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Stressbar discussion...



"Another point to consider is that if your outer strut tower is deflected outwards 0.20" by this 333
lb force, then you just lost 0.5? of negative camber!  If it deflects 0.42" you have lost a full
degree of negative camber. "

This is the quote. He doesn't state any measured deflection. He's only equating deflection to camber
change. Both deflections, 0.20" and 0.42",  are hypothetical.
I'm merely pointing out that if the chassis was so weak that it had that much deflection the extreme
movement and resultant stresses (beyond the material yield point) would fatigue and crack the metal
very quickly.
The actual deflections can't be as high as his examples so the camber change due to deflection is
proportionally much less.
Just making the point that he's exaggerating the possible camber change due to deflection.
Dan


----- Original Message -----
From: "David Utley" <mr.utility@highstream.net>
To: "Dan Bubb" <jdbubb@ix.netcom.com>
Cc: <scirocco-l@scirocco.org>
Sent: Friday, March 05, 2004 5:13 PM
Subject: Re: Stressbar discussion...


> I re-read the article, and I there is still something not right...  What read
> said that --if-- it deflected .42", you would have a full degree of camber
> loss.  In his situation, he saw .20".  Now did I misread something?
>
> LMK,
>   David
>
> Quoting Dan Bubb <jdbubb@ix.netcom.com>:
>
> > > Quoting David Utley <mr.utility@highstream.net>:
> >
> >
> > > Two questions that I erased and should not have...
> > >
> > >   1)  What is the source of your claim that his estimates are wrong for
> > the
> > > amount of deflection at the front strut tower?
> > >
> > >   2)  How is it that his example is 'ridiculous'?  I can understand that
> > you
> > > may not like/appreciate his example, so therefore why do you not
> > appreciate
> > > it, and furthermore, why is it ridiculous?
> > >
> > > Thanks for your time...
> >
> > The answer is the same for both questions.
> > If the shock tower were moving .42" everytime the car hit max corner force
> > the metal would fatique
> > and crack in very few cycles. So, his pronouncment that you could get 1
> > degree of camber deflect if
> > a gross overstatement.
> > Dan
> >
> > >
> > > Quoting David Utley <mr.utility@highstream.net>:
> > >
> > > >
> > > >
> > > > Quoting Dan Bubb <jdbubb@ix.netcom.com>:
> > > >
> > > > > 0.2 degree!
> > > > >
> > > > > Also, this example has absolutely nothing to do with the analysis one
> > > > would
> > > > > do for a rear stress bar
> > > > > on a Scirocco.
> > > > > Dan
> > > > >
> > > >
> > > > Neither did my example, which is on a Rabbit, if you remember.  But we
> > are
> > > > arguing about different things, too...  My experience was with the
> > Neuspeed
> > > > bar, which has poly inserts on the top...  You never did respond to
> > that...
> > > >
> > > >
> > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "David Utley" <mr.utility@highstream.net>
> > > > > To: "Aaron" <aaron@brixtonhill.demon.co.uk>
> > > > > Cc: "Scirocco Mailing List" <scirocco-l@scirocco.org>
> > > > > Sent: Thursday, March 04, 2004 5:21 PM
> > > > > Subject: Stressbar discussion...
> > > > >
> > > > >
> > > > > >   Here is a link for some discussion on our topic, although it only
> > > > deals
> > > > > with
> > > > > > the front...  I will post more pertinent sites as I find them...
> > > > > >
> > > > > >
> > > >
> > http://www.e30m3performance.com/myths/Strutbar_Theory/strut_bar_theory.htm
> > > > > >
> > > > > >
> > > > > > --