Larry,
Although I'm not an expert on 'A' type overdrives I can give you some
pointers. Overdrive pressure should be sufficient to allow the unit to
engage when full torque is being transmitted (it is this that tries to push
it out), but if it is too high then the clutch may not last long and it can
be very harsh engaging. The exception to this appears to be the 'J' type
where it is fiitted behind so many cars the pressure can vary from 350 to
over 600 without too many problems. Basically I wouldn't go much more than
the original spec unless you have a lot more torque as it will cause more
problems than it solves.
John Kipping
----- Original Message -----
From: "Larry Young" <cartravel@pobox.com>
To: <fot@autox.team.net>
Sent: Thursday, May 16, 2002 10:56 AM
Subject: Overdrive Setup for Racing
> A couple months ago, I knew nothing about overdrives, but now I'm in the
> final stages of rebuilding an overdrive for my TR3 race car. It has the
> early style large accumulator, which is supposed to give more positive
> shifting and is more desirable. My question is, what pressure to run it
> at? Higher pressure will give more positive shifting, but will be harder
> on the drivetrain. I want it to shift well, but don't want to risk a
> broken axle. I've currently got it set up to run at about 390 psi, i.e.
> slightly higher than standard specs.
>
> BTW, everyone should visit the Buckeye Triumphs website
> (www.buckeyetriumphs.org) for some great information on transmissions
> and overdrives. Nelson Reidel should be knighted for a great
> contribution to the Triumph community.
> Larry Young,
> Forever Young Racing
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