zerMATT951

Artie - $0.25ea is correct for the copper 8mm locknuts with 12mm flats. I will also check the availability of 6mm locknuts just-in-case.

Go ahead and count me in for 6 of those stainless cap screws for the x-over pipe, but that's all I'll need as I already have the copper nuts and 16 Saturn studs (cleaned out my local dealer ).

marcoturbo

I'm also interested in a complete kit for my '86 951.

RT930turbo

Added....

87944Turbo - Got your PM, added you to the list
marcoturbo - 1 Turbo Kit
zerMATT951 - 6 cap screws

macnewma

I was under the same impression. I thought that, although the corrosion resistance of stainless is better, the strength and hardness of stainless are lesser than that of the 8.8 and 10.9 bolts. You might want to make sure the S/S will hold up. If you put together a non-stainless kit I would be interested.

RT930turbo

I'm no expert on metals, what does the rest of the group think? I will do some research on this and see what I come up with...

RT930turbo

Double post up there, sorry.

Also the price would most likely reduce if we went to 10.9...now I'm wondering if stainless is a bad idea. ??????

macnewma

Here is some quick info on fastener materials:

http://www.boltdepot.com/fastener-in...Materials.aspx

I am not a fastener expert by any stretch of the imagination. I do know that Porsche used those specific grades for a reason. I can't think of any SS fasteners in our engine bay off the top of my head. I know that the exhaust system won't need the kind of strength that suspension bolts would need, but SS is pretty weak. I would rather have zinc-plated hardened fasteners up to the specs from the factory.

RT930turbo

Here is some info from BoltDepot.com

"Stainless Steel
Stainless steel is an alloy of low carbon steel and chromium for enhanced corrosion characteristics. Stainless steel is highly corrosion resistant for the price and because the anti-corrosive properties are inherent to the metal, it will not loose this resistance if scratched during installation or use.

It is a common misconception that stainless steel is stronger than regular steel. In fact, due to the low carbon content, stainless steel can not be hardened. Therefore when compared with regular steel it is slightly stronger than an un-hardened (grade 2) steel fastener but significantly weaker than hardened steel fasteners."

Heres a link to the Grade markings and tensile strengths, 10.9 is 50% stronger than SS if I am reading this right. http://www.boltdepot.com/fastener-in...ade-Chart.aspx

I have seen a few posts on some random hot rod forums where people complain about twisting the heads off SS header bolts after they have been heat cycled a lot. I wonder if 10.9 is a superior choice...there must be a reason Porsche didn't use stainless.....?

RT930turbo

macnewma......Beat Me To It!!!!!

nice website

haha

zerMATT951

Do we have any mechanical engineers following this thread?

Crazy Eddie

Also, Brian mentioned that you don't want to use SS on the block ( i wanted to use it where the front water neck is because the bolts there have a tendency to rust and that area is known for coolant leaking out where it joins the metal and rubber hoses there.
He said the SS can bond to the aluminum block. So I nixed the SS idea
Also, When I removed my Exhaust bolts I had used a air gun at the end and if you think that the SS will stand up think again .....
I went for 10.9 hardness on a # of pieces and also went with what is referred to as flange bolts because I wanted the larger surface area ( they were pretty pricey )
and finally I went with the standard lengths i.e. 40 mm vs 37 mm there is really no difference They will work fine
Regards
Ed

951Boost

Just for the record, I'm up for whatever metal type the group decides it's best. Too slammed right now to give myself a short course in metallurgy.....sorry

PS- "flange bolts" ARE nice!

SamGrant951

Im with Lou, whatever the group goes with is fine....I do need the studs for my new turbo - any chance of getting these at the same time? Its ok if not, Ill just order those separate.

macnewma

Here is the thread with Z3bra's bolt dissertation:

https://rennlist.com/forums/944-turbo-and-turbo-s-forum/214504-fastener-grades-question.html

RT930turbo

Well, I think I'm sold on the 10.9 metric stuff, does anyone have an objection??