Return-Path: Received: from fed1rmmtao07.cox.net ([68.230.241.32] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 617407 for flyrotary@lancaironline.net; Sat, 22 Jan 2005 11:17:20 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.32; envelope-from=daveleonard@cox.net Received: from davidandanne ([68.111.224.107]) by fed1rmmtao07.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with SMTP id <20050122161651.OBGG21886.fed1rmmtao07.cox.net@davidandanne> for ; Sat, 22 Jan 2005 11:16:51 -0500 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Manifold-Reference Fuel Pressure was [FlyRotary]Re: Fuel Injector Sizing Date: Sat, 22 Jan 2005 08:18:59 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01C5005B.066E4100" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_002C_01C5005B.066E4100 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Re: [FlyRotary] Re: Fuel Injector SizingMine definitely varies with manifold pressure. My fuel pressure at idle is about 32 psi. while it approaches 50psi at WOT. If yours is not doing so, something is wrong. It is not directly a reference to "outside" pressure, but manifold pressure (whatever is showing on my MAP gauge). Dave Leonard Ain't that what they are supposed to do ? Keep it steady as outside pressure diminishes ? Doesn't your gauge suffer from the same diminishing outside pressure as altitude increases; therefore, wouldn't they stay constant, if working properly ? 'Splain to us simple minded, of which I may be the only one. jofarr ----- Original Message ----- From: Ed Anderson I agree with your statement, Buly. Ideally if the pressure differential between fuel rail and manifold is kept constant by use of a manifold reference then that would imply that the fuel pressure should vary to compensate for different manifold pressure. However, my fuel pressure is rock steady and this is the second manifold-referenced fuel pressure regulator I have used with no difference. So either my manifold-reference fuel pressure regulator isn't or I am misunderstanding what they are suppose to do. But, that is my experience. How about others of you flying what is your experience with fuel pressure??? Does it vary? The variance corresponds to what?? ------=_NextPart_000_002C_01C5005B.066E4100 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: Fuel Injector Sizing
Mine=20 definitely varies with manifold pressure.  My fuel pressure at idle = is=20 about 32 psi.  while it approaches 50psi at WOT.  If yours is = not=20 doing so, something is wrong.  It is not directly a reference to = "outside"=20 pressure, but manifold pressure (whatever is showing on my MAP=20 gauge).
 
Dave=20 Leonard
 
Ain't that what they are supposed to = do ? =20 Keep it steady as outside pressure diminishes ? Doesn't your gauge = suffer from=20 the same diminishing outside pressure as altitude increases; = therefore,=20 wouldn't they stay constant, if working properly ? 'Splain to us = simple=20 minded, of which I may be the only one.
jofarr
----- Original Message ----- = From: Ed=20 Anderson
 
I agree with your statement, = Buly. =20 Ideally if the pressure differential between fuel rail and = manifold is=20 kept constant by use of a manifold reference then that would imply = that the=20 fuel pressure should vary to compensate for different manifold=20 pressure.  However, my fuel pressure is rock steady and this is = the=20 second manifold-referenced fuel pressure regulator I have used with = no=20 difference.  So either my manifold-reference fuel pressure = regulator=20 isn't or I am misunderstanding what they are suppose to = do.
 
But, that is my experience.  = How about=20 others of you flying what is your experience with fuel = pressure??? =20 Does it vary? The variance corresponds to what??
 
 
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