Return-Path: Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 618224 for flyrotary@lancaironline.net; Sun, 23 Jan 2005 08:32:28 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=atlasyts@bellsouth.net Received: from [65.8.117.68] by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050123133158.UYKS1992.imf17aec.mail.bellsouth.net@[65.8.117.68]> for ; Sun, 23 Jan 2005 08:31:58 -0500 User-Agent: Microsoft-Entourage/10.1.4.030702.0 Date: Sun, 23 Jan 2005 08:32:17 -0500 Subject: Re: [FlyRotary] Re: Ah Ha! Pressure Regulator Problem? From: Bulent Aliev To: Rotary motors in aircraft Message-ID: In-Reply-To: Mime-version: 1.0 Content-type: multipart/mixed; boundary="B_3189313942_403678" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3189313942_403678 Content-type: multipart/alternative; boundary="B_3189313942_426255" --B_3189313942_426255 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable 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 manif= old > referenced fuel pressure regulator should maintain a constant pressure > differential between the pressure in the fuel rail and that in the manifo= ld > therefore insuring that the same amount of fuel in injected for the same > injector-on time duration (pulse). So as you increased altitude(and decr= eased > manifold pressure at WOT) I would expect to see the fuel pressure drop > correspondingly to maintain the differential. Or if turbocharged, I woul= d > 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 millisec= ond > of injector on time than at higher manifold pressure. > A different make of pressure regulator is likely the only way I will kno= w for > certain. > =20 > Ed A > =20 > =20 Hi Ed, here is the one I=B9m using from Summit Racing Part#AEI-13109. Bulent --B_3189313942_426255 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Re: [FlyRotary] Re: Ah Ha! Pressure Regulator Problem? On 1/23/05 8:16 AM, &qu= ot;Ed Anderson" <eanderson@carolina.rr.com> wrote:

Some excellent observations, Barry.
 
Regarding the workings at altitude - there would certainly be a different f= uel flow required at WOT at 4000 vs WOT at 12000 assuming NA engine.  A= manifold referenced fuel pressure regulator should maintain a constant pres= sure differential between the pressure in the fuel rail and that in the mani= fold therefore insuring that the same amount of fuel in injected for the sam= e 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.
 
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 pres= sure 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.
 
Ed A
 
 
Hi Ed, here is the one I’m using from Summit Racing Part#AEI-13109. Bulent
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