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AVO Shockers
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Dave-M
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Joined: 20 Jan 2006
Posts: 377
Location: Yorkshire, England

PostPosted: Wed Oct 08, 2008 3:24 pm    Post subject: Reply with quote

Rodsmith wrote:


The other problem that I have is the front tries to dart to the left and right at speed, 65mph or so. The suspension/steering is all new, and is not binding. It may just need the tracking fine-tuning, or is it something to do with spacers on the front hubs?? Or, as was suggested to me, is the front trying to lift off the road?

Rod

I don't think the front end is lifting at that speed and I suggest you look at the rear axle location for the problem.
Panhard rod bushes at the body end of the rod would be first, then all the other bushes locating the back axle. Let us know what you find.
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Dave
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calex_fr
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PostPosted: Wed Oct 08, 2008 3:29 pm    Post subject: Reply with quote

Dave, have you find good springs ?
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Alexandre Contat

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Rodsmith
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Location: Pembrokeshire, West Wales

PostPosted: Wed Oct 08, 2008 3:32 pm    Post subject: Reply with quote

All the axle bushes are brand new, except for the top torque arm ones. I have these bushes but haven't put them on yet. I can not seem to get any movement by trying to "shake" it. It seems strange to only have one arm, but the Turner has the same, but two for the sports model!

I will try altering the tracking to see if it makes a difference, although the tyres seem true, albeit my mileage hasn't been much.

Rod
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Dave-M
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PostPosted: Wed Oct 08, 2008 3:40 pm    Post subject: Reply with quote

calex_fr wrote:
Dave, have you find good springs ?


Alex, if you look at the beginning of this post you will see what I think may be OK but at this moment I have some serious issues with the AVO dampers and need a couple more people to let me have the dimensions I asked for in the Front suspension post.
Regards
Dave
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calex_fr
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PostPosted: Thu Oct 09, 2008 7:15 am    Post subject: Reply with quote

Yes, I must translate it with precision Wink Embarassed
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Alexandre Contat

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calex_fr
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PostPosted: Thu Oct 09, 2008 7:49 am    Post subject: Reply with quote

Dave-M wrote:
Ok, No takers.
Since I asked the above question I have been doing a little research and come up with the following. This is all based on using ROC supplied AVO dampers.

For a firm sporty ride with the accent on performance:
Front springs 110 lb/in rate and free length of 10 in
Rear springs 150 lb/in rate and free length of 10 in


Ok, if I understand, + your link to http://www.rallydesign.co.uk and ROC article :
For a firm sporty ride with the accent on performance:
Front springs 110 lb/in rate and free length of 10 in
Rear springs 150 lb/in rate and free length of 10 in

Dave-M wrote:
The front suspension will have The following travel at the wheel
Front Total travel :- 4.2 in (2.7 bump & 1.5 rebound)
Rear suspension travel:- 5.6 ( 3.5 bump & 2.1 rebound)

The above information is derived from Alan Staniforths Race and Rally car source book.
I knocked up a spreadsheet to make things easier and quicker for me.
The calculations are based on the natural frequency of the suspension which is the common parameter between all suspension systems and lets you compare different cars easily to determine the ride quality you can expect. It does not determine the handling characteristics, just the correct spring selection and suspension travel.
Information used in the calculations is as follows:-
Corner weight, unsprung weight, suspension leverage, spring fitted length at normal ride height and damper travel available.
I am sure there are many knowlegable people out there, Keith Hamer and Alan Farrer being two names that spring to mind, And I would be grateful for your observations on the above as I am just about to assemble my suspension and would like it as near to right as I can get it.
Regards
Dave-M


That is too technical for me, I have lot of difficulties to translate it.
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zefarelly
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Joined: 26 Nov 2007
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PostPosted: Mon Oct 13, 2008 8:49 am    Post subject: Reply with quote

Having read all this, I'm feeling inclined to make new trailing arms 20 times simpler than the originals and use rose jointed spring/damper units

with judicious use of a few additionasl rose joints it would all be adjustable as well
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calex_fr
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PostPosted: Mon Oct 13, 2008 8:58 am    Post subject: Reply with quote

Yes, can you explain it, because for me (french) what is "rose jointed spring" ?
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Alexandre Contat

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Dave-M
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PostPosted: Mon Oct 13, 2008 9:20 am    Post subject: Reply with quote

calex_fr wrote:
Yes, can you explain it, because for me (french) what is "rose jointed spring" ?


