More..Upper stress bar questions

[Larry" <rocco16v@netzero.com (Larry)]

Yes, I considered the additional benefits, and the 4-point WOULD reduce
vertical movement.  The question then beomes:  does reducing z-axis movement
improve handling?  Maybe a little.  Maybe enough to warrant using the
4-point, even.
I will say this: neither the 4-point, a 3-point, nor a 2-point will HURT
anything! And they look real racey, which may be reason enough to buy and
install one! :)

Larry

> I understand your point when speaking of the two point bars, but have you
> taken the 4 point Neuspeed bar into consideration?  Just wondering.
>
> Eric
> "Good, bad...I'm the guy with the gun!"
> http://www.geocities.com/blitzkrieg16v
> AOL IM:  OneSixV
> http://www.geocities.com/onesixv
>
> On Sat, 15 Jun 2002 07:06:31 -0700 "Larry" <rocco16v@netzero.com> writes:
> > After reading recent posts about rear stress bars, I started
> > thinking
> > (uh-oh...).
> > Does that item actually perform a useful function?  Oh, I know many
> > of you
> > report impressive handling improvements resulting from the
> > installation of
> > one, and I was seriously considering putting one in my own roc.
> > But, after
> > looking carefully at the rear suspension design, I don't believe
> > they can be
> > of much benefit.
> >   Yes, they certainly minimize the movement of the rear
> > damper/spring unit's
> > upper mounting points, but only in one plane, that plane being
> > directly
> > towards and away from each other (>< or <> aka the x-axis).  The
> > big
> > question is:  what stresses would make these two mounting points
> > move
> > together/apart?
> >    Lateral forces from cornering are completely absorbed by the rear
> > axle
> > mounts (axle-to-floorpan). No lateral stresses (x-axis) can be
> > present at
> > the top of the damper/spring units because these units are attached
> > to the
> > body and the rear axle with flexible attachments.  When the rear
> > axle moves
> > slightly sideways during cornering, the damper/spring units just
> > pivot
> > slightly in their upper and lower rubber bushings and absorb this
> > movement.
> > The bottom of the d/s unit moves in the x-axis with the axle, but it
> > pivots
> > on the mount, therefore it cannot transfer x-axis forces to the top
> > of the
> > d/s unit. (Okay, it does transfer very small amounts, because the
> > mounts
> > have some stiffness, some resistance to that flex, being made of
> > rubber or
> > polyurethane.  If the mounts were Heim joints, there would be zero
> > transfer
> > of force).
> >
> > The only significant stress on the upper mount (at any time) is in
> > the
> > z-axis; a VERTICAL direction (^), which the stress bar cannot
> > control.
> > I realize that this may unleash a flood of responses telling me how
> > wrong I
> > am, but before any of you do that, be sure you can back up your
> > postion with
> > more than "Hey, all the racers use 'em and they can't all be wrong!"
> > or "I
> > put one on my car and could really tell the difference."  Those are
> > not
> > valid, defensible engineering positions.
> >
> > Any thoughts?
> > Larry  sandiego16V
> >
> > ----- Original Message -----
> > From: <Cmr446@cs.com>
> > To: <scirocco-l@scirocco.org>
> > Sent: Saturday, June 15, 2002 12:28 AM
> > Subject: Upper stress bar questions
> >
> >
> > >   I need opinoins or reasons on which is the better design for an
> > upper
> > > stress bar;
> > > the solid type like the Eurosport, Neuspeed or ABD model, or an
> > adjustable
> > > one like the Autotech bar.
> > > Carl
> > > 77rocco
> > > 89fox
> >
> >
> >
> > _______________________________________________
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> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
> >
>
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