X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 03 Feb 2009 15:56:54 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3473279 for lml@lancaironline.net; Mon, 02 Feb 2009 18:07:20 -0500 Received: from Sky2high@aol.com by imo-d20.mx.aol.com (mail_out_v39.1.) id q.d4a.4972227f (14467) for ; Mon, 2 Feb 2009 18:07:15 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Mon, 2 Feb 2009 18:07:14 EST Subject: Re: [LML] cylinder wear-to lean or not too lean X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1233616034" X-Mailer: AOL 9.1 sub 5003 X-Spam-Flag:NO -------------------------------1233616034 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Gerard, Not enough information for a really good answer. What are your peak EGTs? Have you tried to run a GAMI Lean Test (_http://gami.com/gamijectors/leantest.php_ (http://gami.com/gamijectors/leantest.php) ) even though it may not be useful for a carbureted engine? At least study the concepts. My EGT probes are about 4" downstream of the exhaust and I peak at about 1450. 31 to 32 l/hr is about 8.2 to 8.45 gph. At cruise at 4500' MSL 2480 rpm and 25" MAP I burn about 10.6 gph and the EGTs are about 130-140 degrees Rich Of Peak. This is best power for the rpm/map parameters. Of course, I am injected. It is very difficult to control the power in each cylinder in a carbureted engine since the throttle position may actually change the A/F ratio to each cylinder. Perhaps you have recorded cruise parameters and those might help with the analysis. Generally, your EGTs seem to be too high and if running rich of peak, you are in a very bad place to be running that engine. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) In a message dated 2/2/2009 11:13:00 A.M. Central Standard Time, gerardoconnell@optusnet.com.au writes: just burnt out the exhaust valves on 1 and 3 (got 900 hours on my 0-320) the shop reckons I'm running it too lean. I had an EDM 700 installed last year and follow the directions for best power-usually gives EGT 1450-1500 and 31-32 Litres per hour what say y'all Gerard > -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html **************Great Deals on Dell Laptops. Starting at $499. (http://pr.atwola.com/promoclk/100000075x1217883258x1201191827/aol?redir=http://ad.doubleclick. net/clk;211531132;33070124;e) -------------------------------1233616034 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Gerard,

Not enough information for a really good answer. What are your pe= ak=20 EGTs? Have you tried to run a GAMI Lean Test (http://gami.com/gamijector= s/leantest.php)=20 even though it may not be useful for a carbureted engine? At least stu= dy=20 the concepts.

My EGT probes are about 4" downstream of the exhaust and I peak at abou= t=20 1450. 31 to 32 l/hr is about 8.2 to 8.45 gph. At cruise at= =20 4500' MSL 2480 rpm and 25" MAP I burn about 10.6 gph and the EGTs are about=20 130-140 degrees Rich Of Peak. This is best power for the rpm/map=20 parameters. Of course, I am injected.

It is very difficult to control the power in each cylinder in a carbure= ted=20 engine since the throttle position may actually change the A/F ratio to each= =20 cylinder. Perhaps you have recorded cruise parameters and those might=20= help=20 with the analysis.

Generally, your EGTs seem to be too high and if running rich of peak, y= ou=20 are in a very bad place to be running that engine.

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

In a message dated 2/2/2009 11:13:00 A.M. Central Stand= ard=20 Time, gerardoconnell@optusnet.com.au writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>

just burnt out the exhaust valves on 1 and 3 (got 900 hou= rs on=20 my 0-320)

the shop reckons I'm running it too lean. I had an EDM 70= 0=20 installed last year and follow the directions for best power-usually gives= EGT=20 1450-1500 and 31-32 Litres per hour

what say=20 y'all

Gerard

>

--
For archives and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html

<= a href=3D"http://pr.atwola.com/promoclk/100000075x1217883258x1201191827/aol?= redir=3Dhttp://ad.doubleclick.net/clk;211531132;33070124;e">Great Deals on D= ell Laptops. Starting at $499. -------------------------------1233616034--