X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 21 Jun 2009 20:29:49 -0400 Message-ID: X-Original-Return-Path: Received: from web62503.mail.re1.yahoo.com ([69.147.75.95] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with SMTP id 3688711 for lml@lancaironline.net; Fri, 19 Jun 2009 15:21:02 -0400 Received-SPF: none receiver=logan.com; client-ip=69.147.75.95; envelope-from=charliekohler@yahoo.com Received: (qmail 41094 invoked by uid 60001); 19 Jun 2009 19:20:27 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=VgP9+28NOGl+l6JnogOMr21k5PvrXwrxr1b8YsI7UGxBWn5jEkvakImlybhulgzKkCF1OJcoWnUhVQBJLxPGFnp7G1asKWQQWwTUwbHwvOYZQOqP8sUHYU9rGDgE7PnoJ9zIjcVc/AzvF7UYR7G1QVPuXf1b4+4/iVFWGS/g4SY=; X-Original-Message-ID: <522314.41091.qm@web62503.mail.re1.yahoo.com> X-YMail-OSG: LuTWspsVM1ml87za0pWUte5FgxUr69Tf93dPolJLbyMVj58nBBl9Kh5schkM_qC204jJz4zDwZ6mzZ24mTKBDlv5nTYiPY7tdFZdDKaOW6z0vTNBIwYtjaGoYVedjKBr6O6Lw0rPaCGXAnP.ZLAdKO8F6cwxxRJwwQnw_NofI7eCkwrbJL3F8zJiK5NVVBQPGvQpFxq.gIz08ulB2KNxsDPa1EcsQEUMov6Nnbl8G5l6hcFxOv7NNPds1uSsnfEQvuiqFgU9Hq31CbqSMVE5.68XxTNZA5hOxfbyThN_MAiI7pnXrRNvYS3L0rFlfjZLf1lF8M_qCz8ulyWGwmvaeOK_3byNUIqDn4TwBD4RZ1LL9zJe Received: from [97.104.160.94] by web62503.mail.re1.yahoo.com via HTTP; Fri, 19 Jun 2009 12:20:27 PDT X-Mailer: YahooMailRC/1357.18 YahooMailWebService/0.7.289.15 References: X-Original-Date: Fri, 19 Jun 2009 12:20:27 -0700 (PDT) From: Charlie Kohler Subject: Re: [LML] Boost pump X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1191576239-1245439227=:41091" --0-1191576239-1245439227=:41091 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Here's the skinny--=0Athe fuel system pressures are set with the electric f= uel pump off. When you turn on the electric fuel pump you upset the balance= of fuel pressure to the rich side. Not much.=0AYou can run the pump on if = you like--just set the high fuel flow to 41.7-- 43.4 gallons per hour at 38= inches and 2700 rpm with the electric pump on. Now you're good to go "pump= on" all the time.=0ASeveral manufacturers recommend that operation.=0AHere= 's an experiment.=0AWith engine at max power in climb-- check and adjust mi= xture control to 41.7 plus. Pump on.=0ANow turn off the electric low pump. = Check for a change in fuel flow.=0AOr if you're lucky enough to have metere= d fuel pressure gauge--use that.=0AIf it drops below 41.7-- I would not mak= e the adjustments to accommodate pump low for takeoff. =0ABecause if the pu= mp or electrical power to it does fail-- you can damage the engine.=0A=A0= =0ACharlie K.=0A=0ASee me on the web at =0Awww.Lancair-IV.com=0A=0A=0A=0A= =0A=0A________________________________=0AFrom: Art Bertolina =0ATo: lml@lancaironline.net=0ASent: Friday, June 19, 2009 12= :21:57 PM=0ASubject: [LML] Boost pump=0A=0A=0ADan=0AI use low boost above 1= 0,000ft, high boost when I switch=0Afuel tanks. =0AArt --0-1191576239-1245439227=:41091 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
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Here's the skinny--

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t= he fuel system pressures are set with the electric fuel pump off. When you = turn on the electric fuel pump you upset the balance of fuel pressure to th= e rich side. Not much.

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You can run the pump on if you like--just s= et the high fuel flow to 41.7-- 43.4 gallons per hour at 38 inches and 2700= rpm with the electric pump on. Now you're good to go "pump on" all the tim= e.

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Several manufacturers recommend that operation.

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Here's= an experiment.

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With engine at max power in climb-- check and adju= st mixture control to 41.7 plus. Pump on.

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Now turn off the electri= c low pump. Check for a change in fuel flow.

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Or if you're lucky en= ough to have metered fuel pressure gauge--use that.

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If it drops be= low 41.7-- I would not make the adjustments to accommodate pump low for tak= eoff.

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Because if the pump or electrical power to it does fail-- y= ou can damage the engine.


 
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Charlie K.=0A
 
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See me on the web at
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=0AFrom: Art Bertolina <artbertolina@earthlink.net>
To: lml@lancaironline.net
= Sent: Friday, June 19, 2009= 12:21:57 PM
Subject: [L= ML] Boost pump

=0A=0A=0A
Dan
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I use low bo= ost above 10,000ft, high boost when I switch
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fuel tanks.
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Art
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