Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 618004 for flyrotary@lancaironline.net; Sat, 22 Jan 2005 23:15:21 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.rr.com [24.74.185.127]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j0N4ElKk027111 for ; Sat, 22 Jan 2005 23:14:48 -0500 (EST) Message-ID: <000801c50102$61cfd520$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fuel Injector Sizing Date: Sat, 22 Jan 2005 23:16:58 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C500D8.7890D220" 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_0005_01C500D8.7890D220 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: Fuel Injector SizingThanks Bulent, Yes, nice to have it confirmed. That was my understanding of how it = should work, but after two that did not work that way but did not cause = any operational difficulty - I went on to other problems {:>). So I would expect to see your fuel pressure around 37 psi with either = the engine stopped or WOT. Any RPM between those two extremes should = result in less than 37 psi on the gauge with the minimum psi during high = speed idle (lowest manifold pressure point). =20 =20 It would appear that I need to look for a new fuel pressure regulator. Ed ----- Original Message -----=20 From: Bulent Aliev=20 To: Rotary motors in aircraft=20 Sent: Saturday, January 22, 2005 11:00 PM Subject: [FlyRotary] Re: Fuel Injector Sizing On 1/22/05 9:10 AM, "Ed Anderson" wrote: 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 Hi Ed, I just came from the hangar. My FP is set at 37psi without the = engine running. I noticed at 2300 rpm the FP was around 20 psi. So it = varies with the MP. Bulent ------=_NextPart_000_0005_01C500D8.7890D220 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: Fuel Injector Sizing
Thanks Bulent,
 
Yes, nice to have it = confirmed. That was my=20 understanding of how it should work, but after two that did not work = that way=20 but did not cause any operational difficulty - I went on to other = problems=20 {:>).
 
So I would expect to see your fuel = pressure around=20 37 psi with either the engine stopped or WOT.  Any RPM between = those two=20 extremes should result in less than 37 psi on the gauge with the minimum = psi during high speed idle (lowest manifold pressure point). =20
 
It would appear that  I need to = look for a new=20 fuel pressure regulator.
 
Ed
----- Original Message -----
From:=20 Bulent=20 Aliev
Sent: Saturday, January 22, = 2005 11:00=20 PM
Subject: [FlyRotary] Re: Fuel = Injector=20 Sizing

On = 1/22/05=20 9:10 AM, "Ed Anderson" <eanderson@carolina.rr.com&g= t;=20 wrote:
You = certainly=20 could be right about that, Rusty.  My understanding was to = expect the=20 fuel pressure to vary to compensate for the different manifold = pressure.=20  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=20 does regulate (else my fuel pressure would be much higher) but = apparently=20 does not compensate for manifold pressure based on what I am=20 hearing.

 But,=20 as you indicated, If there is any operational problem associated = with it, I=20 have not encountered it (or recognized it as such).  It is one = of the=20 smaller ones and it could be that it is dumping all the fuel it can = at 40-43=20 psi and there is not sufficient return flow capacity to compensate = for the=20 variations in manifold pressure.  I suspect that if I had a = turbo where=20 the manifold pressure varied considerably that the lack of such = compensation=20 might be more detrimental to engine performance (and life). =   Just=20 speculation of course.

Ed A

Hi Ed, I just came from = the hangar.=20 My FP is set at 37psi without the engine running. I noticed at 2300 = rpm the FP=20 was around 20 psi. So it varies with the MP.
Bulent=20 ------=_NextPart_000_0005_01C500D8.7890D220--