[DeTomaso] Stress-relieving Rims

Sat Aug 17 16:38:57 EDT 2013

Please send your methods so we can all do it.

Michael
On Aug 17, 2013 3:40 PM, <JDeRyke at aol.com> wrote:

> In a message dated 8/17/13 12:14:38 AM, scott at saccrestorations.net writes:
>
> > Why is this needed? Are people having problems with Campy rims breaking?
> >
>
> Yes. Stresses accumulate and develop into cracks starting at the numerous
> internal pores, and the wheel can separate into pieces even if dismounted
> and
> stored on a shelf. This HAS happened. The stress relief temp for magnesium
> is so low one can do it in a home oven safely. OK- so maybe you don't care
> about the common 7x15s but 8x15s are beginning to be scarce and it is
> possible even on the very pricey 10" Campys too.
> I've been advocating stress relief since the early '90s when I worked for
> Lockheed, particularly if the wheels have been weld-repaired. Magnesium can
> be TIG-welded but the heat-expansion rate is so great, my pro-welder said
> 'it was like the wheel was trying to crawl off the table under the
> torch'....
> And all that generates even more internal stress. Easy to do, can't hurt
> and the only cost is to refinish the paint afterwards. Call it 'cheap
> insurance'.   Good luck- J Deryke
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