when i saw the OE bushes come off my car i was horrified. Fair enough they had properly been on the car for 50k miles but even so, they were rubbish.
i disagree that thousands of hours had been spent designing that bush. its a off the shelf item fitted to lots of cars and just doesn't work on the 159 family for some reason.
the poly bush is a much better engineering solution in my opinion
Oh dear, do we have to sail so close to the wind on issues such as this. No where have I stated that Poly-bushes are inferior to standard, just in the hands of an expert driver (factory test driver), the margins between them would not be as great as those poly-bush devotees seem to be implying. What I am convinced of is, these bushes do put additional lateral stresses on the mechanicals. Old Engineer is absolutely right about rubber bush design characteristics and unless one can do the maths, it is unfair to question his assertion. They are expensive to design, but CAD modelling has brought the cost down. Had Alfa Romeo fitted solid bushes in the first place, I suspect, when they rolled out the 156 there would have been more than just warranty replacement of the transverse arms to deal with. Anecdotal evidence of exploding Diffs, which have not been properly investigated as yet suggest, Alfa would not be replaced under warranty, had vehicles been fitted with non standard suspension parts. From that, one can conclude there is an element of doubt as to what extra stresses hard suspension bushes do to the mechanicals. For me there is no doubt. One could easily do modelling on this issue, but that probably would not suffice for some people. Who will tell the emperor "he has no clothes". Defending ones position, just because one has gone down a certain path, does nothing to convince anyone, when there is so much quite basic engineering evidence to the contrary.
Yes, I would be happy with Poly-bushes on any track day car I owned and there were nice grassy areas to run of on. But on the car that I depend upon for my day to day life, on British roads, no; definitely not. Yes I accept they drive and feel different and yes I accept there probably is a "more connected feel between the driver and the road". But, everything in life is a compromise. and for me standard bushes are a fair price to pay for protecting that Busso Jewel, the 3.2Q4, likewise and my little dog eared GT. If, contrary to basic engineering principals, Poly-bushes, were not, as in my opinion, detrimental to Alfa mechanicals, I would probably fit them. But someone has to do a proper engineering exercise, with thorough stress analysis before I will be convinced. But I doubt anyone would want to do that. Because, like Old Engineer, I already know the answer.
Be nice to each other. It's a great debate about issues, not personalities.