From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: EGT probes location
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-1461617@logan.com>
Message-ID: <834e64de-2664-4cc3-329b-7e9fb2a25086@verizon.net>
Date: Wed, 28 Apr 2021 20:43:41 -0400
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Thanks Neil, Steve, Matt and Charlie.

I did try to get tip of probes centered in the openings, but now I 
remember that a very slight difference made a significant difference in 
readings during initial engine runs.

So I think I'll ignore it for now (and set the alarm higher). Then later 
on I can try to adjust the front/rear rotor fuel ratio. Perhaps watching 
fuel flow vs RPM will be a better way to optimize this?

Definitely a disadvantage to using the stock exhaust manifold. The ideal 
setup would probably be separate (outer) runners, perhaps with an O2 
sensor in each runner.

Finn

On 4/28/2021 7:21 PM, Matt Boiteau mattboiteau@gmail.com wrote:
> Cyl 1 will be hotter since it gets the coolant the last. I can be 
> anywhere from 50-100f difference sometimes.
>
> I think too, with our high temperatures, the accuracy of the probes 
> probably have a good amount of +/- in there.
>
> - Matt Boiteau
>
>
> On Wed, Apr 28, 2021 at 7:15 PM Stephen Izett stephen.izett@gmail.com 
> <mailto:stephen.izett@gmail.com> <flyrotary@lancaironline.net 
> <mailto:flyrotary@lancaironline.net>> wrote:
>
>     Hi Finn
>
>     Yes.
>     An example of our EGT’s at WOT take off - Lambda ~0.9 / AFR 13.3
>     1598 & 1679 - So 81 higher.
>     I’m not sure our EGT probes are inserted exactly the same distance
>     into the header.
>     Not sure the variation in temp this might cause.
>     One of our probes is burnt out now.
>
>     Cheers
>
>     Steve Izett
>
>
>     > On 29 Apr 2021, at 5:30 am, Finn Lassen finn.lassen@verizon.net
>     <mailto:finn.lassen@verizon.net> <flyrotary@lancaironline.net
>     <mailto:flyrotary@lancaironline.net>> wrote:
>     >
>     > So, I'm using the Renesis stock exhaust manifold.
>     >
>     > Tried to mount the EGT probes as close as possible and same
>     distance from the ports.
>     >
>     > However, at high power I'm seeing as much as 120F higher on rotor 2.
>     >
>     > Exhaust gas from rotor 1 passes by rotor 2 exhaust port so I'm
>     wondering if that somehow increases rotor 2 EGT readings.
>     >
>     > Caught my attention today when EGT2 got above 1,800F at 6,200
>     RPM and 161 mph TAS @ 3,300' density altitude.
>     >
>     > Any of you that's using the stock exhaust manifold run into this?
>     >
>     > Finn
>     >
>     >
>     > ---
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    <div class="moz-cite-prefix">Thanks Neil, Steve, Matt and Charlie.<br>
      <br>
      I did try to get tip of probes centered in the openings, but now I
      remember that a very slight difference made a significant
      difference in readings during initial engine runs.<br>
      <br>
      So I think I'll ignore it for now (and set the alarm higher). Then
      later on I can try to adjust the front/rear rotor fuel ratio.
      Perhaps watching fuel flow vs RPM will be a better way to optimize
      this?<br>
      <br>
      Definitely a disadvantage to using the stock exhaust manifold. The
      ideal setup would probably be separate (outer) runners, perhaps
      with an O2 sensor in each runner.<br>
      <br>
      Finn<br>
      <br>
      On 4/28/2021 7:21 PM, Matt Boiteau <a class="moz-txt-link-abbreviated" href="mailto:mattboiteau@gmail.com">mattboiteau@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-1461617@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      <div dir="ltr">Cyl 1 will be hotter since it gets the coolant the
        last. I can be anywhere from 50-100f difference sometimes.<br>
        <br>
        I think too, with our high temperatures, the accuracy of the
        probes probably have a good amount of +/- in there.<br>
        <br clear="all">
        <div>
          <div dir="ltr" class="gmail_signature"
            data-smartmail="gmail_signature">
            <div dir="ltr">
              <div>
                <div dir="ltr">- Matt Boiteau</div>
              </div>
            </div>
          </div>
        </div>
        <br>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Wed, Apr 28, 2021 at 7:15
          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:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi
          Finn<br>
          <br>
          Yes. <br>
          An example of our EGT’s at WOT take off - Lambda ~0.9 / AFR
          13.3 <br>
          1598 &amp; 1679 - So 81 higher.<br>
          I’m not sure our EGT probes are inserted exactly the same
          distance into the header. <br>
          Not sure the variation in temp this might cause.<br>
          One of our probes is burnt out now.<br>
          <br>
          Cheers<br>
          <br>
          Steve Izett<br>
          <br>
          <br>
          &gt; On 29 Apr 2021, at 5:30 am, Finn Lassen <a
            href="mailto:finn.lassen@verizon.net" target="_blank"
            moz-do-not-send="true">finn.lassen@verizon.net</a> &lt;<a
            href="mailto:flyrotary@lancaironline.net" target="_blank"
            moz-do-not-send="true">flyrotary@lancaironline.net</a>&gt;
          wrote:<br>
          &gt; <br>
          &gt; So, I'm using the Renesis stock exhaust manifold.<br>
          &gt; <br>
          &gt; Tried to mount the EGT probes as close as possible and
          same distance from the ports.<br>
          &gt; <br>
          &gt; However, at high power I'm seeing as much as 120F higher
          on rotor 2.<br>
          &gt; <br>
          &gt; Exhaust gas from rotor 1 passes by rotor 2 exhaust port
          so I'm wondering if that somehow increases rotor 2 EGT
          readings.<br>
          &gt; <br>
          &gt; Caught my attention today when EGT2 got above 1,800F at
          6,200 RPM and 161 mph TAS @ 3,300' density altitude.<br>
          &gt; <br>
          &gt; Any of you that's using the stock exhaust manifold run
          into this?<br>
          &gt; <br>
          &gt; Finn<br>
          &gt; <br>
          &gt; <br>
          &gt; ---<br>
          &gt; This email has been checked for viruses by Avast
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          &gt; <br>
          &gt; <br>
          &gt; --<br>
          &gt; Homepage:  <a href="http://www.flyrotary.com/"
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