Re: [TCML] Optimizing coil performance

["DC Cox" <resonance@xxxxxxxxxxxx>]

It may be less expensive to drop in some PF correction caps.  Use motor RUN
caps not motor start caps.

Dr. Resonance



On Fri, Aug 15, 2008 at 5:58 PM, <ConorPerry@xxxxxxxxxxx> wrote:

> Thanks for the tip DC!
>
> On my little 4" coil I had built it so that the secondary windings started
> at the same
> elevation as the secondary coil.  Can't say why I did that now, but
> probably(maybe?) had a
> reason at the time.
>
> Anyway, just did some testing by raising the secondary up 3/4" and I could
> tell the
> difference right away.  With my gap set at 1/4" and the sucker-gap vacuum
> running about half speed it now chugs along nicely, better than before.  I
> think I'm at the limit of what i can pull from the wall outlet.  My meter
> shows bouncing around 15Amps and I don't have any power factor caps.  I
> guess that and a bigger variac will be my next equipment purchases.  I've
> got a 60Amp 230 drop for my welder that I could tap into.  Then I can move
> all my gear up to a larger coil! Already started collecting parts.
>
> CP8071
>
> ----- Original Message ----- From: "DC Cox" <resonance@xxxxxxxxxxxx>
>
>> <clip>
>> With an 8 inch dia sec you need to experiment with sec elevation above the
>> horizontal pri plane.  Usually around 3.75 to 4 inches with 1.25 pri-sec
>> spacing works good.  Again, with an 18 inch dia inductor the vertical
>> spacing works best with 6.75 inches and 9 inches is required for any 24
>> inch
>> dia sec.  I discovered years ago this relationship is a near linear
>> function
>> both upwards and downwards.  I did a lot of experiments with various size
>> coils using a large brass ead-screw setup to actually raise the sec up and
>> down while it was running.  I was quite surprised how high the sec needs
>> to
>> be elevated to achieve maximum spark length.  You can experiment with your
>> setup using 1/2 - 3/4" chunks of plywood to raise the sec small increments
>> at a time.
>> <clip>
>> Dr. Resonance
>>
>
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