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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Failure of an LS-1 D-580 type ignition coil
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Maybe unburned air/fuel is burning as it exits the exhaust port, raising th=
e EGT.
Brian Trubee



-----Original Message-----
From: DLOMHEIM <DLOMHEIM@aol.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, Mar 9, 2012 8:23 pm
Subject: [FlyRotary] Failure of an LS-1 D-580 type ignition coil


Tracy wrote:  >As usual, the in-flight symptom was a rise in EGT on the aff=
ected rotor.
=20
Can someone describe the science behind a "rise in EGT" when we lose a sing=
le coil.  I would have expected a drop in EGT due to less thorough burning =
of the mixture and therefore excess un-burnt fuel which I thought would pro=
vide cooler temps of the exhaust stream as it passes the EGT probe.
=20
Must be missing something very basic here...
=20
Thanks for any clarity!  :)
=20
Doug Lomheim
RV-9A / 13B FWF


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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>Maybe unburned air/fuel is burning as it exits the exhaust port, raisi=
ng the EGT.</div>


<div>Brian Trubee<br>
<br>
<br>
</div>


<div style=3D"FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">=
-----Original Message-----<br>
From: DLOMHEIM &lt;DLOMHEIM@aol.com&gt;<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Fri, Mar 9, 2012 8:23 pm<br>
Subject: [FlyRotary] Failure of an LS-1 D-580 type ignition coil<br>
<br>


<div id=3DAOLMsgPart_1_be5d613d-c641-4c0d-a863-a0e224021783><FONT color=3D#=
000000 size=3D2 face=3DArial>

<div>Tracy wrote:&nbsp; &gt;As usual, the in-flight symptom was a rise in E=
GT on the affected rotor.</div>


<div>&nbsp;</div>


<div>Can someone describe the science behind a "rise in EGT" when we lose a=
 single coil.&nbsp; I would have expected a drop in EGT due to less thoroug=
h burning of the mixture and therefore&nbsp;excess un-burnt fuel which I th=
ought would provide&nbsp;cooler temps of the exhaust stream as&nbsp;it pass=
es the&nbsp;EGT probe.</div>


<div>&nbsp;</div>


<div>Must be missing something very basic here...</div>


<div>&nbsp;</div>


<div>Thanks for any clarity!&nbsp; :)</div>


<div>&nbsp;</div>


<div>Doug Lomheim</div>


<div>RV-9A / 13B FWF</div>
</FONT></div>
<!-- end of AOLMsgPart_1_be5d613d-c641-4c0d-a863-a0e224021783 --></div>
</font>
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