[DeTomaso] Stress-relieving Rims

[Will Kooiman]

BTW, I have an 8" Campy that leaks air.

I can't see the hole, but if I mount a tire, and fill it with air, you can
feel the air coming out.  It isn't on the bead, stem, etc.  You can feel
it coming from the middle of the metal.
--
Will





On 8/17/13 5:51 PM, "Scott Bell" <scott at saccrestorations.net> wrote:

>Thanks Jack, that makes a lot of sense.
> 
>From: JDeRyke at aol.com [mailto:JDeRyke at aol.com]
>Sent: Saturday, August 17, 2013 12:40 PM
>To: scott at saccrestorations.net; detomaso at poca.com
>Subject: Re: [DeTomaso] Stress-relieving Rims
> 
>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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