Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 617389 for flyrotary@lancaironline.net; Sat, 22 Jan 2005 11:09:47 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.rr.com [24.74.185.127]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j0MG9CCi009344 for ; Sat, 22 Jan 2005 11:09:13 -0500 (EST) Message-ID: <001b01c5009d$046f84d0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fuel Injector Sizing Date: Sat, 22 Jan 2005 11:11:23 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0018_01C50073.1B677050" 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_0018_01C50073.1B677050 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageThanks for the confirmation, Tracy. That was my understanding - = which indicates my manifold-referenced pressure regulator - Ain't. = Could be why I find the default fuel MAP setting a tad rich at lower = manifold pressure (idle). Ed A ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Saturday, January 22, 2005 10:38 AM Subject: [FlyRotary] Re: Fuel Injector Sizing Yes, 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_0018_01C50073.1B677050 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Thanks for the confirmation, Tracy.  That = was my=20 understanding - which indicates my manifold-referenced pressure = regulator -=20 Ain't.  Could be why I find the default fuel MAP setting a tad rich = at=20 lower manifold pressure (idle).
 
Ed A
----- Original Message -----
From:=20 Tracy = Crook
Sent: Saturday, January 22, = 2005 10:38=20 AM
Subject: [FlyRotary] Re: Fuel = Injector=20 Sizing

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=20 the EC2 much more difficult if the regulator isn't responding to = manifold=20 pressure changes.  This is especially true at the low end of MAP=20 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=20 indication on my gauge and this is the second pressure regulator = (but, of=20 the same make Hmmm) that I have had.  It does regulate (else my = fuel=20 pressure would be much higher) but apparently does not compensate = for=20 manifold pressure 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 = 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 = detrimental to engine performance (and life).   Just = speculation=20 of course.
 
Ed A
 
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