[Vintage-race] Formula 4 spring rate question

[roger Sieling]

Walt,

Some where in my lit collection, I have an advertisement flyer for a Johnny
Walker, balsa/ aluminum composite F4 car. Seems I remember it to have had
rubber springs. I'll see if I can find the page. Originally they had Triumph
and Norton double knockers. I've never seen one of these cars in person, but
i do remember the Canadians coming down to Nelson Ledges w/ home built F4
750 cars and they looked a blast.

Roger

On Mon, Feb 23, 2009 at 1:56 PM, <WSuman at aol.com> wrote:

> I'm resurrecting a 60's Johnny Walker Formula 4 from a basket of  parts.
> Included springs are 150#, 250#, 310#, 350# and 480#.
>
> Among other issues, I have spring questions.
>
> I need to get some new springs (at least fronts) and am trying to make  an
> educated decision.  Weight is ~600#, distributed aft but I don't  know %
> yet.
> Motor currently is Honda CB-750, no ides what else may  have been in there.
> Sanctioned as 3/4 liter from virtually any  source.
>
> Current front sets are 2.25" x 7.5" and I need to go shorter by  1-1.5" for
> clearances.  Rears are also 7.5" but bottom end is 2"  id. (threaded perch
> is
> pressed steel).
>
> If anyone could direct me to a source of information on choosing spring
> rates, and a source for springs, I would be most appreciative.
>
> Regards,
>
> Walt Suman
> Seattle
>
>
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