[alfa] Re: Duetto Vs. later Spider suspension geometry

["John Hertzman" <johnhertzman@xxxxxxxxxxxxx>]

Beatle Bayly asks about the raising of the roll-centre on the front suspension geometry when the roadsters went from the 1600 Duetto to the 1750 (roundtail), which was supposedly successful in significantly reducing the lean of the car in corners (coupled with a front anti-sway bar.)
 
This was the subject of a protracted discussion and some confusion on the digest a few years ago. The GTA front suspension geometry had been altered by the addition of a knuckle riser, and the lessons learned from the GTA experience led to a redesigned steering knuckle on the 1750  not primarily the Spider, but all three body styles. On the stock road cars this was virtually the only front suspension change, and the only one which affected suspension geometry. The roll bars stayed the same, springs and spring pans changed with body style and consequent weight, a few parts (like rubber snubbers) changed between the very earliest TI and Super berlinas and the later cars, but the steering knuckle (fuso a snodo) was the change that counted; changing it from the pre-1969 part to the post 1968 part should do the trick.
 
John H.
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