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Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 450799 for flyrotary@lancaironline.net; Sat, 02 Oct 2004 20:36:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.69; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041003003629.BEKT1791.imf21aec.mail.bellsouth.net@rd> for ; Sat, 2 Oct 2004 20:36:29 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] MAP pulses (20B) Date: Sat, 2 Oct 2004 19:36:47 -0500 Message-ID: <000201c4a8e1$10d9be70$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01C4A8B7.2803B670" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C4A8B7.2803B670 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit What surprised me was that with the engine running at 2000, the pointer was swinging very rapidly over a range of over a pretty wide range; from about 27 to 37 psi. It is an undamped bourdon-tube gauge, responding to a lot of pulsing. I had no pulse filtering between the manifold and the fuel pressure regulator. Was the engine running smoothly at 2000? Did all the improvements you made actually allow you to run a smooth idle down around 1000 or so? As you may recall, I tried using a fuel filter and a needle valve to smooth out my idle, with absolutely no success. I've had a normal vacuum gauge on the line before, and never saw any significant bouncing around. I never looked at the fuel pressure with a normal gauge when the engine was running though. Still thinking about all this... Rusty (new rudder and aileron ready to install and hopefully fly tomorrow) ------=_NextPart_000_0003_01C4A8B7.2803B670 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

What surprised me was that with the engine running at = 2000, the=20 pointer was swinging very rapidly over a range of over a pretty wide = range; from=20 about 27 to 37 psi. It is an undamped bourdon-tube gauge, = responding to a=20 lot of pulsing. I had no pulse filtering between the manifold and = the fuel=20 pressure regulator.

Was the engine running smoothly at = 2000? =20 Did all the improvements you made actually allow you to run a smooth = idle down=20 around 1000 or so?

As you may recall, I tried using a = fuel filter=20 and a needle valve to smooth out my idle, with absolutely no = success. I've=20 had a normal vacuum gauge on the line before, and never saw any = significant=20 bouncing around. I never looked at the fuel pressure with a normal = gauge=20 when the engine was running though.

Still thinking about all = this...

Rusty (new rudder and aileron = ready to install=20 and hopefully fly tomorrow)

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