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> Copper flanged exhaust nuts, DO NOT USE THEM
VaccaRabite
post Jun 3 2023, 07:56 PM
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I have never pulled an exhaust stud before while doing pipes. This evening I’m 4 for 4. These copper flanged nuts locked on the studs and there was 100% no getting them off without the studs coming with them.

Going back to using just regular nuts with 12mm flats. So much for trying to get the “right” part.

Edit to add details:
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The nuts in question are commonly available and sold as exhaust nuts. I got mine from Auto Atlanta - but many places sell them. The have a copper color to them and the bore is slightly oval. The are designed to lock on to the stud - which I did not know at the time. They go on tight and you can not remove them without pulling the stud.

There are flanged nuts that work fine.

Kinda furious with myself right now.

Continuing to live life as an object lesson for others…

Zach
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bkrantz
post Jun 3 2023, 08:20 PM
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Did you use anti-seize?
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VaccaRabite
post Jun 3 2023, 08:22 PM
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QUOTE(bkrantz @ Jun 3 2023, 10:20 PM) *

Did you use anti-seize?

High temp copper antiseize. The good stuff.
I had to put the studs in a vise to get the nuts off. They were locked on.

Zach
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mgphoto
post Jun 3 2023, 08:23 PM
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QUOTE(bkrantz @ Jun 3 2023, 07:20 PM) *

Did you use anti-seize?

Doesn’t matter, they are a crush fit, for a stock vehicle don’t use them.
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VaccaRabite
post Jun 3 2023, 08:26 PM
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Car started popping a lot on decel today while I was driving around. So, exhaust leak. Once on the lift I found the #4 pipe had cracked at the ears.

Once I got the pipe down, the crack went 3/4 of the way around the entire circumference of the pipe! I was going to weld it, but it’s an older set of SSIs I got used. I don’t know that they are worth welding. Thoughts?

Zach
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mgphoto
post Jun 3 2023, 09:09 PM
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QUOTE(VaccaRabite @ Jun 3 2023, 07:26 PM) *

Car started popping a lot on decel today while I was driving around. So, exhaust leak. Once on the lift I found the #4 pipe had cracked at the ears.

Once I got the pipe down, the crack went 3/4 of the way around the entire circumference of the pipe! I was going to weld it, but it’s an older set of SSIs I got used. I don’t know that they are worth welding. Thoughts?

Zach

Tig is best, you need to flood the inside of the pipe with the shielding gas to prevent oxygen from attacking the weld.
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r_towle
post Jun 3 2023, 09:15 PM
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Or

Headers and exhaust from Foley?
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VaccaRabite
post Jun 3 2023, 09:37 PM
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QUOTE(r_towle @ Jun 3 2023, 11:15 PM) *

Or

Headers and exhaust from Foley?

I eventually want heat. I drive too much in fall and winter before they lay down the salt.
But I am considering it. I know Joe would lend me his CFR header system if I asked since his car is under the knife.
Zach
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r_towle
post Jun 3 2023, 11:01 PM
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I thought it had heat?

If you are jammed I will go take a look in the barn
Which side/version do you need?

1.7 or 2.0 liter boxes?
Remind me…which one curves up?

I have at least two spare sets…

Rich
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mepstein
post Jun 4 2023, 04:35 AM
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QUOTE(r_towle @ Jun 4 2023, 01:01 AM) *

I thought it had heat?

If you are jammed I will go take a look in the barn
Which side/version do you need?

1.7 or 2.0 liter boxes?
Remind me…which one curves up?

I have at least two spare sets…

Rich

1.7//1.8 curve up
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ClayPerrine
post Jun 4 2023, 06:53 AM
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There is an Aluminized Mercedes Benz flanged exhaust manifold nut that works great. They stay tight, but don't seize to the stud, and the flange means you can get a socket on them.

I don't have the part number but @partsguy22 will know.


