Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 617324 for flyrotary@lancaironline.net; Sat, 22 Jan 2005 08:51:03 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.72; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050122135034.VZOJ2032.imf24aec.mail.bellsouth.net@rd> for ; Sat, 22 Jan 2005 08:50:34 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Fuel Injector Sizing Date: Sat, 22 Jan 2005 07:50:54 -0600 Message-ID: <002801c50089$64360ab0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0029_01C50057.199B9AB0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0029_01C50057.199B9AB0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Actually, I have a manifold referenced pressure regulator (which if I understand the concept) attempts to keep the pressure differential = between the fuel side and manifold side of the injector constant. However, = Varying engine manifold pressure (varying throttle opening) does not appear to = have any affect on my fuel pressure. It sits rock steady at 40 psi with one = pump and goes up to 43 psi with both running regardless of throttle position. = =20 =20 Hi Ed,=20 =20 Sounds like your regulator isn't working like it's supposed to, though I guess it isn't causing you any problems. A simple test would be to run = the pump with the engine off and note the fuel pressure, then check it again = at idle. If you really want to get fancy, and have one of those Mity-Vac pumps, you can just vary the pressure signal to the regulator with the engine off. My pressure definitely changes. =20 =20 Cheers, Rusty (wonder if Tommy got his new regulator working yet)=20 ------=_NextPart_000_0029_01C50057.199B9AB0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Actually, I have a manifold = referenced=20 pressure regulator (which if I understand the concept) attempts to = keep the=20 pressure differential between the fuel side and manifold side of the = injector=20 constant. However, Varying engine manifold pressure (varying = throttle=20 opening) does not appear to have any affect on my fuel pressure.  = It sits=20 rock steady at 40 psi with one pump and goes up to 43 psi with both = running=20 regardless of throttle position.   
 
Hi Ed, 
 
Sounds like your regulator isn't working like = it's supposed=20 to, though I guess it isn't causing you any problems.  A simple = test would=20 be to run the pump with the engine off and note the fuel pressure, then = check it=20 again at idle.  If you really want to get fancy, and have one of = those=20 Mity-Vac pumps, you can just vary the pressure signal to the regulator = with the=20 engine off.  My pressure definitely=20 changes.  
 
Cheers,
Rusty (wonder if Tommy got his new regulator = working=20 yet) 
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