George, most people I know with the Pertronix conversion keep a set of points
etc in the trunk as the electronic units have been known to fail.
Re poor idling and running when hot, there was a very nice post to this list a
short time ago from Vance where he described the symptoms and the correction
of the Stromberg temp compensators that will make the motor run rich when
warmed up if they are not working correctly. That might be another avenue to
pursue.
Stan
-----Original Message-----
From: 6pack-bounces+stan.foster=hp.com@autox.team.net
[mailto:6pack-bounces+stan.foster=hp.com@autox.team.net] On Behalf Of George
Loriot
Sent: Wednesday, September 03, 2008 12:43 PM
To: 6pack
Subject: [6pack] pertronix?
Hi Listers
I have a 76 tr6 with pertronix ignition and I suspect the pertronix is
sudenly
giving me trouble. I just did some head work on it, since it began running
rough and a compression test showed 2 adjacent cylinders with very low (15
psi) cranking pressure. I thought it was the gasket between the cylinders,
but it wasn't obvious that the head gasket was blown after i took it apart.
So anyhow, I had the head milled to about 8.3 c/r (3.495 head thickness and
had the valves and seats ground even though they looked good. The machinist
did a 3-angle valve job while he was at it. Valve guides were nice and snug.
Is this the beginning of shipwright's disease?
So I reassembled it, following torque specs and torque order in Bentley, got
150 psi on all cylinders, and it started right up. Nice boost in power
(thanks
to all who suggested the milling) and ran better than ever. For a short
time.
Then, at one run up to 3000 rpm (light load) it started to miss badly. Kept
missing, when the engine is warmed up. And the boost in power seems to be
lost. Checked the valve lash (when cold) and it seemed fine. Timing is 10
deg BTDC at idle (the vacuum retard is disconnected) and advances when
revving
it up. But it misses under load, so I can't really check that the pertronix
is still working then. Has anyone had something like this happen with
pertronix? Suddenly fails when the engine heats up?
Gas feed could be the problem, I guess. The fuel pump seems to be working, I
replaced it a couple of years ago. Does anyone know how to test it? Maybe
I
should recheck the vavle lash tomorrow, just to be sure.
Any help from the wisdom of the list would be greatlyu appreciated.
George Loriot
1976 TR6
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