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Registered Driver
Helmsy's Avatar
Join Date: May 2008
Location: South Australia
Posts: 281
Fixing or replacing is fine but it would be nice to know what actually caused it to eliminate it happening again.
'85 930 - Black on Black
'95 993 Turbo - Silver
Old 07-02-2012, 08:09 PM
  Pelican Parts Technical Article Directory    Reply With Quote #21 (permalink)
Garage Queen
PorscheGAL's Avatar
Join Date: Dec 2008
Location: Central SC
Posts: 1,482
I agree. Since I am replacing all the bushings in the front, I have a pretty good view from the bottom. I am not finding any damage elsewhere. This is also the first time I have had it up on my new lift so I am not able to say when it happened. I couldn't say whether it was before I bought it (2009) or after.
My minions:'86 911 Targa 3.4, '87 930, '05 Lotus Elise,
'12 Boss 302, '13 Focus ST, '16 Focus RS
Old 07-03-2012, 03:35 AM
  Pelican Parts Technical Article Directory    Reply With Quote #22 (permalink)
Smart quod bastardus
fredmeister's Avatar
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,163
Originally Posted by PorscheGAL View Post

I found a crack on the crossmember subframe where the torsion bar retaining cap rest. Obviously, it will need to be welded, but how? Does the subframe need to come off or can it be welded in place?

I don't know how this could happen. I'm in the middle of a suspension refresh and found this problem.

Side view

bottom view
There is another crack in the top picture in the web of the piece that concerns me more. Problem with a crack, especially in an aluminum part that is susceptible to fatigue failure, is that once it is cracked it fails quickly.
You have to realize that the load from the torsion bar is reacted at the steel insert in the upper corner of the crossmember so you dont want it cracking in that area.
If it were me, I would go with the replacement piece and avoid using the welded piece.

1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 07-04-2012, 06:23 AM
  Pelican Parts Technical Article Directory    Reply With Quote #23 (permalink)
Registered User
Join Date: Jan 2008
Location: sunny buffalo
Posts: 391

I would never trust a welded suspension part. Aluminum is a funny metal, especially when welding. Alot of heat is generated and the grain structure will be altered. I am sure many of these exist in the parts yards.

Good luck
Old 07-05-2012, 11:37 AM
  Pelican Parts Technical Article Directory    Reply With Quote #24 (permalink)

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