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The grade 10.9 or 8.8 bolts/nuts to bolt the Pumaspeed manifold to Turbocharger ?

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oudenaarde
#1
Hello,

I want to install my Pumaspeed manifold and X-27 Hybrid Turbocharger on my Fiesta ST 180.

Before I begin to install it, I have a question:
Which bolts should I use that bolt the Pumaspeed manifold to the X-27 Hybrid Turbocharger? The grade 10.9 or 8.8 bolts/nuts?

Kind Regards
 


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Campbell
#3
I bought a set of Stage 8 locking fasteners for the DHM manifold I'm waiting on.

I am not sure how they compare to 8.8 or 10.9 but since the job is only to hold on a manifold, I think the locking feature is the key attribute.

When headers heat cycle, the bolts get stretched and relaxed, stretched and relaxed, again and again. Usually rust will be enough to keep them from loosening but if not, the Stage 8 system will.

If you just want budget bolts, anything as good as the metric equivalent of an SAE grade 5 should do fine.

If you can find it, a 12 point or inverted torx head will be harder to round off than a 6 point head. Use anti-seize if you are worried about having to remove a stuck bolt.
 


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Campbell
#4
Alloy stainless steel, high resistance to temp and corrosion.

http://arp-bolts.com/kits/Bulk.php?PL=89&M=1&W=*&D=*&P=*&WS=*
For some reason I was thinking manifold to cylinder head, probably because the DHM manifold uses a V-band clamp for the turbo.

If you have yucky bolts, stainless will resist the heat a bit better but it makes the anti-seize more critical because stainless likes to gall.

I think my Stage 8 bolts are some grade of stainless and they offer turbo bolt kits so they are still an option to look at.
 


Sekred

1000 Post Club
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Mid North Coast
#5
For some reason I was thinking manifold to cylinder head, probably because the DHM manifold uses a V-band clamp for the turbo.

If you have yucky bolts, stainless will resist the heat a bit better but it makes the anti-seize more critical because stainless likes to gall.

I think my Stage 8 bolts are some grade of stainless and they offer turbo bolt kits so they are still an option to look at.
Typically stainless alloy is used because of its ability to resist corrosion more than any other reason, certainly not for tensile strength. Coated bolts, Zinc and phosphate don't stand up very well when used in turbo applications in my experience. The heat just kills them and a few heat cycles makes removing them without galling, seizing and then breaking about zero in my experience.
 




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