Bob, right you are. Std "size" for coil overs is 2.5". TR3 - 6 coils are 4".
Hyper coil and all the othe mfg's cannot go to a magic box and come up with any
"inexpensive" spring unless it is a commonly used size. We have abouyt 1000
springs a year madae for us. Dpoing custom springs is not cheap. Especially
if you need the spring mfg. to do all the engineering - load, coil bind, coil
defelection, how accurate do you want variation (our springs are+=/- 2%) etc.
UK springs can vary as mcuh as 10%. Ted
>
> From: Robert Lang <lang@isis.mit.edu>
> Date: Thu Jan 31, 5:44 PM
> To: William G Rosenbach <wgrosenbach@juno.com>
> CC: fot@autox.team.net, awashatko@wi.rr.com
> Subject: Re: [Fot] Springs
>
> On Thu, 31 Jan 2008, William G Rosenbach wrote:
>
> > It has been a while, but as I recall, HyperCoil would wind anything
> > custom. I don't remember anything about it being costly. They had a very
> > comprehensive line in stock.
> > A coil springs character is a straight forward mathematical formula. What
> > would make development costs so high? A complex multi-rate,
> > multi-diameter winding?
>
> I think the "issue" with regard to springs that fit Triumphs is that
> Triumph used an ID that is somewhat unique.
>
> If you "convert" to a stock diameter spring (like 2.5"), then changing
> springs is a piece of cake (and almost cheap). 2.5" is good because a lot
> of coil-over threaded bodies are 2.5". Please note that I'm not suggesting
> that you convert to coil overs, although I'm sure there are those on the
> list that have. But changing the spring perches to 2.5" ID springs really
> changes what options you have for spring rates.
>
> regards,
> rml
> ---------------------------------------------------------------------------
> Bob Lang NER/SCCA | This space for rent
> Solo Chair 2008 TR6 40 F Prepared | Triumph!
> Voice:781-438-2568 FAX: 617-258-9535 | Cell: 339-927-4489
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