Neil
I have had more than one experience with incorrect coil and the symptems
sound similer to what you are describing. I can't guarantee this to be the
solution but It has cured a couple of my cars. P.S. even the "experts"
told me the wrong coil/resistor combination until I tried it myself and
proved them wrong.
All coils are 6 Volt coils inside. They either have an internal balast
resisitor (12 Volt) or an external balast resistor (6 Volt) if you take
a 12 Volt coil and add a ballast resistor then you are only running
the coil on 3 volts inside and it will not properly energize no matter
how much dwell you set.
Fortunately this is easy to test. Try a jumper across the ballast resistor
esentially taking it out of the circuit and if it runs correctly then you
know your problem.
Neil Cotty wrote:
> Hi all,
>
> I've had a dual point Mallory installed in my V8 along with a Weber 500. I
> appear to have some serious timing problems. The car was running extremely
> well, but something has gone amiss.
>
> I read that you set the dwell of the points individually to 28deg then the
> total dwell will be around 32deg. I have set this as it was at 43 when the
> misfire started appearing, but I am still experiencing savage misfire under
> load with reasonable, and large throttle openings. I have her at 8 deg at
> 800rpm. Vacumn connected, the problem is much worse. I think the Mallory is
> advancing way too much but can't be sure. The sound is like
> 'rrrrr-rrrrrrrr-rrrrrrrr' when the misfire appears, almost like a rev
> limiter or a bad coil. My existing Sport coil was wired up with a Ballast
> resistor to support the Mallory unit. I've seen you can adjust the max
> advance of the Mallory. Any recommendations on how to do this, how to check
> it and what to set it at? It looks like the base plate has to come off at
> the very least.
>
> Stuck here at work, driving home looking very unlikely! :( Any help
> appreciated! :)
>
> Cheers,
> Neil
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