[ROVERNET - UK] Mixture problems
sdibdin at hotmail.com
Sun Oct 14 15:47:08 BST 2007
Hi Rover Gurus,
I've recently fitted a petronix ignition system to my '68 2000 TC along with
their 'flamethrower' coil (god awful name by the way). Timing is spot on, I
had to replace the old worn out advance weight springs as they were weak
with age. I have checked the advance curve with a strobe light and tacho
against the specs for my engine (10:1 compression) and that is as it should.
My problem is that the fuel mixture seems to be off now. If I set the carbs'
at idle using the workshop manual method of lifting the pins and getting the
idle to rise then fall it runs a little rough at idle, after a few minutes
of running the plugs get sooted up. Suggesting it's too rich at idle. On the
road however, it runs far better than before, better acceleration, more
responsive and a smoother delivery of power.
If I adjust the mixture at idle using my colourtune the idle pretty smooth
but it is running too lean on the road, power's lacking until I pull out the
choke to enrich the mixture.
So my questions are: Has anyone else found a similar problem after changing
over to Petronix? Did they go for different needle profiles to accommodate
the new system? Do I need to find a rolling road to tune with new needles
Anybody out there have any suggestions?
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