Return-Path: Received: from [65.54.169.57] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 617380 for flyrotary@lancaironline.net; Sat, 22 Jan 2005 10:40:03 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.57; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 22 Jan 2005 07:39:01 -0800 Message-ID: Received: from 4.174.5.11 by BAY3-DAV27.phx.gbl with DAV; Sat, 22 Jan 2005 15:38:27 +0000 X-Originating-IP: [4.174.5.11] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fuel Injector Sizing Date: Sat, 22 Jan 2005 10:38:27 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01C5006E.81E2E3A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0009.2900 Seal-Send-Time: Sat, 22 Jan 2005 10:38:27 -0500 X-OriginalArrivalTime: 22 Jan 2005 15:39:01.0071 (UTC) FILETIME=[7EB46DF0:01C50098] This is a multi-part message in MIME format. ------=_NextPart_000_003F_01C5006E.81E2E3A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageYes, the [gauge] pressure measured at the fuel rail should vary = with manifold pressure. Things will still work if this doesn't happen = but the EC2 may run out of range in Mode 1 or 9 and it definitely makes = tuning the EC2 much more difficult if the regulator isn't responding to = manifold pressure changes. This is especially true at the low end of = MAP range. Tracy You certainly could be right about that, Rusty. My understanding was = to expect the fuel pressure to vary to compensate for the different = manifold pressure. But, there is no indication on my gauge and this is = the second pressure regulator (but, of the same make Hmmm) that I have = had. It does regulate (else my fuel pressure would be much higher) but = apparently does not compensate for manifold pressure based on what I am = hearing. But, as you indicated, If there is any operational problem = associated with it, I have not encountered it (or recognized it as = such). It is one of the smaller ones and it could be that it is dumping = all the fuel it can at 40-43 psi and there is not sufficient return flow = capacity to compensate for the variations in manifold pressure. I = suspect that if I had a turbo where the manifold pressure varied = considerably that the lack of such compensation might be more = detrimental to engine performance (and life). Just speculation of = course. Ed A ------=_NextPart_000_003F_01C5006E.81E2E3A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Yes, the [gauge] pressure measured at the fuel rail should vary = with=20 manifold pressure.  Things will still work if this doesn't happen = but the=20 EC2 may run out of range in Mode 1 or 9 and it definitely makes = tuning the=20 EC2 much more difficult if the regulator isn't responding to manifold = pressure=20 changes.  This is especially true at the low end of MAP = range.
 
Tracy

You certainly could be right about = that,=20 Rusty.  My understanding was to expect the fuel pressure to vary = to=20 compensate for the different manifold pressure.  But, there is no = indication on my gauge and this is the second pressure regulator (but, = of the=20 same make Hmmm) that I have had.  It does regulate (else my fuel = pressure=20 would be much higher) but apparently does not compensate for manifold = pressure=20 based on what I am hearing.
 
  But, as you indicated, If = there is any=20 operational problem associated with it, I have not encountered it = (or=20 recognized it as such).  It is one of the smaller ones and it = could be=20 that it is dumping all the fuel it can at 40-43 psi and there is not=20 sufficient return flow capacity to compensate for the variations in = manifold=20 pressure.  I suspect that if I had a turbo where the manifold = pressure=20 varied considerably that the lack of such compensation might be more=20 detrimental to engine performance (and life).   Just = speculation of=20 course.
 
Ed A
 
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