X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 15 Oct 2009 08:58:41 -0400 Message-ID: X-Original-Return-Path: Received: from QMTA03.emeryville.ca.mail.comcast.net ([76.96.30.32] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3886357 for lml@lancaironline.net; Thu, 15 Oct 2009 00:10:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.32; envelope-from=j.hafen@comcast.net Received: from OMTA18.emeryville.ca.mail.comcast.net ([76.96.30.74]) by QMTA03.emeryville.ca.mail.comcast.net with comcast id srQW1c0021bwxycA3s9pab; Thu, 15 Oct 2009 04:09:49 +0000 Received: from [10.0.1.196] ([98.247.30.133]) by OMTA18.emeryville.ca.mail.comcast.net with comcast id ssG81c00S2sKoey8esG9b2; Thu, 15 Oct 2009 04:16:09 +0000 User-Agent: Microsoft-Entourage/12.17.0.090302 X-Original-Date: Wed, 14 Oct 2009 21:09:47 -0700 Subject: Re: [LML] TIT vs. EGT, strange but true From: John Hafen X-Original-To: Lancair Mailing List X-Original-Message-ID: Thread-Topic: [LML] TIT vs. EGT, strange but true Thread-Index: AcpNTVUoqrq3uhxaM02upTfzCAdwQQ== In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3338399388_5511601" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3338399388_5511601 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable I=B9m NO expert, but I was taught to climb out at full throttle. Upon reaching my cruising altitude, I bring the RPM back to 2450, and set the MP at 32. At that point I start to lean, and I look at fuel flow rather than TIT. I lean right down to about 17.5 GPH, then start looking at TIT. I then watch the TIT while I delicately adjust mixture to get the temps to 1625 =AD 1650. It feels good at 1630 - - 1640. Fuel flow can vary a few tenths. You may be trying to lean too slowly which will cause your TIT temps to go high. Leaning a little more aggressively (going right to 17.5 on the fuel flow) might get you =B3over the hump=B2 to the lean side and allow you to fine tune from there. At least that works for me the way my engine is set up. You may want to solicit some opinions from others before you do anything radical. John Hafen IVP 413AJ 200 hours TSIO550 On 10/14/09 7:22 PM, "Steve Richard" wrote: > I have noticed a strange but reproducible issue with my TIT's (see EIS > issues.pdf). In cruise and with a steady state power setting (EGT's, fue= l > flow, fuel pressure, man. pressure, rpm all constant), the TIT's climb ov= er 50 > degree F over a 1 hour period. They eventually reach 1650 degrees F and = the > alarms start to go off. I richen the mixture to keep the temperature bel= ow > the recommend 1650. Once the mixture is richened and the TIT's fall belo= w > 1650, the TIT's do not continue to rise for the remainder of the flight. > =20 > I would like to start flying LOP but the TIT rise makes the issue a littl= e > confusing. > =20 > Anyone want to take a shot at this mystery? > =20 > Steve Richard > =20 > Lancair ES > TSIO550 > EIS 6000 engine monitor > =20 >=20 >=20 > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.ht= ml --B_3338399388_5511601 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Re: [LML] TIT vs. EGT, strange but true I’m NO expert, but I was taught to climb out at full throttle.

Upon reaching my cruising altitude, I bring the RPM back to 2450, and set t= he MP at 32.

At that point I start to lean, and I look at fuel flow rather than T= IT.  I lean right down to about 17.5 GPH, then start look= ing at TIT.

I then watch the TIT while I delicately adjust mixture to get the temps to = 1625 – 1650.  It feels good at 1630 - - 1640.  Fuel flow can= vary a few tenths.

You may be trying to lean too slowly which will cause your TIT temps to go = high.  Leaning a little more aggressively (going right to 17.5 on the f= uel flow) might get you “over the hump” to the lean side and all= ow you to fine tune from there.

At least that works for me the way my engine is set up.  You may want = to solicit some opinions from others before you do anything radical.

John Hafen
IVP 413AJ 200 hours
TSIO550




On 10/14/09 7:22 PM, "Steve Richard" <steve@oasissolutions.com> wrote:

I have noticed a strange but reproducible issue with my TIT's = (see EIS issues.pdf).  In cruise and with a steady state power setting = (EGT's, fuel flow, fuel pressure, man. pressure, rpm all constant), the TIT'= s climb over 50 degree F over a 1 hour period.  They eventually reach 1= 650 degrees F and the alarms start to go off.  I richen the mixture to = keep the temperature below the recommend 1650.  Once the mixture is ric= hened and the TIT's fall below 1650, the TIT's do not continue to rise for t= he remainder of the flight.

I would like to start flying LOP but the TIT rise makes the issue a little = confusing.
Anyone want to take a shot at this mystery= ?
=
Steve Richard
Lancair ES
TSIO550
EIS 6000 engine monitor

--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html
--B_3338399388_5511601--