whitestu
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| posted on 21/4/10 at 12:24 PM |
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Indy Castor Again
I've finally got round to measuring the castor on my car and it is around 3 degrees on the drivers side and 4 on the passenger.
I'd like to correct this, so I have 6 degrees both sides, and so get a bit more self centreing.
So I can either modify / make new wishbones or grind off the chassis brackets for the top bones and weld some new ones on in the right place.
It seems to me that moving the chassis brackets is easier.
Anyone done anything like this already?
Thanks
Stu
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gingerprince
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| posted on 21/4/10 at 12:25 PM |
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Someone on here (can't remember who, sorry) makes/made some upper wishbones for the indy that were rose-jointed, meaning that the fore-aft
position of the wishbone could be changed by padding with spacers.
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whitestu
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| posted on 21/4/10 at 12:31 PM |
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quote:
Someone on here (can't remember who, sorry) makes/made some upper wishbones for the indy that were rose-jointed, meaning that the fore-aft
position of the wishbone could be changed by padding with spacers.
I know I bought some, and never received them!
Looking to do it myself now.
Stu
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gingerprince
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| posted on 21/4/10 at 12:33 PM |
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Ah, sorry!
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whitestu
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| posted on 21/4/10 at 01:54 PM |
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Now I'm looking at the car it's clear that the brackets can't be moved so it looks like modified bones are the only solution.
Has anyone modicied their own Indy bones for more castor?
Stu
[Edited on 21/4/10 by whitestu]
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matt_claydon
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| posted on 21/4/10 at 04:04 PM |
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I'm lucky to have a set of the rose jointed ones, but before they appeared on the scene I thought it may work to just reduce the length of the
tubes that take the polybushes and mount the wishbones at the rear of the chassis brackets, with washers in front as packing.
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Guinness
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| posted on 21/4/10 at 05:36 PM |
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Does anyone have a CAD drawing of what is required for a replacement top bone?
Thought I might ask one of our fabricators if he could knock up a set.
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Frosty
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| posted on 21/4/10 at 05:40 PM |
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The rose-jointed wishbones are a great idea, but the problem is the rose joints, which just won't last in the road, and most Indys will do at
least some road miles even if they are mostly used on track.
The spacing of the wishbones is a brilliant way of correcting one of the inherent flaws in the Indy though.
Reducing the bush housing length would work, but I think accuracy would be difficult to achieve.
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Frosty
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| posted on 21/4/10 at 05:45 PM |
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quote:
Originally posted by Guinness
Does anyone have a CAD drawing of what is required for a replacement top bone?
Thought I might ask one of our fabricators if he could knock up a set.
It's not really the top wishbone, it's the mounting bracket itself. These seem to be located slightly differently on a lot of cars, so
some level of adjustment is what's required to even up caster on both sides.
What would work well to allow castor correction is two top wishbones the same as what is supplied with the kit, but the bush housing should be shorter
to allow it to be spaced slightly forwards or backwards.
This would retain road compliance, and allow slight adjustment too.
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Hellfire
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| posted on 21/4/10 at 06:00 PM |
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Give MK a call, I'm sure they could fabricate and supply you with rose-jointed top wishbones for the Indy.
We modified a pair of Indy wishbones to accept a camber adjuster and rose-joints.
Phil
[img][/img]
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whitestu
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| posted on 21/4/10 at 07:58 PM |
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Thanks Guys - some good ideas there.
Phil, what castor angle do you have now with the modified bones?
Thanks
Stu
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Steve Hignett
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| posted on 21/4/10 at 08:20 PM |
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U2U sent...
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Hellfire
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| posted on 22/4/10 at 11:21 AM |
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Currently running at 6 degrees IIRC
Phil
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whitestu
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| posted on 23/4/10 at 07:41 AM |
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I've ordered some rose joints so I'll have a go at modifying the bones when I get some time.
Thanks for all the advice.
Stu
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