EPIC nuts/studs loosening thread (reposting stupid stuff without reading = warning)

[JasonC SBB]

??

[Splitime]

Me.

[miatamania]

Originally Posted by Splitime

Me.

How.

[Splitime]

I just tightened it all... and checked them after a heat cycle.

Thats it. Random nuts/studs/bolts from a bolt box pile

[Savington]

What are your laptimes in comparison to Spec Miatas on the same track?

[kotomile]

Do you run a gasket between mani and turbo, Splitime?

This is probably completely misguided, and I'll probably be proven wrong in short order, but I just thought of a little theory that I'll run by you engineer types.

So, people say that it's not just vibration which loosens nuts, but also the thermal expansion of the metal. So, in a gasketless connection, there is nothing to compress so the metal simply grows and pushes the nut loose. With a gasket, there's something to compress and the nuts stay put.

Be gentle guys.

[Splitime]

No gasket.

So far the ONE single clean lap time I have vs spec miatas is I'm a second faster? No footage from later even more comfortable sessions... still learning car etc... but yah, ~1-2 seconds below spec miata times I've found.

[y8s]

Originally Posted by kotomile

Do you run a gasket between mani and turbo, Splitime?

This is probably completely misguided, and I'll probably be proven wrong in short order, but I just thought of a little theory that I'll run by you engineer types.

So, people say that it's not just vibration which loosens nuts, but also the thermal expansion of the metal. So, in a gasketless connection, there is nothing to compress so the metal simply grows and pushes the nut loose. With a gasket, there's something to compress and the nuts stay put.

Be gentle guys.

I would say more that the heat expansion stretches the bolts and then when it cools again the nuts are loose even though nothing's turned.

but once you get to that point, it's a losing battle.

[neogenesis2004]

do all you cats with loosening bolts have cast manifolds?

[Splitime]

SS stainless tubular...

[miatamania]

Originally Posted by neogenesis2004

do all you cats with loosening bolts have cast manifolds?

Greddy FTL.

[neogenesis2004]

I'm betting that most or all of the people with this issue are running cast manifolds.

[y8s]

Originally Posted by neogenesis2004

I'm betting that most or all of the people with this issue are running cast manifolds.

higher rate of thermal expansion?

[neogenesis2004]

I'm not a mechanical engineer so I won't guess at reasons. I just have excellent intuition

[Splitime]

You mean a cast manifold and a cast turbine housing both expanding might stretch a stud?

[hustler]

I've noticed that all my BEGi supplied bolts that had the deformation on the end to grip the stud, all can be spun off by hand.

Titanium?
Resmond 907 threadlocker?
Inconel hardware?

some combonation of all that shit?

[neogenesis2004]

If the issue is not the studs themselves then no form of space age metal will help you.

[hustler]

Originally Posted by neogenesis2004

If the issue is not the studs themselves then no form of space age metal will help you.

are we fighting thermal expansion or vibration? Spacemetal may help one of those. If we can find a stud material that will stretch equal to the mild steel or cast iron, then all we have to do is safety-wire for vibration.

[y8s]

nitinol studs?

[neogenesis2004]

Why not just go for adamantium while we are at it?