Nice idea - really!
I use Overdrive springs for the Weber mounting.
Take one of the OD springs and cut them into pieces...never failed 'till now.
Knock on wood.
Chris (TR4 #74)
----- Original Message -----
From: "Chris Kantarjiev" <cak@dimebank.com>
To: <fot@autox.team.net>
Sent: Monday, August 07, 2006 5:14 PM
Subject: RE: [FOT] Fuel Pressures
> Long ago, when I was devouring everything I could about race car prep,
> I ran across a passage in the Dave Bean Engineering catalog about
> mounting DCOEs on four cylinder engines. It ran something like this ...
> no, exactly like this, since I still have that very useful catalog
> on my shelf:
>
> ---
>
> Although there is little to choose between the performance of
> thackeray wahser and rubber cushion grommets, each has its own
> durability problem.
>
> Thackeray washers experience metal fatigue, as any spring will, and
> break, thus collapsing and reducing o-ring compression. The culprit,
> of course, is high frequence engine vibration. 7,000 rpm seems to
> be the magic number. Above that, 20 to 50 hours of running is about
> all you can expect of the upper thackerays (which are the ones that
> fail; the lower ones have little load on them and live forever).
>
> The cushion grommets don't have this problem, but do have one of
> their own. The inevitable fuel leakage out of the carb-manifold
> joint will eventually attack and rot the lower grommet. The upper
> ones, of course, have little fuel contact and last forever.
>
> VOILA! Use thackerays on the bottom and grommets on the top for
> optimum soft mount life. Simply purchase an extra pair of cushion
> grommets and washer for each soft mount kit you buy. Then keep the
> leftover pair of thackerays in your toolbox as spares. Sometimes
> the obvious escapes us.
>
>
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