X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 12 Nov 2007 16:08:56 -0500 Message-ID: X-Original-Return-Path: Received: from mta9.adelphia.net ([68.168.78.199] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2467487 for lml@lancaironline.net; Mon, 12 Nov 2007 08:20:24 -0500 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.199; envelope-from=glcasey@adelphia.net Received: from [75.82.245.131] by mta9.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20071112131944.EJSK22686.mta9.adelphia.net@[75.82.245.131]> for ; Mon, 12 Nov 2007 08:19:44 -0500 Mime-Version: 1.0 (Apple Message framework v752.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-14--329465937 X-Original-Message-Id: From: Gary Casey Subject: Re: #4 cylinder EGT X-Original-Date: Mon, 12 Nov 2007 05:19:42 -0800 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.752.2) --Apple-Mail-14--329465937 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Matt, Excellent. That is, in my opinion, the most likely cause of the change. And I wouldn't be surprised if there were no telltale exhaust stains on the outside of the pipe. It is entirely possible and maybe likely that there will be little or no leakage of exhaust out the crack, but it is very likely that cold air will be sucked into the crack, easily creating a low exhaust temperature reading. The high pressure exhaust pulse lasts for only a few crank degrees and for the rest of the cycle there is no pressure in the exhaust pipe. And even though the pressure is high for an instant the high velocity of the exhaust can create a local low pressure area. Gary > > From: mmcmanus@grandecom.net > Date: November 11, 2007 4:03:45 PM PST > To: lml@lancaironline.net > Subject: Re: [LML] #4 cylinder EGT > > > I was crossing New Mexico in August in my 360. In the middle of > nowhere (of > course) I suddenly got a slight noise increase, and lost 200-300 > degrees on the > EGT of one cylinder. No change in speed. Diverted to Double Eagle in > Albuquerque. They cleaned the injector for that cylinder - no > change. Next we > pulled the lower cowl to get to the bottom plugs and whalla, the > exhaust > manifold had a huge crack just below the flange allowing exhaust > gases to > escape so the probe for the EGT wasn't getting as hot. They welded > it back up > and I was on my way. > > So the obvious (the injector) wasn't the problem at all. > > Matt McManus > LNC2 360 > > Quoting Dan Reagan : > >> About 10 flight hours ago my #4 EGT dicided to start running about >> 150 >> degrees less than the others. This is a FADEC engine so there is a >> possibility of injector problems but other than that please give >> me some >> ideas what has changed. The temp shows approximate correct >> ambient temp when >> shut down overnight. >> >> Any help would be greatly appreciated. >> >> Thanks, >> Dan Reagan >> IVP TSIO550 450+hours --Apple-Mail-14--329465937 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 Matt,
Excellent.=A0 That is, = in my opinion, the most likely cause of the change.=A0 And I wouldn't be = surprised if there were no telltale exhaust stains on the outside of the = pipe.=A0 It is entirely possible and maybe likely that there will be = little or no leakage of exhaust out the crack, but it is very likely = that cold air will be sucked into the crack, easily creating a low = exhaust temperature reading.=A0 The high pressure exhaust pulse lasts = for only a few crank degrees and for the rest of the cycle there is no = pressure in the exhaust pipe.=A0 And even though the pressure is high = for an instant the high velocity of the exhaust can create a local low = pressure area.
Gary

From: mmcmanus@grandecom.net
Date: November 11, 2007 4:03:45 PM = PST
To: lml@lancaironline.net
Subject: Re: [LML] #4 cylinder = EGT


I was = crossing New Mexico in August in my 360. In the middle of nowhere = (of
course) I suddenly got a slight = noise increase, and lost 200-300 degrees on the
EGT of one cylinder.=A0 No change in speed.=A0 Diverted to Double Eagle = in
Albuquerque.=A0 They cleaned the injector for = that cylinder - no change. Next we
pulled the = lower cowl to get to the bottom plugs and whalla, the exhaust
manifold had a huge crack just below the flange = allowing exhaust gases to
escape so the = probe for the EGT wasn't getting as hot. They welded it back = up
and I was on my way.

So the = obvious (the injector) wasn't the problem at all.

Matt = McManus
LNC2 360

Quoting = Dan Reagan <dreagan@fuse.net>:

About 10 flight hours ago my #4 = EGT dicided to start running about 150
degrees = less than the others.=A0 = This is a FADEC engine so there is a
ideas what has changed.=A0 The temp shows approximate = correct ambient temp when
shut down = overnight.

Any help would be greatly appreciated.

Dan Reagan
IVP TSIO550 450+hours
=

= --Apple-Mail-14--329465937--