Clay
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rhodyguy
post Jun 4 2023, 07:08 AM
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Are those the VW style ones? With the slightly oval (that seizes the stud) hole? MOM on the stud helps.
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rhodyguy
post Jun 4 2023, 09:08 AM
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I think you will find 8 of these more to your liking.


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sixnotfour
post Jun 4 2023, 09:24 AM
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Im not a type 4 guy , But Ive seen more cracked SSI's than good ones...
In Fact I have a perfect set appearance wise.. and are cracked exactly as Zacs are..
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rhodyguy
post Jun 4 2023, 09:30 AM
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Torqueing the shit out of the nuts, to cure a leak, is a sure fire way to tear the ears off. Take them up 5#s at a time, to 20#s, in an X pattern. You don’t want to build in a leak from the git go.
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JamesM
post Jun 4 2023, 01:35 PM
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QUOTE(rhodyguy @ Jun 4 2023, 07:08 AM) *

I think you will find 8 of these more to your liking.


(IMG:style_emoticons/default/agree.gif) Those ACN 10mm flange nuts are the ticket! I use them for almost everything now

I learned the hard way with those copper nuts like 15 or so years ago. Not sure why vendors still sell them, they are the absolute worst
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DC_neun_vierzehn
post Jun 4 2023, 03:48 PM
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QUOTE(JamesM @ Jun 4 2023, 01:35 PM) *

QUOTE(rhodyguy @ Jun 4 2023, 07:08 AM) *

I think you will find 8 of these more to your liking.


(IMG:style_emoticons/default/agree.gif) Those ACN 10mm flange nuts are the ticket! I use them for almost everything now

I learned the hard way with those copper nuts like 15 or so years ago. Not sure why vendors still sell them, they are the absolute worst


Are these what y'all are talking about?

https://vwparts.aircooled.net/ACN-Flanged-R...-p/acn-nuts.htm
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sixnotfour
post Jun 4 2023, 03:53 PM
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QUOTE(DC_neun_vierzehn @ Jun 4 2023, 03:48 PM) *

QUOTE(JamesM @ Jun 4 2023, 01:35 PM) *

QUOTE(rhodyguy @ Jun 4 2023, 07:08 AM) *

I think you will find 8 of these more to your liking.


(IMG:style_emoticons/default/agree.gif) Those ACN 10mm flange nuts are the ticket! I use them for almost everything now

I learned the hard way with those copper nuts like 15 or so years ago. Not sure why vendors still sell them, they are the absolute worst


Are these what y'all are talking about?

https://vwparts.aircooled.net/ACN-Flanged-R...-p/acn-nuts.htm


yup @Rhodyguy has a bunch,, hit him up... I got 100 from him..
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VaccaRabite
post Jun 4 2023, 06:51 PM
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QUOTE(rhodyguy @ Jun 4 2023, 11:30 AM) *

Torqueing the shit out of the nuts, to cure a leak, is a sure fire way to tear the ears off. Take them up 5#s at a time, to 20#s, in an X pattern. You don’t want to build in a leak from the git go.


I always use a 1/4 inch mini-driver on the exhaust nuts to try and avoid this. All the used SSIs being old and heat cycled a million times does not help. And those fucking flanged pinch nuts are so tight that they throw the torque settings way off.

Lessons learned - a couple of them.

Zach
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porschetub
post Jun 4 2023, 07:34 PM
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QUOTE(ClayPerrine @ Jun 5 2023, 01:53 AM) *

There is an Aluminized Mercedes Benz flanged exhaust manifold nut that works great. They stay tight, but don't seize to the stud, and the flange means you can get a socket on them.

I don't have the part number but @partsguy22 will know.


Clay

(IMG:style_emoticons/default/agree.gif) used the BMW version of these on my "6" headers ,really good and don't loosen up , got them from Pelican for chump change each,seem to remember brass and steel don't play well together due to constant heat cycling.
After extracting 4 bad head exhaust studs I wasn't prepared to use the wrong nuts..end of story.
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