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<p>Your recap is correct, AFAIK, but the condenser is also part of a
timing circuit created when current flows through a resistance and
into the capacitor (RC circuit). I don't know the exact theory,
but changing the value of the cap would likely upset the timing of
the spark firing event. <br>
</p>
<p>Bob<br>
</p>
<br>
<div class="moz-cite-prefix">On 12/28/2016 1:56 PM, Ed O'Neal wrote:<br>
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<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Gents,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">By
way of recap: When the points close current flows through
the primary (12 volt) side of the coil. When they open the
magnetic field around the coil collapses across the
secondary coil windings (high voltage) driving a high
voltage current across the plug gap and firing the
cylinder. At the same time the magnetic field also across
the primary windings attempting to drive a current across
the open points and creating a relatively high voltage
(perhaps 400 volts) which will want to arc across the open
points and wearing them out quickly. To mitigate this a
condenser (capacitor) is places between the points coil
connection and ground which absorbs the “shock” of the
current being driven towards the open points and reducing
the potential for arcing across the points allowing them to
last longer.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Question:
Why would a larger condenser (capacitor) not reduce the
potential for arcing across the points even more? What
might be the down side of such an attempt???<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Thanks
for your expertise in advance.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Ed<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<br>
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