With my TR6 there is still a bit of run on even with the valve. It doesn't
seem
to be the end of the world to kill it with a combination of clutch
out brake
in. Jim
________________________________
From: Larry Young
<cartravel@pobox.com>
To: FOT@autox.team.net
Sent: Mon, August 6, 2012 5:13:08
PM
Subject: [Fot] Anti Runon Valve ADU9535
This question is not of interest
to racers, but my street TR250 has had a
problem with run-on or dieseling
since leaded premium went away back in the
1980s. This has continued through
several carb rebuilds, many ignition
configuration changes and recently an
engine rebuild. During recent rebuild, I
tried to remove any sharp areas
that might create hot spots and of course all
the carbon has been removed,
but the problem still persists. There is
additional tuning I should and will
do such as carb rebuilds, carb needles,
timing advance curves, etc., but I
suspect this problem will continue. The
solution for later Triumphs and
other British cars was the anti run-on valve.
It appears that the simplest
retrofit would be to install a Rover/MG ADU9535
valve. Basically, the valve
opens when the ignition is turned off and floods
the manifold with air making
the mixture too weak to support combustion. Where
do I find one of these
valves? They do not appear to be available except on
ebay.uk.
Larry
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