lsdweb
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| posted on 13/1/08 at 07:55 PM |
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Using Single Seater uprights on a '7'
Hi All
Has anybody used single seater uprights on their build?
I'm just starting another build and I'm thinking of uisng Swift single
seater uprights at the front and, possibly the rear if I go IRS. I picked up a ful set of uprights from a Formula Renault as spares for my single
seater but it seems daft not to use them. They feel less than half the weight of the Cortina front end!
I can get calipers easily and it won't be roadgoing so a handbrake is not needed.
The PCD is quite small (around 95mm) but I could easily convert the hubs to take centre lock wheels ( I have 8 split rims).
Any thoughts?
Fronts...
 
Rescued attachment uprights.jpg
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lsdweb
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| posted on 13/1/08 at 08:08 PM |
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Rears
 
Rescued attachment rear uprights.jpg
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lsdweb
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| posted on 13/1/08 at 08:11 PM |
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More rears
 
Rescued attachment SNV30430.JPG
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zilspeed
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| posted on 13/1/08 at 09:19 PM |
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Any thought ?
I would certainly prefer something pucka like that - as would most people I reckon.
Are these cast aluminium ? i.e. not magnesium ?
If they are, it's an obvious yes IMHO.
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lsdweb
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| posted on 13/1/08 at 11:04 PM |
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Hi zilspeed
I think they are cast aluminium. I had to helicoil the caliper bolt holes on my single seater but that's not exactly a huge issue and
won't take me long! I haven't decided on whether to go DeDion or IRS yet - I'll use the rears as well if I go IRS, although the
weight saving of DeDIon appeals!
Wyn
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blue2cv
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| posted on 13/1/08 at 11:05 PM |
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I've got some unmachined magnesium rears going spare
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MikeRJ
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| posted on 14/1/08 at 11:02 AM |
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On the front uprights, the bottom fixing is obviously for a rose joint, but how does the upper attach to the wishbone and provide steering
articulation? Another rose joint used "sideways"?
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lsdweb
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| posted on 14/1/08 at 04:55 PM |
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MikeRJ
You are right - the top uses a rose joint in the vertical plane - there's a rod / bolt running through the gap and this has spacers on it to
hold the rose joint in the correct position - these uprights are identical to the ones on my single seater so I'll take a picture which should
explain it more easily!
Wyn
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lsdweb
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| posted on 14/1/08 at 08:13 PM |
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Like this
 
Rescued attachment SNV30449.JPG
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MikeRJ
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| posted on 15/1/08 at 10:39 AM |
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Right, I guess it has rocker arm suspension, so the spherical joint needs to be in that orientation to take the suspension loads? Do you have the
upper arm to go with the uprights or will you be fabricating that yourself?
[Edited on 15/1/08 by MikeRJ]
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lsdweb
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| posted on 15/1/08 at 01:22 PM |
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Yes - the single seater has rockers and inboard dampers but we'll just use 'normal' wishbones on the '7' with a rose
joint threaded into the end of it.
Wyn
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lsdweb
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| posted on 15/1/08 at 10:52 PM |
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I've just weighed the Cortina uprights and the single seater ones -
Cortina with disc and caliper - 15kg
Single seater with disc and caliper - 8.5kg.
Easy decision to make I think!
Wyn
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MikeRJ
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| posted on 15/1/08 at 11:11 PM |
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quote:
Originally posted by lsdweb
Yes - the single seater has rockers and inboard dampers but we'll just use 'normal' wishbones on the '7' with a rose
joint threaded into the end of it.
Wyn
If the shock is mounted onto the lower wishbone won't you be putting all the suspension loads the "wrong way" through the lower rod
end?
[Edited on 15/1/08 by MikeRJ]
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lsdweb
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| posted on 16/1/08 at 12:45 PM |
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quote:
If the shock is mounted onto the lower wishbone won't you be putting all the suspension loads the "wrong way" through the lower rod
end?
Mike
I see what you're saying. I haven't researched this much yet but I'd have thought that no matter which orientation the bottom rod
end is in, it will always be subjected to load - either suspension or longitudinal (braking) in the 'wrong' plane.
Please feel free to correct me!
Wyn
[Edited on 16/1/08 by lsdweb]
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