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Re: [Mgs] Bad Fuel Question

To: Max Heim <mvheim@sonic.net>, Mg List <mgs@autox.team.net>, PaulHunt73 <paulhunt73@virginmedia.com>
Subject: Re: [Mgs] Bad Fuel Question
From: Charley Robinson via Mgs <mgs@autox.team.net>
Date: Wed, 24 Jul 2019 06:24:18 -0500
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
References: <773266378.5449731.1563816981900.ref@mail.yahoo.com> <773266378.5449731.1563816981900@mail.yahoo.com> <CABXhz8-daUf=8NfpBRda9FUYyws0UH=J3Nxg9ZGXUeDTMh3fbg@mail.gmail.com> <1212B08C-5593-45F0-9FF8-7DC9B6E1398F@sonic.net> <6f61f714-0475-486a-37f9-acb9a0864ab5@twc.com> <E74F95D5015E4949A0DDD6B1A1A7B4E9@paul>
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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 
opening.

CR

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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    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.  <br>
    <br>
    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 opening.<br>
    <br>
    CR<br>
    <br>
    <div class="moz-cite-prefix">On 7/24/2019 2:34 AM, PaulHunt73 via
      Mgs wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:E74F95D5015E4949A0DDD6B1A1A7B4E9@paul">
      <meta content="text/html; charset=windows-1252"
        http-equiv="Content-Type">
      <meta name="GENERATOR" content="MSHTML 8.00.6001.23588">
      <style></style>
      <div><font size="2">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.</font></div>
      <div> </div>
      <div><font size="2">PaulH.</font></div>
      <blockquote style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT:
        5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
        <div style="FONT: 10pt arial">----- Original Message ----- </div>
        <div><br>
        </div>
        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. <span
          class="moz-smiley-s1"><span>:-)</span></span><br>
      </blockquote>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <pre class="moz-quote-pre" 
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