demanding making Inconel way overkill, but they were in the USA and I'm in a bit of a hurry. The Ausie firm I bought the Inconel studs from delivered to my location next day.

Not to mention the typically ridiculously high shipping costs from the USA, where the 4 studs would arrive rolling around in a empty 4kg (volume) capable carton.

The Ti studs are blued, very light, won't rust or break, even have a Allen key in the stud to screw it in or out with ... and would be perfect with a Ti exhaust ... what's not to love ? Seems they may stretch over time, I guess that's something I wouldn't love.

Note: this pic is for M10 studs which is incorrect for the GRiSO which needs M8x1.25x45mm.
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Also I believe the shit they build the containment rings around the fans in jet engines out of! It's as tough as buggery! You really want something pretty effective between you and a fan blade if they decide to come apart! wrote:

Jet engines are full of the stuff, as its heat strength properties are well superior with the only drawback being the weight.



Inconel is also used as bars in American prisons. They use 1 inch round bar as its very hard to cut with hand tools.
I was involved indirectly in the build of the Super max at Goulburn. The plan was to use the same spec as the USA but when we looked at the budget and the price of inconel bar 1 inch round at a $1 per inch supplied. In a gaol (jail) that adds uo.

Ti Titanium. From my experience I would never use it with the bolt under tension. I have seen the torque (tension) come off the bolt over time. Fine in a race setup where parts are regularly removed and bolts are retorqued but in a set and forget situation. Far from ideal

wardest wrote:

Jet engines are full of the stuff, as its heat strength properties are well superior with the only drawback being the weight.

Inconel is also used as bars in American prisons. They use 1 inch round bar as its very hard to cut with hand tools.
I was involved indirectly in the build of the Super max at Goulburn. The plan was to use the same spec as the USA but when we looked at the budget and the price of inconel bar 1 inch round at a $1 per inch supplied. In a gaol (jail) that adds uo.

Ti Titanium. From my experience I would never use it with the bolt under tension. I have seen the torque (tension) come off the bolt over time. Fine in a race setup where parts are regularly removed and bolts are retorqued but in a set and forget situation. Far from ideal

Thanks for the info.
As the Inconel exhaust studs will probably last the life of my GRiSO, it won't be getting the nice blue Ti studs anyway.

Hi,

Could you kindly advise where you got these from? I'll be needing next Tuesday.

Great to be getting all this knowledge from GRiSO Ghetto. I thought it was a USA site "but then was found!"

Cheers,
Ross

Doh!

Apologies, went back to the first post and saw the link was there.
Thanks

moby wrote:

Doh!

Apologies, went back to the first post and saw the link was there.
Thanks

No worries, the vendor is in Sydney,  and post Express Post ($15) next day after your order, so I had them in the Northern Rivers the following day.

NOTES (some observations):
I just tried the new studs( as I haven't fitted them yet) and found you have two choices.

1) screw the long threaded section into the head: This leaves 3 - 4 threads proud of the head, and necessitates a 3 - 4 mm spacer under the locknut or you'll run out of thread I think. This is the 'prettiest' option as less thread protrudes thru the locknut.
2) screw the shorter threaded section into the head: This requires no spacer but leaves around 9mm stud thread proud of the locknut. It also doesn't use up all of the available thread in the head as it's a deep hole.

In either case, I think hacksawing the Inconel stud shorter is out of the question.

Interesting note 1: One original stud was very tight and two of the small original stud nuts (tightened against each other with all my strength) just slipped trying to withdraw the stud.
I replaced them with the larger 13mm Inconel nuts, using a captive ring spanner on the inner nut as I did above, and the stud was so easy to unscrew I though they were also slipping at first..

Interesting note 2: Multigrips tightened to the max (on the non threaded section) gouge the original steel studs, but don't seem to affect the Inconel studs.

Hmm, now I'm thinking I'll get out the Dremel Tool and some *very thin" abrasive cut-off discs and see if I can cut 3 -4 threads off the long end of a the Inconel stud, to make it just right for the GRiSO.

More later, if you never hear from me again you'll know that :-
- your prayers have been answered
-  the Dremel exploded
- both of the above

techman-001 wrote:

I hate rusted exhaust studs, especially on the GRiSO, (which prefers gold or silver jewelry), so I've bought shiny M8x1.25x45 inconel studs and locknuts that shouldn't rust.

[You must be registered and logged in to see this image.]

$15 each from [You must be registered and logged in to see this link.]  part number XTR420052-45

Looks like screwing the Inconel stud, short threaded end into the GRiSO head is the safest option.

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These are the two choices, and I can't see that cutting  3 -4 threads on the Inconel studs, (so as to have less thread protruding thru the locknut) would be worth it ?

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