X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([204.127.217.103] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5436066 for flyrotary@lancaironline.net; Sat, 10 Mar 2012 00:48:38 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.217.103; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-98-85-145-114.mco.bellsouth.net[98.85.145.114]) by isp.att.net (frfwmhc03) with SMTP id <20120310054801H03005rh7ge>; Sat, 10 Mar 2012 05:48:01 +0000 X-Originating-IP: [98.85.145.114] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Failure of an LS-1 D-580 type ignition coil Date: Sat, 10 Mar 2012 00:48:02 -0500 Message-ID: <9EDAAA2591154ABA8E130EA5ADB9FBCF@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0058_01CCFE57.73113860" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Acz+dYj/eF9bh0zBTVulCn+PUon0qQAC8Gtg X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_0058_01CCFE57.73113860 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Fuel not burned in the engine burns in the exhaust. _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com Sent: Friday, March 09, 2012 11:23 PM To: Rotary motors in aircraft 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 affected rotor. Can someone describe the science behind a "rise in EGT" when we lose a single 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 provide cooler temps of the exhaust stream as it passes the EGT probe. Must be missing something very basic here... Thanks for any clarity! :) Doug Lomheim RV-9A / 13B FWF ------=_NextPart_000_0058_01CCFE57.73113860 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Fuel not burned in the engine burns = in the exhaust.

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com
Sent: Friday, March 09, = 2012 11:23 PM
To: Rotary motors in aircraft
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 affected rotor.

 

=

Can someone describe the science = behind a "rise in EGT" when we lose a single 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 = provide cooler temps of the exhaust stream as it passes the EGT = probe.

 

=

Must be missing something very = basic here...

 

=

Thanks for any clarity!  = :)

 

=

Doug = Lomheim

RV-9A / 13B = FWF

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