[Fot] Springs

[tedtsimx at bright.net]

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 at isis.mit.edu>
> Date: Thu Jan 31, 5:44 PM
> To: William G Rosenbach <wgrosenbach at juno.com>
> CC: fot at autox.team.net,  awashatko at 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
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