[ROVERNET - UK] Mixture problems

iudkuy wcygiohs iudkuy at yahoo.com
Mon Oct 15 09:37:01 BST 2007


I fitted a pertronics system to my 105S and had
misfire problems. It came down to the flamethrower
coil. Fitted a different coil and problem vanished.
Flamethrower maybe should be called "bintosser."

Peter B

--- Steven Dibdin <sdibdin at hotmail.com> wrote:

> 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 
> now?
> Anybody out there have any suggestions?
> Many thanks,
> Steven Dibdin 
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