mark chandler
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| posted on 23/9/05 at 12:24 PM |
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IRS wishbone bushes
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.
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gustavo_brum
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| posted on 23/9/05 at 12:32 PM |
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In theory, Mark, rose joints offer more control since the arms pivot around fixed points. Bushes are designed to absorb high frequency vibration that
can´t be dealt with by the spring and dampers, so it´s 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...
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mark chandler
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| posted on 23/9/05 at 12:46 PM |
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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 ?
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gustavo_brum
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| posted on 23/9/05 at 02:29 PM |
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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, I´m going for rubber bushes all around. Again, it´s all a matter of compromise.
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Mix
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| posted on 24/9/05 at 09:59 AM |
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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
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Bob C
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| posted on 24/9/05 at 06:34 PM |
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I've done the same as "mix" and for the same reason.
Bob
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907
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| posted on 24/9/05 at 08:27 PM |
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I'm with you two, just the other way round.
Poly bushes inboard, rose joints on the upright.
Paul G
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