Originally Posted by hustler
(Post 692786)
I don't know, EGT is in a box. After what I went through on the cast manifold, I'm afraid to drill and tap this manifold.
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Where did you guys order the M6 inconel bolts from?
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What's the difference between Inconel and Nimonic, and why does hustler think Inconel will solve his problems?
How do their CTE's compare? Tensile strength at low and high temps? |
Originally Posted by JasonC SBB
(Post 694165)
Intersting point! Perhaps the safety wire prevents backing out due to vibration, and the low temp bolts with safety wire cannot take the heat.
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Because Inconel has proven to solve this same problem (bolts stretching/relaxing due to high heat) at the manifold -> turbine housing joint
So we use inconel bolts because they do not "soften" or stretch the way stainless steel does (though we expect they expand and contract like any good bit of matter will under heat - they simply do so much more favorably than the SS or other metals do) And we use safety wire to keep the good bolts from vibrating loose. Even though the inconel has a much more favorable heat propery, the heating/cooling of the turbine housing will occasionally cause the inconel bolts to become "free floating" in the housing (where once they were torqued, now they are not even "finger tight" simply because of the heat cycling/expansion between the bolt/housing) The safety wire simply keeps the bolts from loosening when this state is achieved. SS bolts w/o safety wire --> bolts stretch and/or loosen SS bolts w/safety wire --> bolts stretch Inconel bolts w/o safety wire --> bolts loosen Inconel bolts w/safety wire --> tight like a tiger |
Originally Posted by JasonC SBB
(Post 694168)
Maybe the solution is safety-wiring the non-inconel fancy hi temp bolts (Nimonic), which may be easier to drill than inconel.
Originally Posted by JasonC SBB
(Post 694170)
Drill and tap the turbine inlet, not the manifold. That's what I did, after my AVO cast mani cracked through the EGT hole after 7 years.
Originally Posted by dgmorr
(Post 694172)
Where did you guys order the M6 inconel bolts from?
Originally Posted by JasonC SBB
(Post 694174)
What's the difference between Inconel and Nimonic, and why does hustler think Inconel will solve his problems?
How do their CTE's compare? Tensile strength at low and high temps? With me spending so much time in the prototype dept |
Originally Posted by fooger03
(Post 694180)
Because Inconel has proven to solve this same problem (bolts stretching/relaxing due to high heat) at the manifold -> turbine housing joint.
Inconel has the disadvantage of being very difficult to machine. |
Originally Posted by hustler
(Post 691709)
My progression:
Nimonic is a trade name registered by the same company that invented Inconel. I think both are used for bolts inside jet engine turbines. |
Originally Posted by JasonC SBB
(Post 694189)
NIMONIC bolt experiment used NO SAFETY WIRE.
Nimonic is a trade name registered by the same company that invented Inconel. I think both are used for bolts inside jet engine turbines. |
Hey Hussie...here is some food for thought-
OK..big words, right? Well I remember the 'epic studs' thead and the discussion that on a lot of the manifolds (BEGI and FM) that the turbo-to-manifold studs were exposed to the raw exhaust gases causing the difference in material to prematurely get much hotter/expand at a different rate than the turbine housing whereas most others and OEM turbo cars do not have studs/bolts that are in contact with raw exhaust gases. Pretty sound theory if you ask me..though I am no M.E. Anyway. I just replaced my GT28 exhaust hausing and clearly remember that when I pulled the 8 housing bolts off, the tips were black with carbon. I just ran out into the garage and looked at the housing and the 8 bolt holes all go through to the inside where the bolts would be in direct contact with the superheated exhaust gases. Soooooo.....maybe finding a way to shield the bolts from direct exposure? Yes? No? Or you already knew this and it was mentioned somewhere between pages 5 and 9 that I didn't read carefully. |
Originally Posted by Doppelgänger
(Post 694194)
I just replaced my GT28 exhaust hausing and clearly remember that when I pulled the 8 housing bolts off, the tips were black with carbon. I just ran out into the garage and looked at the housing and the 8 bolt holes all go through to the inside where the bolts would be in direct contact with the superheated exhaust gases.
Hey hustler, try making a cool looking crane with heim joints to the turbine housing. That'd fix it. Full circle time again baby let's keep this thread rollin! |
Originally Posted by JasonC SBB
(Post 694189)
Nimonic is a trade name registered by the same company that invented Inconel. I think both are used for bolts inside jet engine turbines. I'm still naming my first born Nimonic. |
Oooops..6....it's SIX dammit....6. I wasn't paying attention to what finger I was using when I typed that.
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Maybe he should drill for 8 holes then.
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What about drilling/tapping a new set of holes that don't go all the way through? Maybe that + inconel bolts? I'm typing on a whim and haven't thought about the downside or problems with doing so.
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Originally Posted by TurboTim
(Post 694197)
Fuck now there's 8 bolts?! damnit.
Hey hustler, try making a cool looking crane with heim joints to the turbine housing. That'd fix it. Full circle time again baby let's keep this thread rollin!
Originally Posted by TurboTim
(Post 694198)
Damnit Jason you got me going now. http://en.wikipedia.org/wiki/Nimonic
I'm still naming my first born Nimonic.
Originally Posted by Doppelgänger
(Post 694199)
Oooops..6....it's SIX dammit....6. I wasn't paying attention to what finger I was using when I typed that.
Originally Posted by TurboTim
(Post 694200)
Maybe he should drill for 8 holes then.
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Originally Posted by Doppelgänger
(Post 694205)
What about drilling/tapping a new set of holes that don't go all the way through? Maybe that + inconel bolts? I'm typing on a whim and haven't thought about the downside or problems with doing so.
Originally Posted by hustler
(Post 694209)
Drunk?
What about "Moon Unit"? I will. |
Originally Posted by TurboTim
(Post 694225)
How about drilling completely through the turbine housing and using through bolts.
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Precision turbo's housing uses M8x1.5x16 hardware
no info if anyone has a similar problem |
LOL is Moon Unit Zappa that famous?
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