Alex the drawing you posted ot the 500lb/in sprung spitfire, it's the bottom damper shown in the drawing

It is a "spring and damper" assembly with a Rose joint for the top mount.
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Dave
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Rodsmith
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PostPosted: Mon Oct 13, 2008 9:23 am    Post subject: Reply with quote

http://www.rallydesign.co.uk/index.php?cPath=1113_1114

Alex, If the link works- a rose joint
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calex_fr
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PostPosted: Mon Oct 13, 2008 9:25 am    Post subject: Reply with quote

OK, Uniball rose joint, patella in french (rotule).
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Alexandre Contat

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calex_fr
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PostPosted: Wed Oct 15, 2008 9:12 am    Post subject: Reply with quote

I find AVO Spitfire pics, alone and in the car. They seem different of ROC AVO :









And they seem to have no problem.
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calex_fr
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PostPosted: Wed Oct 15, 2008 9:39 am    Post subject: Reply with quote

GT6 source : http://gt6-doz.blogspot.com/2008/03/new-shocks-go-on.html

AVO ref is PB796
Quote:
NB ON PB796 UNITS, CUSTOMER MUST SPECIFY IF THEY WANT 2.25 I/D OR 2.5 I/D SPRING SEATS

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Alexandre Contat

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Dave-M
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PostPosted: Wed Oct 15, 2008 10:20 am    Post subject: Reply with quote

Alex, The Triumph units are mounted at a different angle to the Rochdale so they may not be suitable.
I don't suppose you have found a drawing of the Triumph suspension like the Turner one or the Lotus one at the beginning of the other AVO post.
It would be very useful and we can then get a correct specification for the shockers.
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Dave
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Dave-M
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PostPosted: Wed Oct 22, 2008 11:41 am    Post subject: Reply with quote

calex_fr wrote:
Dave-M wrote:
quote="Dave-M"]The front suspension will have The following travel at the wheel
Front Total travel :- 4.2 in (2.7 bump & 1.5 rebound)
Rear suspension travel:- 5.6 ( 3.5 bump & 2.1 rebound)

The above information is derived from Alan Staniforths Race and Rally car source book.
I knocked up a spreadsheet to make things easier and quicker for me.
The calculations are based on the natural frequency of the suspension which is the common parameter between all suspension systems and lets you compare different cars easily to determine the ride quality you can expect. It does not determine the handling characteristics, just the correct spring selection and suspension travel.
Information used in the calculations is as follows:-
Corner weight, unsprung weight, suspension leverage, spring fitted length at normal ride height and damper travel available.
I am sure there are many knowlegable people out there, Keith Hamer and Alan Farrer being two names that spring to mind, And I would be grateful for your observations on the above as I am just about to assemble my suspension and would like it as near to right as I can get it.
Regards
Dave-M


That is too technical for me, I have lot of difficulties to translate it.


While we are all trying to write in French I wondered if this was any good for you Alex.:-

Les informations ci-dessus est tirée d'Alan Staniforths course de rallye et de source livre.
J'ai frappé d'une feuille de calcul pour rendre les choses plus facile et plus rapide pour moi.
Les calculs sont basés sur la fréquence de la suspension qui est le paramètre commun entre tous les systèmes de suspension et vous permet de comparer les différents véhicules afin de déterminer facilement la qualité de roulement, vous pouvez vous attendre. Il ne détermine pas les caractéristiques de manipulation, juste la bonne sélection de printemps et de la suspension Voyage.
Les informations utilisées dans les calculs est la suivante: --
Corner poids, masse non suspendue, la suspension de levier, équipé de printemps longueur normale à la hauteur et l'amortisseur de Voyage disponibles.
Je suis certain que de nombreux knowlegable gens là-bas, Keith Hamer Farrer et Alan sont deux noms qui viennent à l'esprit, et je serais reconnaissant de vos observations sur ce qui précède que je suis sur le point de monter ma suspension et il voudrait que près de à droite comme je peux l'obtenir.
Observe
Dave-M
If you can undertand it let me know and I can tell you how I did it.
Regards
Dave
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