Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
> SS exchangers
StratPlayer
post Jul 6 2017, 07:11 AM
Post #1


StratPlayer
****

Group: Members
Posts: 3,324
Joined: 27-December 02
From: SLC, Utah
Member No.: 27
Region Association: Rocky Mountains



Great write up PMB has done on SS exchangers. My car is in for some work and they discovered this problem with my exchangers.

Folks with SS exchangers should give a look.

https://www.facebook.com/PMBPerformance/pho...9673193/?type=3
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GeorgeRud
post Jul 6 2017, 07:47 AM
Post #2


Advanced Member
****

Group: Members
Posts: 3,725
Joined: 27-July 05
From: Chicagoland
Member No.: 4,482
Region Association: Upper MidWest



Important information! Please be sure to have a CO detector in the car.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mark Henry
post Jul 6 2017, 07:57 AM
Post #3


that's what I do!
***************

Group: Members
Posts: 20,065
Joined: 27-December 02
From: Port Hope, Ontario
Member No.: 26
Region Association: Canada



QUOTE(GeorgeRud @ Jul 6 2017, 09:47 AM) *

Important information! Please be sure to have a CO detector in the car.


Yep I have seen this issue, the ears are the weakest link on SSI's.
If damaged they should be TIG welded and the ends always need to be squared up.

Don't be a gorilla with a ratchet, get a torque wrench, if it doesn't seal up correct the problem don't just keep cranking.

If you want the piece of mind of a CO2 detector Aircraft Spruce sells nifty little stick on buttons that you can put on your speedo, etc.
They only last for about 18 months, but are dirt cheap.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
02loftsmoor
post Jul 6 2017, 07:59 AM
Post #4


Senior Member
***

Group: Members
Posts: 577
Joined: 26-June 11
From: Ft. Worth TX
Member No.: 13,243
Region Association: Southwest Region



I haven't been on in a while,, what's going on??
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Shadowfax
post Jul 6 2017, 08:48 AM
Post #5


Show us the meaning of haste
***

Group: Members
Posts: 509
Joined: 19-January 15
Member No.: 18,340
Region Association: South East States



Yep. Mine looked almost that bad. There were some hard-to-see cracks around the ears too. All fixed now but was an expensive lesson. (IMG:style_emoticons/default/welder.gif)

Attached Image

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post Jul 6 2017, 09:39 AM
Post #6


914 Guru
*****

Group: Members
Posts: 5,262
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California



This is a typical result of crevice cracking from the weld originally and poor fabrication and post passivation of CRES.

Don.t need a macrograph to tell.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914_teener
post Jul 6 2017, 09:40 AM
Post #7


914 Guru
*****

Group: Members
Posts: 5,262
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California



Mine did the exact same thing.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Jul 6 2017, 10:12 AM
Post #8


Jerry
*****

Group: Members
Posts: 7,154
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None



Mine cracked as well.


Attached image(s)
Attached Image
User is online!Profile CardPM
Go to the top of the page
+Quote Post
914_teener
post Jul 6 2017, 10:45 AM
Post #9


914 Guru
*****

Group: Members
Posts: 5,262
Joined: 31-August 08
From: So. Cal
Member No.: 9,489
Region Association: Southern California



Here is how to fix it. These should be TIG welded only with Argon and a large diffused gas cup.

Mark the location of the ear BEFORE removing anything.

I welded mine with a make do fixture sorry no pictures.
.I did it right before I got married.

Clean the pipe and parts THOUROUGHLY until the passive layer of the stainless is bright inside the exhaust and out.


Plug the exhaust pipe at one end and make a purge chamber from a tee on your flowmeter. This will fill the pipe with Argon so the back side of the weld will be free from oxidation or inclusions.

Reweld the ear on the fixture ....I used an old head.

Tack it all up post purging your tack welds with the TIG torch.

Weld it ALL around to avoid any crevices.

You will have to re true the mating surfaces as just this little welds will want to move the stress drawn tubing as the welding will do this so avoid avoid overheating the weld.

Sorry.... no pics but this is what I did and no problems since.

I saw this particular weld as bad manufacturing design.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Jul 6 2017, 11:22 AM
Post #10


Chimp Sanctuary NW. Check it out.
***************

Group: Members
Posts: 22,238
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch



Over torquing to cure a leaky he does a nice job of tearing the hoops away. Over trueing the pipe tops doesn't help. Mark with a black sharpie and use a light touch with a large file.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
North Coast Jim
post Jul 6 2017, 01:24 PM
Post #11


Member
**

Group: Members
Posts: 339
Joined: 11-December 15
From: Northern Ohio
Member No.: 19,450
Region Association: MidAtlantic Region



Both of mind cracked the same way. One was welded and I couldn't get it sealed again. Probably due to stress on one side of the pipe due to the welding operation and it's ever so slightly bent out of position. Won't try it again.
So I've bought two more. Wish me luck...................and I am using the 18ft Lb torque with a quality ratchet and ensuring there are no burrs on the fastening surface.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 28th April 2025 - 06:25 AM