[ROVERNET - UK] Mixture problems-resolved, sort of...
lewill at ctcweb.net
Sat Oct 20 13:41:01 BST 2007
Steven, I too am having a tough time with tuning my TC. I have a Petronix
unit in place and I would be interested in what they say when you call
them. Regards, Larry
----- Original Message -----
From: "Steven Dibdin" <sdibdin at hotmail.com>
To: <rovernet at lyris.ccdata.com>
Sent: Thursday, October 18, 2007 3:23 PM
Subject: [ROVERNET - UK] Mixture problems-resolved, sort of...
Thank you for all your responses. I have tried a number of solutions and the
New flame thrower coil with points give the best idle and performance. This
must be the first case of Lucas products beating modern electronics. I will
call petronix to discuss later on. When left to idle plugs would soot up
from incomplete combustion after about 90 secs.
The spark at idle with the petronix unit in place was yellow and quite weak
(0.030" gap on plugs as per instructions).
With the points in place it was much stronger and would jump a much bigger
gap. Engine idled for 5 minutes with out a change in idle speed or
I Checked plugs after and they were a nice biscuit colour suggesting correct
mixture and full combustion. This is with the mixture set as per the manual.
Lift pins 1 mm engine note rises then drops on each carb.
So it would seem the mixture was a red herring, it was down to a weak spark
at idle causing poor ignition and rough running. Strange that at higher RPMs
the problem ceased. I still wonder if it was down to voltage difference at
idle affecting the hall sensor.
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