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 618245 for flyrotary@lancaironline.net; Sun, 23 Jan 2005 09:30:24 -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 j0NETpkd017884 for ; Sun, 23 Jan 2005 09:29:52 -0500 (EST) Message-ID: <002901c50158$4ef16580$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 09:32:03 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01C5012E.65E22510" 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_0026_01C5012E.65E22510 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: Ah Ha! Pressure Regulator Problem? ----- Original Message -----=20 From: Bulent Aliev=20 To: Rotary motors in aircraft=20 Sent: Sunday, January 23, 2005 8:32 AM Subject: [FlyRotary] Re: Ah Ha! Pressure Regulator Problem? On 1/23/05 8:16 AM, "Ed Anderson" wrote: Some excellent observations, Barry. =20 Regarding the workings at altitude - there would certainly be a = different fuel flow required at WOT at 4000 vs WOT at 12000 assuming NA = engine. A manifold referenced fuel pressure regulator should maintain a = constant pressure differential between the pressure in the fuel rail and = that in the manifold therefore insuring that the same amount of fuel in = injected for the same injector-on time duration (pulse). So as you = increased altitude(and decreased manifold pressure at WOT) I would = expect to see the fuel pressure drop correspondingly to maintain the = differential. Or if turbocharged, I would expect to see the fuel = pressure increase as the boost goes up. =20 My fuel map has always been a bit rich at the lower rpm range = (idle), so it could be that when manifold pressure is low (such as at = idle) that the pressure differential is much larger meaning more fuel = flows per millisecond of injector on time than at higher manifold = pressure. A different make of pressure regulator is likely the only way I = will know for certain. =20 Ed A =20 =20 Hi Ed, here is the one I'm using from Summit Racing Part#AEI-13109.=20 Bulent You read my mind, Bulent. Was just going to ask you what model you = used. Thanks Ed A ------=_NextPart_000_0026_01C5012E.65E22510 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: Ah Ha! Pressure Regulator = Problem?
 
----- Original Message -----
From:=20 Bulent=20 Aliev
Sent: Sunday, January 23, 2005 = 8:32=20 AM
Subject: [FlyRotary] Re: Ah Ha! = Pressure=20 Regulator Problem?

On = 1/23/05=20 8:16 AM, "Ed Anderson" <eanderson@carolina.rr.com&g= t;=20 wrote:
Some = excellent=20 observations, Barry.
 
Regarding the workings at altitude = - there=20 would certainly be a different fuel flow required at WOT at 4000 vs = WOT at=20 12000 assuming NA engine.  A manifold referenced fuel pressure=20 regulator should maintain a constant pressure differential between = the=20 pressure in the fuel rail and that in the manifold therefore = insuring that=20 the same amount of fuel in injected for the same injector-on time = duration=20 (pulse).  So as you increased altitude(and decreased manifold = pressure=20 at WOT) I would expect to see the fuel pressure drop correspondingly = to=20 maintain the differential.  Or if turbocharged, I would expect = to see=20 the fuel pressure increase as the boost goes up.
 
My = fuel map=20 has always been a bit rich at the lower rpm range (idle), so it = could be=20 that when manifold pressure is low (such as at idle) that the = pressure=20 differential is much larger meaning more fuel flows per millisecond = of=20 injector on time than at higher manifold pressure.
A =  different make=20 of pressure regulator is likely the only way I will know for=20 certain.
 
Ed=20 A
 
 
Hi Ed, here is the one I=92m using from = Summit Racing=20 Part#AEI-13109.
Bulent

 You read my mind, Bulent.  = Was just=20 going to ask you what model you used.
 
Thanks
 
Ed = A
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