X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Thu, 21 Sep 2006 20:36:36 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1414031 for lml@lancaironline.net; Thu, 21 Sep 2006 18:52:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m25.mx.aol.com (mail_out_v38_r7.6.) id q.523.76598a0 (30737) for ; Thu, 21 Sep 2006 18:51:32 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <523.76598a0.32447174@aol.com> X-Original-Date: Thu, 21 Sep 2006 18:51:32 EDT Subject: Re: [LML] Boost pump switching X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1158879092" X-Mailer: 9.0 Security Edition for Windows sub 5330 X-Spam-Flag: NO -------------------------------1158879092 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/21/2006 5:39:02 P.M. Central Standard Time, aadamson@highrf.com writes: So.... (don't ya just love it when an email starts this way :) ) I've seen most IO-550's with 2 boost pump switches. I'll assume they are used as follows. 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. .......................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. Alan, So, think about what you should be doing before a hot start - circulating cool fuel thru the heat soaked engine pump, throttle body and back thru the return line. Which switch to twitch begs the cool fuel tool query. Someone who has suffered the vapors will surely answer................. Grayhawk -------------------------------1158879092 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 9/21/2006 5:39:02 P.M. Central Standard Time,=20 aadamson@highrf.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>So....=20 (don't ya just love it when an email starts this way :) )

I've seen= =20 most IO-550's with 2 boost pump switches. I'll assume they are
us= ed=20 as follows.

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

High Boost - Prime at=20 startup.

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

Alan,

So, think about what you should be doing before a hot start - circulati= ng=20 cool fuel thru the heat soaked engine pump, throttle body and back thru the=20 return line. Which switch to twitch begs the cool fuel tool query.&nbs= p;=20 Someone who has suffered the vapors will surely answer.................

Grayhawk

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