RE: roll centers

["Steve Moresi" <smoresi@domain.elided>]

%
%yes, but with our cars (115 series Alfas) wouldn't the opposite be
%true?  it is
%accepted that the rear roll center on these cars is very high (top of the
%diff), while the front r/c is quite low (in stock suspension
%configuration).
%as such, the roll axis is tilted sharply upward from front to rear.  to
%alleviate this and level the roll axis out, one can lower the rear
%roll center
%by means of a panhard rod or sliding block, but could one not also
%RAISE the
%front r/c to further contribute towards leveling the roll axis?
%
%if this is correct so far, then wouldn't the tilted lower A arms raise the
%front r/c and thereby achieve better suspension geometry by
%correcting, to some
%degree, the disparity in front to rear r/c heights?

Well I think now we have to look at the height of the CG in relation to the
roll center axis.  Would raising the front roll center bring the axis closer
to, or farther from, the CG.  By raising the front roll center, one might
induce even more body roll.

Does anyone know the CG heights on any of these cars?  If not, I may find
some time to calculate it, at least for my spider.  The SAE club here at
school has some corner-weight scales. Oh yeah, how about front suspension
geometries...

Steve
SLO, CA
74 Spider
64 Spider

--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided