From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Need an EC2 control module for testing
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-945159@logan.com>
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Date: Tue, 17 Nov 2020 13:30:54 -0500
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That should work. Maybe not ideal (carbon pots can get "noisy", but 
should work because input is filtered.

Did you try to measure it as I outlined?

Another place to measure it would be on EC2 J1 pin 26: MixV. (look in 
your manual to make sure that's the pin).
Again, with EC2 powered, you should measure 0 to 5 volts as you turn the 
potentiometer through its range.

Finn

On 11/17/2020 1:12 PM, David Leonard wdleonard@gmail.com wrote:
> Definately a typo.  This is what I am using:
>
> https://www.amazon.com/gp/product/B0111U29C4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
>
> Thanks
>
> Dave Leonard
>
> On Mon, Nov 16, 2020, 3:16 PM Stephen Izett stephen.izett@gmail.com 
> <mailto:stephen.izett@gmail.com> <flyrotary@lancaironline.net 
> <mailto:flyrotary@lancaironline.net>> wrote:
>
>     Hi Dave
>
>     I’m not sure of the pots resistance without a diagram, but it
>     wouldn’t be 5ohms.
>     Was that a typo? I would expect maybe perhaps 5K ohms.
>
>     Steve Izett
>
>     > On 17 Nov 2020, at 4:39 am, David Leonard wdleonard@gmail.com
>     <mailto:wdleonard@gmail.com> <flyrotary@lancaironline.net
>     <mailto:flyrotary@lancaironline.net>> wrote:
>     >
>     > Hi All,
>     >
>     > I have just completed an engine rebuild.  This issue was caused
>     by a crack in the T2 exhaust manifold that melted a coolant line
>     and a fuel line, causing an engine fire.
>     >
>     > I landed safely and had to rebuild the engine because the
>     o-rings melted from the coolant loss.
>     >
>     > Im trying to get the new engine running again. Compression is
>     great, spark is great and I have triple checked the timing.  I am
>     getting some amount of fuel but no combustion.  I have narrowed
>     the problem down to a few possible issues.
>     >
>     >   During the rebuild I replaced the 5ohm potentiometer that
>     controls the mixture because the knob was broken off.  So I
>     possibly mis-wired the replacement potentiometer, it is not
>     actually compatible, or I damaged the board when I trimmed it to
>     allow the new one to fit.  I wonder if anyone has one lying around
>     I could borrow to test this link in the chain.
>     >
>     > Thanks
>     > Dave Leonard
>     > Turbo 13B RV-6
>     > 858-254-3357
>
>
>     --
>     Homepage: http://www.flyrotary.com/
>     Archive and UnSub:
>     http://mail.lancaironline.net:81/lists/flyrotary/List.html
>


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    <div class="moz-cite-prefix">That should work. Maybe not ideal
      (carbon pots can get "noisy", but should work because input is
      filtered.<br>
      <br>
      Did you try to measure it as I outlined?<br>
      <br>
      Another place to measure it would be on EC2 J1 pin 26: MixV. (look
      in your manual to make sure that's the pin).<br>
      Again, with EC2 powered, you should measure 0 to 5 volts as you
      turn the potentiometer through its range.<br>
      <br>
      Finn<br>
      <br>
      On 11/17/2020 1:12 PM, David Leonard <a class="moz-txt-link-abbreviated" href="mailto:wdleonard@gmail.com">wdleonard@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-945159@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      <div dir="auto">Definately a typo.  This is what I am using:
        <div dir="auto"><br>
        </div>
        <div dir="auto"><a
href="https://www.amazon.com/gp/product/B0111U29C4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&amp;psc=1"
            moz-do-not-send="true">https://www.amazon.com/gp/product/B0111U29C4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&amp;psc=1</a><br>
        </div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">Thanks</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">Dave Leonard</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Mon, Nov 16, 2020, 3:16 PM
          Stephen Izett <a href="mailto:stephen.izett@gmail.com"
            moz-do-not-send="true">stephen.izett@gmail.com</a> &lt;<a
            href="mailto:flyrotary@lancaironline.net"
            moz-do-not-send="true">flyrotary@lancaironline.net</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0 0 0
          .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Dave<br>
          <br>
          I’m not sure of the pots resistance without a diagram, but it
          wouldn’t be 5ohms.<br>
          Was that a typo? I would expect maybe perhaps 5K ohms.<br>
          <br>
          Steve Izett<br>
          <br>
          &gt; On 17 Nov 2020, at 4:39 am, David Leonard <a
            href="mailto:wdleonard@gmail.com" target="_blank"
            rel="noreferrer" moz-do-not-send="true">wdleonard@gmail.com</a>
          &lt;<a href="mailto:flyrotary@lancaironline.net"
            target="_blank" rel="noreferrer" moz-do-not-send="true">flyrotary@lancaironline.net</a>&gt;
          wrote:<br>
          &gt; <br>
          &gt; Hi All,<br>
          &gt; <br>
          &gt; I have just completed an engine rebuild.  This issue was
          caused by a crack in the T2 exhaust manifold that melted a
          coolant line and a fuel line, causing an engine fire.<br>
          &gt; <br>
          &gt; I landed safely and had to rebuild the engine because the
          o-rings melted from the coolant loss.<br>
          &gt; <br>
          &gt; Im trying to get the new engine running again. 
          Compression is great, spark is great and I have triple checked
          the timing.  I am getting some amount of fuel but no
          combustion.  I have narrowed the problem down to a few
          possible issues.<br>
          &gt; <br>
          &gt;   During the rebuild I replaced the 5ohm potentiometer
          that controls the mixture because the knob was broken off.  So
          I possibly mis-wired the replacement potentiometer, it is not
          actually compatible, or I damaged the board when I trimmed it
          to allow the new one to fit.  I wonder if anyone has one lying
          around I could borrow to test this link in the chain.<br>
          &gt; <br>
          &gt; Thanks<br>
          &gt; Dave Leonard<br>
          &gt; Turbo 13B RV-6<br>
          &gt; 858-254-3357<br>
          <br>
          <br>
          --<br>
          Homepage:  <a href="http://www.flyrotary.com/"
            rel="noreferrer noreferrer" target="_blank"
            moz-do-not-send="true">http://www.flyrotary.com/</a><br>
          Archive and UnSub:   <a
            href="http://mail.lancaironline.net:81/lists/flyrotary/List.html"
            rel="noreferrer noreferrer" target="_blank"
            moz-do-not-send="true">http://mail.lancaironline.net:81/lists/flyrotary/List.html</a><br>
        </blockquote>
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