Hi,

I,m just about to start knocking up my chassis et al, For the front wishbones the road end is always tied solidly, ie track rod ends ball joints etc. Looking at various pictures it appears that most cars have bushes at both ends of the wishbones on the rear.

So my question is simple, is it worth going to the effort of rose jointing the road end of the lower wishbone on the rear or just use bushes. I am going to copy the front, a Y shaped wishbone with track rod ends at the top so I can adjust camber (most cars I have had always had solid bushes or needle bearings on the outside).

The cars going to be blade engined for track day fun & road.

In theory, Mark, rose joints offer more control since the arms pivot around fixed points. Bushes are designed to absorb high frequency vibration that canīt be dealt with by the spring and dampers, so itīs basically aimed at ride comfort. It is all about compromise, as is everything in a car. But since you already use rose joints up front...

I,m not using rose joints up front as I will use bushes on the chassis end, the standard design utilises solid style mountings at the road end.

I,m just wondering what the effect of rubber bushes at both ends have, in theory twice the flex but will I notice it ?

you might notice it only if racing hard, on the other end, if you use rose joints all around you will certainly feel every small bump on the road... In my case, since I am building my own version of the locost in Brazil (chevette donor, no sierras were ever sold here), and I want it to be a daily driver, Iīm going for rubber bushes all around. Again, itīs all a matter of compromise.

I've gone for rose joints on the inboard end and bushes outboard on my IRS, I wanted to have a degree of adjustability and that seemed a good way of getting it.

Mick

I've done the same as "mix" and for the same reason.
Bob

I'm with you two, just the other way round.

Poly bushes inboard, rose joints on the upright.

Paul G