[Mgs] Bad Fuel Question

Charley Robinson Charley38 at twc.com
Wed Jul 24 05:24:18 MDT 2019

OK and you left out that it's the back EMF from the coil, which is much 
more than 12 volts, that charges the condenser and so on as you describe 
in a series resonant circuit.   My bad, I tried to keep it simple.

Anyway you look at it a leaky (partial short) or open condenser degrades 
the spark and results in rough running.  A fully shorted condenser means 
there will be no spark at all since that's the same as the points not 


On 7/24/2019 2:34 AM, PaulHunt73 via Mgs wrote:
> Not quite right.  With the points closed the condenser is discharged 
> as it is connected across the points. When they open it charges up, as 
> the coil is discharging.  The current/voltage characteristic of a 
> condenser (aka capacitor) is 90 degrees out of phase with an inductor 
> i.e. the coil.  This makes it a tuned circuit as in a radio, and an 
> oscillation is set up, which increases the HT amplitude and its 
> duration.   That's why an engine will always run badly without a 
> condenser, and may not even run at all, depending on several other 
> factors.
> PaulH.
>     ----- Original Message -----
>     Not true, Max.  When the points open, the condenser discharges
>     through the coil in order to perpetuate the spark.  Without the
>     condenser the engine may not even start.  Try it some time. :-)
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