I wouldn't think this is an unsafe thing to do.
Many racers in the UK modify the vertical link by drilling holes or a series
of holes. I also have seen some plans that cut the top portion of the
vertical link and replace it with a rose joing to adjust it. I think it came
from the Jon Wolfe book.
The only geometry of the suspension that it really changes is the angle of
half shaft...and that changes in exactly the same way if you added a block
under the spring. Remember this is a swing spring so the upper control
element is nothing more than a spring mount...it won't change how the
suspension works or affect geometry through the travel of the suspension. I
don't even think it changes how the forces act from the spring to the vertical
link as those are probably 90% vertical.
aaron
aaron
> I think it would have been safer to put a spacer under the spring?
>
> A.
>
> on 4/30/05 1:12 AM, Joe Curry at spitlist@cox.net wrote:
>
> > Larry,
> > I understand your motivation in redrilling the uprights, but I have to
> > say I would never even consider doing that. It changes the geometry of
> > the rear suspension because it moves the upper control element (the
> > spring) closer to the lower control element (the axle). Without doing
> > any calculations, I am thinking that can't be good.
> >
> > Joe
> >
> > -----Original Message-----
> > From: spitfires-owner@autox.team.net
> > [mailto:spitfires-owner@autox.team.net] On Behalf Of Larry Vaughan
> > Sent: Friday, April 29, 2005 9:01 PM
> > To: spitfires@autox.team.net
> > Subject: redrilled rear vertical links
> >
> > I had a machine shop redrill my rear vertical links. One inch lower than
> > the
> > original. They charged me 60 bucks, which is less than dearching the
> > spring,
> > around here anyway. They made sure to have the new holes parallel and
> > welded
> > grade eight washers on the new holes.
> >
> > I think it may be too low now. Here are some pics.
> >
> > http://ljvaughan.homestead.com/lowerrear.html
> >
> > Larry
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