On Thu, 8 Jan 1998, Brown, Jeff L wrote:

> I would disagree.  What were doing here is physically changing the pickup
> points of the suspension.  This would lower the car (theoretically) without
> changing the suspension geometry.
> Ever seen the lowering kits for trucks.  They all have shorter spindles.
> Exactly what shine Racing wants to do, except with a car.
> Someone has to be able to explain this better than me.  Please speak up.
>
> Jeff
> 97 DE
>

Okay, I'll elaborate a little further.  The roll centers, one each front
and rear, are the centers for body movement due to suspension actions
movement, sort of.  Now, modify the height of the wheel w/o affecting the
suspension.

Now, all forces can be said to act upon the cg of the car.  The roll
couple is the distance between the cg and roll centers.  This is the
lever arm that any forces on the car(cornering acceleration) use to
create body roll.  The longer the moment arm, the greater the roll
moment(torque) which creates body roll.  Body roll is, of course, bad,
and must be resisted by springs and swaybars.

Of course, as always, I know I must be wrong, so please correct me.

-Dave


> >
> > It will lower the cg significantly, but won't play havoc with the rill
> > centers like doing it with springs does.  Lowering the strut-type
> > suspension significantly makes the suspension's roll centers drop to
> > beneath ground level, which increases the roll couple, giving the car a
> > greater propensity to body roll.
> >
> > -Dave

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