The only issue I have with a J-OD that it switched off during the race.
The OD always went out and popped in a very short manner.
No idea what this could cause.
- New solenoid (it happened with the old solenoid too)
- wiring is connected well
- oil level little higher than normal
Cheers
Chris
-----Urspr|ngliche Nachricht-----
Von: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] Im
Auftrag von Catpusher@aol.com
Gesendet: Dienstag, 13. November 2012 01:29
An: fot@autox.team.net
Cc: HRPTR3@aol.com
Betreff: [Fot] Racing a TR3 A Type Overdrive
Racing a TR3 A Type Overdrive
Please see what you can find in the archives.
For many years the TR3 was one of a very few cars not allowed alternate
gearbox ratios in SCCA E Production. Using second gear overdrive was
essential with a full race motor to bridge the gap between 2nd and 3rd. I
spent thousands of hours studying and modifying the OD. Running a pressure
gauge during events is necessary, as is not allowing it to leak on the
driver. The gauge will show when the solenoid is out of adjustment, and
most critically, when there is a running pressure drop. If the accumulator
piston does not reach the blow off holes, that oil no longer gets to
several parts. The specks for the accumulator bore are very tight, and
honing to remove the steel piston ring scratches will only work a few times.
The TR4A IRS/TR6 piston, sleeve, and spring provide a much lower volume and
pressure, but a replaceable sleeve is a good idea. Much research about
piston displacement and pressure pointed me towards a Jaguar sedan assembly
that was NLS, but JRT, with the help of a UK Jaguar club, provided a few
sets of piston and sleeves, and I also located the matching springs. I did
find it necessary to run an oil cooling system with an electric pump and
MGC auto gearbox cooler, all set low enough that it would not flow back into
the gearbox during the early laps before the pump was turned on. Keep in
mind that I was running slicks and often ran where the track temps were
high.
TR Regards, Hardy
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