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miro forest
Senior Member
Username: miro
Post Number: 1187
Registered: 11-2001
| | Posted on Tuesday, July 12, 2022 - 12:30 pm: | 
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Here's the diagram of the configuration that I use.
There are other variants of the idea, and all of
them work.
I have found that the 'optional' resistor in series
with the coil can be as high as 5 or
6 ohms and you can still get a really healthy
spark.
The minimum power rating for the resistor is
5 Watts - 7 or 10 Watts is OK.
I have also used the "coil-over-plug" coils to
great success instead of the conventional 12V
automotive coil.
The key thing that is an ABSOLUTE MUST is to
NEVER, EVER operate the ignition box without a
spark gap -doing so will very likely result
in an internal short circuit in the coil or an
internal insulation breakdown.
I prefer to use Mylar film capacitors (condensers)
that have a minimum 600V DC rating.
Capacitors with lower voltage ratings might work
for a while but ultimately they breakdown.
I've probably made close to 100 of these for
other folks over the past 7 years and the
only time there are issues, is when folks try
to use a 6 V battery - this system NEEDS a 12V
battery.
Miro
Please ask questions. I also urge folks to take
the time to make a nice wooden box with brass
hardware to achieve a period look. |
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