The Spitfire pushrod measurement is one clevis pin longer(5/16" or .312")
while I had it out I put the old TR6 rod back in and it is not going to be
acceptable for me, maybe if I went back to the first hole(shortened arm),
but then it would be too hard.
I like the spitfire pushrod because the pedal uses 3/4's of its travel at
disengagment and I know that I never end up bottoming the cylinder, along
with all of this I feel the pedal gets easier when it goes over center( It
feels healthy and I will measure this). it is to simple as I didn't have to
fabricate anything.
So IMHO If you are plagued with the problem you actually have four choices
(1) live with it(2) Fabricate(3)use a spitfire pushrod(4)use a larger bore
MC from the early 6's
Truely the preference that a fellow list reader might choose.
Happy Motoring everyone
Brooks
----- Original Message -----
From: "Sally or Dick Taylor" <tr6taylor@webtv.net>
To: "Brooks Bullock" <airsmyth@covad.net>
Cc: <6pack@autox.team.net>
Sent: Friday, July 27, 2001 11:46 PM
Subject: Spitfire pushrod
> Brooks---I don't know what the length difference is between the standard
> TR6 pushrod and the one that you use from the Spitfire, but the theory
> here could be correct. Obviously the clutch pedal should bottom on the
> floor pan before the MC bottoms, due to the longer pushrod. I increased
> the length of my stock pushrod by.150 to be sure all of the fluid in the
> MC is delivered to the slave. I tested by hand that the pedal bottoms
> out. I brought this up about a year ago as a way to get the pedal up
> higher, and met with mixed responses to the idea. I've used this
> slightly longer (home made) pushrod so my wife can 'take over' on some
> of the longer trips. I find my release point much higher than other TR's
> I've driven.
>
> I believe one could duplicate this "extra" amount of fluid passed along
> by installing the MC with the larger bore that came in the early TR6's.
>
> The "third hole" will give you a slight mechancal advantage in releasing
> the clutch. The trade off is that in using the bottom hole the arm can't
> rotate as far. If your clutch still releases with the lesser movement,
> then you're OK*..But then this is where it all began, isn't it?
> *OK, but your SC push rod and piston is working at an angle.
>
> My clutch pedal pressure actually gets lighter as I feel the release go
> "over center" long before the pedal bottoms. More on "pressures" later
> in another posting.
>
>
> Dick T.
> '73
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