X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.25.9.101] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2082157 for flyrotary@lancaironline.net; Sun, 03 Jun 2007 20:18:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-02.southeast.rr.com (8.13.6/8.13.6) with SMTP id l540HYGm011981 for ; Sun, 3 Jun 2007 20:17:34 -0400 (EDT) Message-ID: <000901c7a63e$362f2130$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: MAP Referenced Fuel Pressure Regulator Date: Sun, 3 Jun 2007 20:20:52 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C7A61C.AEC7C010" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C7A61C.AEC7C010 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mark, When you say the EM2 doesn't like it that high - isn't that = because of a warning limit you have set in it? Or have left it at a = default setting? I agree that if the fuel pressure should suddenly = start showing higher readings it could possibly indicate something like = blockage in fuel return from the pressure regulator or a filter getting = plugged up, etc. So its nice to have a warning on the high end. But, I find it difficult to believe that Tracy hard coded in a pressure = of 41 psi. But 41 psi at high power setting and 35 at idle also seem = quite in the ball park. Ed ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Sunday, June 03, 2007 8:02 PM Subject: [FlyRotary] Re: MAP Referenced Fuel Pressure Regulator Ed,=20 Yes, 41 sounds reasonable, except the EM-2 doesn't like it that high. = It flashes until the engine is started and the fp drops. I adjusted my = static fuel pressure up to 41 psi today. That initial setting now gives = approx. 34psi at idle. FWIW=20 Thanks, Mark =20 =20 On 6/3/07, Ed Anderson wrote:=20 Hi Mark, Yes, I can tell you, but doubt it will be too meaningful.=20 My regulator does have a reference to the manifold - but, this = apparently only causes the pressure regulator to react to positive = (boost) manifold pressure - in otherwords while under boost pressures = the regulator will increase fuel flow to the injectors by increasing = pressure. It apparently does not regulate the fuel pressure at normal = manifold pressure ranges. =20 But, in any case my pressure regulator keeps the fuel pressure at 41 = psi with one pump on and it increases to 43 with both pumps on. = Again,changing manifold pressure does not affect my fuel pressure.=20 I intend to swap it out (someday) for one that is a true manifold = referenced regulator - but, sigh, just always seems to be something else = to do - and it has worked for me for 10 years. But, I could probably = get an even smoother idle if I swapped it out.=20 I would say 41-43 psi would be a reasonable setting. =20 Ed ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Saturday, June 02, 2007 8:25 PM Subject: [FlyRotary] MAP Referenced Fuel Pressure Regulator =20 Ed, Can you tell me what pressures you're seeing on your fuel pressure = at idle, mid-range, and WOT? Also, please verify that you set the fuel = pressure with engine stopped and fuel pumps ON. What should the fuel = initial fuel pressure be set at for our purposes? =20 Thanks, Mark S. ------=_NextPart_000_0006_01C7A61C.AEC7C010 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Mark, When you say the EM2 doesn't like it that = high -=20 isn't that because of a warning limit you have set in it?  Or have = left it=20 at a default setting?    I agree that if the fuel = pressure should=20 suddenly start showing higher readings it could possibly indicate = something like=20 blockage in fuel return from the pressure regulator or a filter getting = plugged=20 up, etc. So its nice to have a warning on the high end.
 
But, I find it difficult to believe that Tracy = hard coded=20 in a pressure of 41 psi.   But 41 psi at high power setting = and 35 at=20 idle also seem quite in the ball park.
 
Ed
----- Original Message -----
From:=20 Mark = Steitle=20
Sent: Sunday, June 03, 2007 = 8:02 PM
Subject: [FlyRotary] Re: MAP = Referenced=20 Fuel Pressure Regulator

Ed,
Yes, 41 sounds reasonable, except the EM-2 doesn't like it that=20 high.  It flashes until the engine is started and the fp = drops.  I=20 adjusted my static fuel pressure up to 41 psi today.  That = initial=20 setting now gives approx. 34psi at idle.  FWIW
 
Thanks,
Mark   

 
On 6/3/07, Ed=20 Anderson <eanderson@carolina.rr.com&g= t;=20 wrote:=20
Hi Mark,
 
Yes, I can tell you, but doubt it will be = too=20 meaningful. 
 
 My regulator does have a reference to = the=20 manifold - but, this apparently only causes the pressure regulator = to react=20 to positive (boost)  manifold pressure  - in otherwords = while=20 under boost pressures the regulator will increase fuel flow to the = injectors=20 by increasing pressure. It apparently does = not=20 regulate the fuel pressure at normal manifold pressure ranges.  =
 
But, in any case my pressure regulator keeps = the fuel=20 pressure at 41 psi with one pump on and it increases to 43 with both = pumps=20 on.  Again,changing manifold pressure does not affect my = fuel=20 pressure.
 
I intend to swap it out (someday) for one = that is a=20 true manifold referenced regulator - but, sigh, just always seems to = be=20 something else to do - and it has worked for me for 10 years.  = But, I=20 could probably get an even smoother idle if I swapped it out. =
 
  I would say 41-43 psi would be a = reasonable setting. 
 
Ed
 
 ----- Original Message ----- =
From: = Mark = Steitle
To: Rotary = motors in=20 aircraft
Sent: Saturday, June 02, = 2007 8:25=20 PM
Subject: [FlyRotary] MAP = Referenced=20 Fuel Pressure Regulator

 
Ed,
 
Can you tell me what pressures you're seeing on your fuel = pressure at=20 idle, mid-range, and WOT?  Also, please verify that you set = the fuel=20 pressure with engine stopped and fuel pumps ON.  What = should the=20 fuel initial fuel pressure be set at for our = purposes? =20
 
Thanks,
Mark=20 S.

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