colintvr
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| posted on 13/12/06 at 05:11 PM |
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TR6 uprights
Does anyone have any experience of lowering a car that uses the TR6 front upright? It's the bigger brother to the Herald/Spitfire type with a
similar but larger trunnion.
Specifically, since I can't move the chassis end pick-ups, I need to lower the upright's points, ie, move the top ball joint and trunnion
lug down by a similar amount. Any information on this upright would be interesting, I don't see much written about it as TR6 guys only have to
fit lowering blocks at the chassis end. Thanks, Colin.
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mookaloid
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| posted on 13/12/06 at 06:37 PM |
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I have had a couple of Scimitars which use this upright.
I guess that shorter springs would do it but you need to have a look at the geometry afterwards. you would preserve the geometry by simply moving the
wisbone mounting points up - which would have the effect of lowering the car.
I don't think there is a lot of future in trying to modify the trunnions etc
HTH
Mark
"That thing you're thinking - it wont be that."
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TL
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| posted on 14/12/06 at 01:01 PM |
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I have a Scimitar;
If you only want to lower the car by up to about an inch, you can simply invert the lower wishbones. which will lower the coil-over bottom mount. If
you want to lower by more than that, the upper & lower WB brackets all bolt to the chassis, so can be repositioned, but the top coil-over mount is
welded intergral to the chassis (at least it is on the Scimitar), so is not as easy to move.
What car will you be using this on? IMHO its a bit OTT for a 7.
Just saw your profile, so I assume it's for your TVR
[Edited on 14/12/06 by TL]
Cheers,
Terry
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TL
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| posted on 14/12/06 at 01:11 PM |
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Have a look at http://www.rimmerbros.co.uk/tr6/images/66a.gif
This shows the brackets. Interestingly, the picture shows the upper WB mount bolted to the top face of the chassis (i.e. the bracket fixing bolts
pointing downwards.)
This may or may not be correct for TR6, but on the Scimitar the brackets mount to the vertical face of the chassis leg, so the fixing bolts point left
to right.
Cheers,
Terry
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colintvr
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| posted on 14/12/06 at 02:02 PM |
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Yes it is a TVR and so moving the chassis points would be major surgery. Both the Scimitar and the TR6 use bolt on inboard pick-ups so it's no
matter moving them.
I've had some stress people look at the lower upright's stub which carries the trunnion, with a view to accessing whether it can take the
extra bending moment introduced by lowering the trunnion lug. They guessed it probably could but would need the material spec and load profile. The
trunnions that are about nowadays are so poor in manufacture I really begrudge using them.
All thoughts welcome, Colin
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britishtrident
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| posted on 15/12/06 at 09:54 AM |
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Just use smaller OD tyres.
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