Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 618859 for flyrotary@lancaironline.net; Sun, 23 Jan 2005 21:27:49 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.rr.com [24.74.185.127]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j0O2RGkd020793 for ; Sun, 23 Jan 2005 21:27:17 -0500 (EST) Message-ID: <003001c501bc$88655970$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Ah Ha! Pressure Regulator Problem? Date: Sun, 23 Jan 2005 21:29:29 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002D_01C50192.9F53A800" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_002D_01C50192.9F53A800 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: WRJJRS@aol.com=20 To: Rotary motors in aircraft=20 Sent: Sunday, January 23, 2005 8:53 PM Subject: [FlyRotary] Re: Ah Ha! Pressure Regulator Problem? In a message dated 1/23/2005 5:05:26 AM Pacific Standard Time, = eanderson@carolina.rr.com writes: Hey Bill, =20 I appreciate all the help I can get - different insight/experience = is what makes sharing information on this list so useful. It certainly = seems that the return capability of this regulator could be less than = required to properly regulate pressure referenced to manifold. I had = assumed that since MSD advertised their High pressure pump and regulator = together that they would work together. And the regulator may indeed = increase fuel pressure/flow if presented with boost pressure (above = ambient) - just don't know since I don't have a turbo. =20 Thanks again =20 Ed A Ed, There are two parts to this equation. First: Does the regulator = flow enough by itself. Second: and almost as important is the plumbing = itself. Some people will use very small return plumbing. That plumbing = can restrict flow, keeping the fuel presure high. Another thing for the = new people to remember, be sure your return switches with your tank = valve. There have been accidents where the return flow wasn't switched = and the tank ran dry. (Always on final of course) Bill Jepson=20 I agree Bill, I used the same -6 line for return as for main flow, so = that shouldn't be a problem. My return line is to a small (1 pint) = header tank on the firewall, so no return line to main tanks to switch. = Has worked well for 260+ flying hours - but, a change I would make would = be to put the header in the wing root or someplace other than under the = cowl due to heat and possibility of vapor lock. The combination of = blast air tube to the fuel components and a boost pump (to pressurize = the header if needed) keeps that at bay. Ed A ------=_NextPart_000_002D_01C50192.9F53A800 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 WRJJRS@aol.com
Sent: Sunday, January 23, 2005 = 8:53=20 PM
Subject: [FlyRotary] Re: Ah Ha! = Pressure=20 Regulator Problem?

In a message dated 1/23/2005 = 5:05:26 AM Pacific=20 Standard Time, eanderson@carolina.rr.com=20 writes:

Hey Bill,
 
I appreciate all = the help I=20 can get - different insight/experience is what makes sharing = information on=20 this list so useful.  It certainly seems that the return = capability of=20 this regulator could be less than required to properly regulate = pressure=20 referenced to manifold.  I had assumed that since MSD = advertised their=20 High pressure pump and regulator together that they would work=20 together.  And the regulator may indeed increase fuel = pressure/flow if=20 presented with boost pressure (above ambient) - just don't know = since I=20 don't have a turbo.
 
Thanks = again
  =
Ed A


Ed,=20 There are two parts to this equation. First: Does the regulator flow = enough by=20 itself. Second: and almost as important is the plumbing itself. Some = people=20 will use very small return plumbing. That plumbing can restrict flow, = keeping=20 the fuel presure high. Another thing for the new people to remember, = be sure=20 your return switches with your tank valve. There have been accidents = where the=20 return flow wasn't switched and the tank ran dry. (Always on final of=20 course)
Bill Jepson
 
I agree Bill,  I used the same -6 line for = return as=20 for main flow, so that shouldn't be a problem.  My return line is = to a=20 small (1 pint) header tank on the firewall, so no return line to main = tanks to=20 switch.  Has worked well for 260+ flying hours - but, a change I = would=20 make would be to put the header in the wing root or someplace other = than under=20 the cowl due to heat and possibility of vapor lock.  The = combination of=20 blast air tube to the fuel components and a boost pump (to pressurize = the=20 header if needed) keeps that at bay.
 
Ed = A
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