X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 12 Jul 2010 17:53:23 -0400 Message-ID: X-Original-Return-Path: Received: from imr-da04.mx.aol.com ([205.188.105.146] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4389797 for lml@lancaironline.net; Mon, 12 Jul 2010 11:15:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.146; envelope-from=VTAILJEFF@aol.com Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imr-da04.mx.aol.com (8.14.1/8.14.1) with ESMTP id o6CFEe3B032344 for ; Mon, 12 Jul 2010 11:14:40 -0400 Received: from VTAILJEFF@aol.com by imo-da04.mx.aol.com (mail_out_v42.9.) id q.e3b.4adb9aa (43973) for ; Mon, 12 Jul 2010 11:14:34 -0400 (EDT) Received: from smtprly-da03.mx.aol.com (smtprly-da03.mx.aol.com [205.188.249.146]) by cia-dd03.mx.aol.com (v129.4) with ESMTP id MAILCIADD036-5bba4c3b3152340; Mon, 12 Jul 2010 11:14:34 -0400 Received: from webmail-stg-d11 (webmail-stg-d11.sim.aol.com [205.188.185.228]) by smtprly-da03.mx.aol.com (v129.4) with ESMTP id MAILSMTPRLYDA031-5bba4c3b3152340; Mon, 12 Jul 2010 11:14:26 -0400 References: X-Original-To: lml@lancaironline.net Subject: Re: [LML] Fuel Control problem X-Original-Date: Mon, 12 Jul 2010 11:14:26 -0400 X-AOL-IP: 75.56.143.73 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: vtailjeff@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CCEFEC0D31E3E0_1128_1B145_webmail-stg-d11.sysops.aol.com" X-Mailer: AOL Webmail 32244-STANDARD Received: from 75.56.143.73 by webmail-stg-d11.sysops.aol.com (205.188.185.228) with HTTP (WebMailUI); Mon, 12 Jul 2010 11:14:26 -0400 X-Original-Message-Id: <8CCEFEC0D096C6F-1128-BD71@webmail-stg-d11.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: VTAILJEFF@aol.com ----------MB_8CCEFEC0D31E3E0_1128_1B145_webmail-stg-d11.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" I would check your compression...=20 -----Original Message----- From: Steve Colwell To: lml@lancaironline.net Sent: Mon, Jul 12, 2010 8:41 am Subject: [LML] Fuel Control problem On climb out to 14,500=E2=80=99 yesterday I was having trouble leaning to= 1300 degrees. The mixture knob was extra sensitive so I favored the ric= h side. I had just topped off with 40 gal. from an above ground tank tha= t was probably around 80 to 85 degrees. Low boost was used from takeoff= to about 1500=E2=80=99 agl., RPM was reduced to 2500 and leaning began.= Normally, maintaining 1300 degrees on the hottest cyl. in the climb (pe= r The Advanced Pilot Course) is easy. (On the previous flight to 15,500= =E2=80=99 for 2.5 hours I noticed it did not lean normally but I was able= to go LOP and it held the fuel flow @ 9.8 gph. No fuel had been added an= d temp on the ground was about 70 degrees.) =20 When we reached 14,500=E2=80=99, we accelerated in level off, reduced RPM= to 2300 and started to ease the mixture knob back to go Lean of Peak. At= 16.5 gal. per hr., slowly turning the Vernier about 1/8=E2=80=9D as norma= l, fuel flow jumped to 9 gph. with the engine faltering. I tried this twi= ce before concluding =E2=80=9Cthis ain=E2=80=99t right=E2=80=9D. I wish= I had thought to use Low Boost or to check Fuel Pressure, but I didn=E2= =80=99t. We were over the Sierras and headed for the nearest airport but= maintained altitude and finally circled down over home base. I did not= mess with the mixture on decent thinking a running engine was the best op= tion. =20 =20 The control cable, bracket, arm and movement on the mixture are OK. Testi= ng for leaks, I had the mixture in idle cut off, throttle open full. Wit= h Low Boost for about 10 seconds, no leaks. On High Boost for about 10 se= conds, I got about a pint of fuel out the sniffle valve. Hmmmmm, it=E2=80= =99s not supposed to do that. =20 =20 Sounds like the Metering Unit, what do you think? =20 Steve Colwell Legacy IO-550N mostly stock, no ram air or injector mods.,= 225 hours tt. =20 =20 ----------MB_8CCEFEC0D31E3E0_1128_1B145_webmail-stg-d11.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" I would check your compres= sion...



-----Original Message-----
From: Steve Colwell <mcmess1919@yahoo.com>
To: lml@lancaironline.net
Sent: Mon, Jul 12, 2010 8:41 am
Subject: [LML] Fuel Control problem

On climb out to 14,500=E2=80=99 yesterday I was hav= ing trouble leaning to 1300 degrees.   The mixture knob was extr= a sensitive so I favored the rich side.   I had just topped off= with 40 gal. from an above ground tank that was probably around 80 to 85= degrees.   Low boost was used from takeoff to about 1500=E2=80= =99 agl.,  RPM was reduced to 2500 and leaning began.   Nor= mally, maintaining 1300 degrees on the hottest cyl. in the climb (per The= Advanced Pilot Course) is easy.   (On the previous flight to 15= ,500=E2=80=99 for 2.5 hours I noticed it did not lean normally but I was= able to go LOP and it held the fuel flow @ 9.8 gph.  No fuel had bee= n added and temp on the ground was about 70 degrees.)
 
When we reached 14,500=E2=80=99, we accelerated in= level off, reduced RPM to 2300 and started to ease the mixture knob back= to go Lean of Peak.  At 16.5 gal. per hr., slowly turning the Vernie= r about 1/8=E2=80=9D as normal, fuel flow jumped to 9 gph. with the engine= faltering.  I tried this twice before concluding =E2=80=9Cthis ain= =E2=80=99t right=E2=80=9D.   I wish I had thought to use Low Boo= st or to check Fuel Pressure, but I didn=E2=80=99t.  We were over the= Sierras and headed for the nearest airport but maintained altitude and fi= nally circled down over home base.   I did not mess with the mix= ture on decent thinking a running engine was the best option. 
 
The control cable, bracket, arm and movement on the= mixture are OK.  Testing for leaks, I had the mixture in idle cut of= f, throttle open full.   With Low Boost for about 10 seconds, no= leaks.  On High Boost for about 10 seconds, I got about a pint of fu= el out the sniffle valve.  Hmmmmm, it=E2=80=99s not supposed to do th= at. 
 
Sounds like the Metering Unit, what do you think?
 
Steve Colwell   Legacy IO-550N mostly sto= ck, no ram air or injector mods., 225 hours tt.
 
 
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