X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 22 Jun 2011 10:35:32 -0400 Message-ID: X-Original-Return-Path: Received: from fmailhost05.isp.att.net ([204.127.217.105] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5028250 for lml@lancaironline.net; Tue, 21 Jun 2011 22:03:53 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.105; envelope-from=poprundell@bellsouth.net Received: from lanny (adsl-074-180-142-037.sip.shv.bellsouth.net[74.180.142.37]) by isp.att.net (frfwmhc05) with SMTP id <20110622020313H05001nb3pe>; Wed, 22 Jun 2011 02:03:14 +0000 X-Originating-IP: [74.180.142.37] X-Vipre-Scanned: 071216330025B507121780-TDI From: "lanny" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] fuel pressure and fuel flow X-Original-Date: Tue, 21 Jun 2011 21:03:06 -0500 X-Original-Message-ID: <63917A34CADE466786CABCC9FA8F47B7@Lanny> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01CC3056.A162F700" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6109 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0004_01CC3056.A162F700 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Berni, The only thing I can offer is fuel vaporization. Check that you have good cooling air on the fuel pump and gascolator. -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Berni Sent: Friday, June 17, 2011 11:45 AM To: lml@lancaironline.net Subject: [LML] fuel pressure and fuel flow Can anyone offer input as their take on the following data. It is fuel flow and fuel pressure readings on a normally aspirated Continental IO520 powered Lancair IV. On a flight today we experienced a very poorly running engine as we gained altitude. Fuel Flow Fuel Pressure On runway 25.57 15 1000' 24.3 15 2000' 24.2 15 3000' 23.0 13 4000' 22.0 13 5000' 20.6 12 6000' 19.0 11 7000' 18.0 10 At 6,500' the engine began surging. When we turned the auxiliary fuel pump on the engine immediately ran fine. We have now had the engine driven pump overhauled. We have pulled vacuum through the entire fuel system and we have no leaks. We replaced 100% of the flexible fuel lines. Metered and un-metered fuel pressures are reset and fine. We are at a loss as to what is causing our engine surging problem. Berni ------=_NextPart_000_0004_01CC3056.A162F700 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Berni,

The only thing I can offer is fuel vaporization. Check that = you have good cooling air on the fuel pump and = gascolator.

-----Original = Message-----
From: Lancair Mailing = List [mailto:lml@lancaironline.net] On = Behalf Of Berni
Sent: Friday, June 17, = 2011 11:45 AM
To: = lml@lancaironline.net
Subject: [LML] fuel = pressure and fuel flow

Can anyone offer input as = their take on the following data. It is fuel flow and fuel pressure readings = on a normally aspirated Continental IO520 powered Lancair IV. On a = flight today we experienced a very poorly running engine as we gained = altitude.

= ; = Fuel = Flow &nbs= p; Fuel Pressure

On runway 25.57 &n= bsp; &nb= sp; 15

1000’ &n= bsp; 24.3 &nb= sp; &nbs= p; 15

2000’ &n= bsp; 24.2 &nb= sp; &nbs= p; 15

3000’ &n= bsp; 23.0 &nb= sp; &nbs= p; 13

4000’ &n= bsp; 22.0 &nb= sp; &nbs= p; 13

5000’ &n= bsp; 20.6 &nb= sp; &nbs= p; 12

6000’ &n= bsp; 19.0 &nb= sp; &nbs= p; 11

7000’ &n= bsp; 18.0 &nb= sp; &nbs= p; 10

At 6,500’ the engine = began surging. When we turned the auxiliary fuel pump on the engine = immediately ran fine. We have now had the engine driven pump overhauled. = We have pulled vacuum through the entire fuel system and we have no = leaks. We replaced 100% of the flexible fuel lines. Metered and un-metered = fuel pressures are reset and fine. We are at a loss as to what is = causing our engine surging problem.

Berni =

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