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 618222 for flyrotary@lancaironline.net; Sun, 23 Jan 2005 08:35:08 -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 <20050123133438.UZBD1992.imf17aec.mail.bellsouth.net@[65.8.117.68]> for ; Sun, 23 Jan 2005 08:34:38 -0500 User-Agent: Microsoft-Entourage/10.1.4.030702.0 Date: Sun, 23 Jan 2005 08:34:59 -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/alternative; boundary="B_3189314102_444523" > 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_3189314102_444523 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable On 1/23/05 8:32 AM, "Bulent Aliev" wrote: > On 1/23/05 8:16 AM, "Ed Anderson" wrote: >=20 >> Some excellent observations, Barry. >> =20 >> Regarding the workings at altitude - there would certainly be a differen= t >> 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(an= d >> decreased manifold pressure at WOT) I would expect to see the fuel press= ure >> 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 millise= cond >> of injector on time than at higher manifold pressure. >> A different make of pressure regulator is likely the only way I will kn= ow >> for certain. >> =20 >> Ed A >> =20 >> =20 > Hi Ed, here is the one I=B9m using from Summit Racing Part#AEI-13109. > Bulent BTW, the regulator comes without the AN fittings. Don=B9t buy their Aeromotiv= e brand. VERY expensive. Get the generic Summit Racing ones. Bulent --B_3189314102_444523 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 8:32 AM, &qu= ot;Bulent Aliev" <atlasyts@bellsouth.net> wrote:

On 1/23/05 8:16 AM, "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

BTW, the regulator comes without the AN fittings. Don’t buy their Aer= omotive brand. VERY expensive. Get the generic Summit Racing ones.
Bulent --B_3189314102_444523--