[Fot] TR3 rear shock conversion

[Bill Babcock]

What's a KIC?

On Jun 24, 2010, at 7:37 PM, Tony and Annie Garmey wrote:

> To Answer Bills Question, I do get improvement out of Lever Shocks. The
Biggest thing in using the Dyno is making sure that one matches the
other...and also in some cases moving the arms on the pivot shaft because the
car has been lowered so that the  pistons do not
> bottom out.
>
> Who's racing at the KIC ?? I'll be racing there in  something other than a
TR (sorry !)
>
>
> > From: billb at bnj.com
> > Date: Thu, 24 Jun 2010 15:21:56 -0700
> > To: tr3driver at ca.rr.com
> > CC: fot at autox.team.net
> > Subject: Re: [Fot] TR3 rear shock conversion
> >
> > It almost certainly will solve that problem, which leaves all the rest. I
> > think the biggest problem is structural--the damping has to happen over a
very
> > short stroke. The lever greatly amplifies the distance to give adequate
> > travel, but that means the damping has to be much stronger to give a
similar
> > damping force, and occurs over a small stroke. I think the stroke is
important
> > because of the time required for the valving to respond and how fast the
fluid
> > has to move.
> >
> > That's all just theory, the bottom line is that when you put an armstrong
on a
> > shock dyno it looks horrible. A classic shock damping profile looks like a
D
> > laying on it's back. An armstrong profile looks more like a seismograph
during
> > an earthquake. I know Tony Garmey and Jeff Quick fiddled with armstrongs
on
> > Tony's shock dyno. I don't know if they ever got any improvement. I didn't
see
> > their work, I put all of mine on a shock dyno here in Portland, hoping to
> > match them up and play with the valving. The guy who ran their dyno
thought
> > they were broken. They weren't.
> >
> > On Jun 24, 2010, at 2:29 PM, Randall wrote:
> >
> > >> The lever shock can
> > >> "foam" the fluid so the damping effect is lost since the shock fluid
is
> > >> now foam rather than pure fluid.
> > >
> > > Seems to me that it would be pretty trivial to fix that, if it is really
a
> > > problem. The solution is the same as implemented in (some) tube shocks;
> > add
> > > a divider between the fluid and the expansion (air) space, so there is
no
> > > way for the fluid to get mixed with air (aka foam).
> > >
> > > For lever shocks, I'm thinking of an external canister with a bladder
in
> > it,
> > > somewhat similar to an Accusump (but much smaller of course). Tap the
top
> > > cover of the lever shock for a fitting, run a line to the canister
mounted
> > > on a frame rail. Since relatively little pressure is involved (just
> > > whatever is generated as the shock heats up and forces oil into the
> > > canister), the plumbing should be easy. Hardest part is probably
filling
> > > and bleeding the air out of the hydraulic side.
> > >
> > > Even some tube shocks use this setup:
> > > http://www.shockabsorbersworld.com/shocks-reservoirs.html
> > >
> > > -- Randall
> > > _______________________________________________
> > > fot at autox.team.net
> > >
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