[DeTomaso] Stress-relieving Rims
Stephen Nelson
steve at snclocks.com
Sun Aug 18 12:31:58 EDT 2013
Mike - I was thinking the same way until I found the articles I referenced,
and until I picked up one of the rims I bought and was surprised at how
light it was. The tech articles I referenced do point out potential issues.
Given my background petroleum refining, I have been amazed at the impact
both corrosion and stress can have on the potential for catastrophic failure
of seemingly appropriate metals.
OK, flip side, J Deryke's background includes mill-spec - which is designed
to protect folk from failures in equipment that is pushed to the limits. Or
past the limits. A tough environment. But, on the other side, do we really
know how hard our rims have been pushed - since most of us were not lucky
enough to have owned the car since new?
Reminds me of an XKE I bought - the rear suspension mounting points were
moved over more than an inch, the fronts not as bad. I later found that the
car had been involved in a roll-over. Story was that it slid sideways into
a curb at a pretty healthy speed. It flipped and landed on its wheels.
What ever the case, gads, those rims had to have taken a beating.
So, since the procedure is not all that cumbersome for one who is going to
restore rims anyway, I will do the heat treat.
End of the day I am so pleased that this forum has experienced folks named
Mike (Drew, Short, Thomas - and I am sure there are more), and folk like J
Deryke to offer guidance for all of us.
Stephen Nelson
-----Original Message-----
From: Mike Drew [mailto:MikeLDrew at aol.com]
Sent: Saturday, August 17, 2013 9:13 PM
To: Scott Bell
Cc: Stephen Nelson; <detomaso at poca.com>
Subject: Re: [DeTomaso] Stress-relieving Rims
I have only heard of a few failures and all of them were after a violent
encounter with a pothole or something like that. My coffee table Campy is
one such example as it has a hairline crack that prevents it from holding
air.
But I find the notion that a standard Campy wheel is somehow fragile to be
ridiculous.
Mike
Sent from my iPhone
On Aug 17, 2013, at 0:14, "Scott Bell" <scott at saccrestorations.net> wrote:
> Why is this needed? Are people having problems with Campy rims breaking?
>
> -----Original Message-----
> From: detomaso-bounces at poca.com [mailto:detomaso-bounces at poca.com] On
Behalf Of Stephen Nelson
> Sent: Friday, August 16, 2013 12:20 PM
> To: detomaso at poca.com
> Subject: [DeTomaso] Stress-relieving Rims
>
> Will stress-relieving original Campy rims at 375 F damage the original
> paint?
>
>
>
> Stephen Nelson
>
>
>
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> From: MikeLDrew at aol.com [mailto:MikeLDrew at aol.com]
> Sent: Wednesday, July 03, 2013 3:36 PM
> To: steve at snclocks.com
> Cc: detomaso at poca.com
> Subject: Re: [DeTomaso] Rim Offsets
>
>
>
>
> In a message dated 7/3/13 9 29 36, steve at snclocks.com writes:
>
>
>
>
>
>
> Mike - thanks for the extensive comments. I do plan to drive 5332 for a
> while, get used to it and see how it all hangs together.
>
> Right - scrub radius. As I understand it, increasing scrub radius makes
it
> easier to park the car but more sensitive to external forces acting on the
> tires when rolling down the highway - like uneven brake application. Oh,
> and "excessive" scrub requires more steering effort when going down the
road
> and increases the "feel" of the steering.
>
> In my feeble brain, if the inside of the rim is at the same place with
both
> 7 and 8 inch wide rims,
>
>
>>>> ...which it's not...
>
>
>
>
>> well, going to an 8 inch rim increases scrub radius by a quarter inch.
Of
> course, I don't know that inside edge of 7 and 8 inch rims are at the same
> point. But, since you indicate that the 8 inch rims improve handling, I
> assume this means that the offset is increased a bit. You indicate that
> increasing scrub radius improves handling - does that include reducing
> tramlining? Or am I really just asking too nit-picky of questions?
>
>
>>>> You're absolutely asking too nit-picky of questions...but that's why we
> are all here. We love this stuff! :>)
>
> The outside of the wheels is in the same place. The 8-inch wide wheels
are
> one inch wider on the inside. If the tire size is the same (that is, you
> take a tire off the 7-inch wheel and put it on the 8-inch wheel), the
center
> of the tire is moved inboard by 1/2 inch. That makes a fair difference.
>
>
>
>
>> From your e-mail I conclude that a set of four 8 inch wide original rims
> is the way you would recommend for my situation - if the Coddingtons leave
> me feeling like I would want to make a change?
>
>
>>>> Yes, although it will be difficult to buy a set of four, 8-inch wheels.
> You might wind up buying two sets of 7s and 8s to get there, and then
> selling the 7s to some Mustang guy. Alternately, the easy solution would
be
> to just buy one set and put them on the car.
>
>
>
>
>> Which Coddingtons. The gentleman who put them on told me that they were
> special, an early set with a flat center section instead of the dished
shape
> of the later ones. This apparently requires unusual lug nuts which are
> counter sunk. I am speaking from my notes here, and will have to see what
I
> can figure out when Passport drops it off this afternoon.
>
> See what you think.
>
<http://www.provamo.com/Members/Registry/RegistryImages/RTHPNNU05332/RTHPNNU
> 05332.asp> 5332
>
>
>>>> That is a VERY nice-looking car! I assumed you were speaking about
> Coddington's Campagnolo clones, as opposed to these, rather more generic
> (but very striking) wheels.
>
>
>
>
>> Looking at the pictures one more time, I will have to see how it drives
and
> rides. You are right - gads, good looking rims.
>
>
>>>> Yes, these look quite good indeed. My earlier comment was that their
> current-production Campagnolo wheels are revolting to look at...but these
> are a completely different story.
>
> I think when you drive the car, you will quickly get used to it and enjoy
> it. There's a lot to be said for having a lot of traction and feeling
> planted in the corners, rather than skating around as you would on
> old-school, low-tech tires.
>
> Mike (who skates around on old-school, low-tech tires....)
>
>
>
>
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