VinceGledhill
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| posted on 30/12/16 at 07:23 PM |
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MGF Hubs offset - What effect will it have?
Hello People.
Please can you help? I'm currently building an ariel atom type vehicle and have chosen an MGF as the donor.
Just looking at the rear hub, and thinking about my wishbones earlier today, as you can see from the image of one that is on e-bay (can't load
them from my phone it's taking an age to e-mail to myself)
One mounting is higher than the other. Surely if I connect the ends of my wishbone to this, then it is going to have a detrimental effect to the
geometry.
Any idea how to correct it?
[Edited on 30/12/16 by VinceGledhill]
[Edited on 30/12/16 by VinceGledhill]
Regards
Vince Gledhill
Time Served Auto Electrician
Lucas Leeds 1979-1983
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cliftyhanger
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| posted on 30/12/16 at 08:25 PM |
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You are discovering why I gave up trying to fit one to the rear of my spitfire! (got the Triumph uprights machined out to take the MGF bearing/hubs
etc)
One option is the rover100 front upright.....
Or get one hole welded up and redrilled. Or tap it and wind in a threaded bit of (quality) stud, and redrill.
I have seen "uneven"wishbone used on one of these (a racing Triumph vitesse) and the owner reckons it is fine, but even though I
can't explain why it is wrong, it looks wrong to me. And that is enough for me!
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jambojeef
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| posted on 30/12/16 at 09:40 PM |
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A quick google of anti dive / anti squat geometry should help 
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rdodger
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| posted on 31/12/16 at 08:44 AM |
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Check out MG TF rear uprights. They are a little different and may be level.
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MikeRJ
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| posted on 1/1/17 at 10:59 AM |
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The uprights are intended to be used with a wishbone attached to just one of the lower mounting points, and then a second linkage attaches the other
point to the chassis (or subframe in the MGF's case) to provide toe adjustment. You could replicate this set-up, though care would need to be
taken that you don't introduce any toe-out when the suspension is compressed, unless you like evil handling cars.
If you want to attach a single wishbone to both lower point, the inboard mounting points would need to be staggered in the same way i.e. you
couldn't make a 'twisted' wishbone to align everything as it would bind up as soon as the suspension moved i.e. all pivot points
must be in the same plane. If you can arrange the chassic mounting points so a line drawn through them points upward towards, but below the cars
centre of gravtity, then you will have designed in some anti-squat behaviour. This is not always desirable however, so best to do some research on
this.
[Edited on 1/1/17 by MikeRJ]
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VinceGledhill
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| posted on 2/1/17 at 10:05 AM |
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quote:
Originally posted by MikeRJ
The uprights are intended to be used with a wishbone attached to just one of the lower mounting points, and then a second linkage attaches the other
point to the chassis (or subframe in the MGF's case) to provide toe adjustment. You could replicate this set-up, though care would need to be
taken that you don't introduce any toe-out when the suspension is compressed, unless you like evil handling cars.
If you want to attach a single wishbone to both lower point, the inboard mounting points would need to be staggered in the same way i.e. you
couldn't make a 'twisted' wishbone to align everything as it would bind up as soon as the suspension moved i.e. all pivot points
must be in the same plane. If you can arrange the chassic mounting points so a line drawn through them points upward towards, but below the cars
centre of gravtity, then you will have designed in some anti-squat behaviour. This is not always desirable however, so best to do some research on
this.
[Edited on 1/1/17 by MikeRJ]
Thanks, I think I'll try to look at mounting the chassis points on the lower arms to match that of the uprights.
I can certainly "tack weld" it all in place, and play about with it to monitor the results.
Regards
Vince Gledhill
Time Served Auto Electrician
Lucas Leeds 1979-1983
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dai1983
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| posted on 12/4/17 at 10:12 AM |
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How did you get on with this after as I'm looking at the F as a single donor and seen the same issue?
The front uprights are different to the rear so two sets could be used. What rears do Sylva use on their J17?
Another thought I've had is designing a de dion set up using the rears as they are.
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