X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Fri, 22 Sep 2006 14:44:56 -0400 Message-ID: X-Original-Return-Path: Received: from bay0-omc3-s29.bay0.hotmail.com ([65.54.246.229] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1415232 for lml@lancaironline.net; Fri, 22 Sep 2006 11:06:26 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.229; envelope-from=joscales98@hotmail.com Received: from hotmail.com ([65.54.169.85]) by bay0-omc3-s29.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 22 Sep 2006 08:05:43 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 22 Sep 2006 08:05:43 -0700 X-Original-Message-ID: Received: from 24.51.120.147 by BAY114-DAV13.phx.gbl with DAV; Fri, 22 Sep 2006 15:05:41 +0000 X-Originating-IP: [24.51.120.147] X-Originating-Email: [joscales98@hotmail.com] X-Sender: joscales98@hotmail.com From: "Jim Scales" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Boost pump switching X-Original-Date: Fri, 22 Sep 2006 10:05:42 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0024_01C6DE2E.AA165510" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.20.0029.3000 Seal-Send-Time: Fri, 22 Sep 2006 10:05:43 -0500 X-OriginalArrivalTime: 22 Sep 2006 15:05:43.0316 (UTC) FILETIME=[931B3540:01C6DE58] X-Original-Return-Path: joscales98@hotmail.com This is a multi-part message in MIME format. ------=_NextPart_000_0024_01C6DE2E.AA165510 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My ES has a momentary prime switch along with a low and high boost = switch. I use the high boost to pressurize the fuel system before starting. I = use the prime position for a couple of seconds before doing a cold = start. I do not use it on hot starts. I use low boost to clear the injector lines of any vapor when doing a = hot start. I turn it off for the start. After the engine starts I turn = the low boost back on for about 30 seconds to prevent vaporization. = Then the pump is off for all operations.=20 (Early on I would use the high boost pump to cool the fuel lines for a = minute or so before a hot start. Eventually, I found that I could get = better results by setting mixture full rich and then using low boost to = clear and pressurize the injector lines. I can actually hear when the = vapor clears and the lines develop pressure. The pump begins to labor = and the sound gets deeper. Hot starts are no problem.) I have experienced a loss of engine driven fuel pump while on the = ground. Low boost kept the engine running but in no way could the plane = have been flown. Way too rich. I once used the low boost in flight when trying out tank switching = procedures. Low boost made the engine run extremely rough. I have = trouble thinking there is a ever a time to run the pump in normal flight = operations. My $.02. No flaming please. This stuff works really well for me. =20 Jim Scales N98AF Angel's Playmate 800 hours Low Boost - switched on at or above 10K feet and run for the duration = of the flight at that level to provide added purging of vapors or bubbles = that might exist in the lines High Boost - Prime at startup. Ok, now, I've also heard that you use High Boost any time you loose an engine driven fuel pump. Will low boost suffice? I've found a couple of switches that I could replace the single with = that will allow switching to low and locking out high unless placed there, = or I could go to an ON-ON-ON type without the momentary. So, could you splain to me, what the various boost modes are or if = there is another compromise that I haven't thought of with one switch. ------=_NextPart_000_0024_01C6DE2E.AA165510 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
My ES has a momentary prime switch along with a low and high boost=20 switch.
 
I use the high boost to pressurize the fuel system before = starting.  I=20 use the prime position for a couple of seconds before doing a cold=20 start.  I do not use it on hot starts.
 
I use low boost to clear the injector lines of any vapor when doing = a hot=20 start. I turn it off for the start. After the engine starts I = turn the=20 low boost back on for about 30 seconds to prevent vaporization.  = Then the=20 pump is off for all operations.
 
(Early on I would use the high boost pump to cool the fuel lines = for a=20 minute or so before a hot start.  Eventually, I found that I could = get=20 better results by setting mixture full rich and then using low boost to = clear=20 and pressurize the injector lines.  I can actually hear when the = vapor=20 clears and the lines develop pressure.  The pump begins to labor = and the=20 sound gets deeper.  Hot starts are no problem.)
 
I have experienced a loss of engine driven fuel pump while on the=20 ground.  Low boost kept the engine running but in no way could the = plane=20 have been flown.  Way too rich.
 
I once used the low boost in flight when trying out tank = switching=20 procedures.  Low boost made the engine run extremely rough.  I = have=20 trouble thinking there is a ever a time to run the pump in normal flight = operations.
 
My $.02.  No flaming please.  This stuff works really = well for=20 me. 
 
Jim Scales
N98AF
Angel's Playmate
800 hours

Low=20 Boost - switched on at or above 10K feet and run for the duration of=20 the
flight at that level to provide added purging of vapors or = bubbles=20 that
might exist in the lines

High Boost - Prime at=20 startup.

Ok, now, I've also heard that you use High Boost any = time you=20 loose an
engine driven fuel pump.  Will low boost=20 suffice?


I've found a couple of switches that I could = replace the=20 single with that
will allow switching to low and locking out high = unless=20 placed there, or I
could go to an ON-ON-ON type without the=20 momentary.

So, could you splain to me, what the various boost = modes are=20 or if there is
another compromise that I haven't thought of with = one=20 switch.

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