X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao102.cox.net ([68.230.241.44] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2962324 for flyrotary@lancaironline.net; Tue, 10 Jun 2008 20:26:46 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.44; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao102.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080611002558.BGMD1150.fed1rmmtao102.cox.net@fed1rmimpo01.cox.net> for ; Tue, 10 Jun 2008 20:25:58 -0400 Received: from BigAl ([72.192.137.74]) by fed1rmimpo01.cox.net with bizsmtp id cQS61Z00S1cVYgg03QS61J; Tue, 10 Jun 2008 20:26:06 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Sensors Date: Tue, 10 Jun 2008 17:26:08 -0800 Message-ID: <000301c8cb62$2013c820$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C8CB1F.11F08820" 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 V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C8CB1F.11F08820 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Perhaps I should add that the original line from the sensing ports to = the pressure regulator was quite short; maybe 10"; so there was very little damping there. =20 My fuel pressure regulator (Airmotive) is getting its MAP from the two = small (1/8 ") tubes that lay in the primary ports on the Renesis.Are you = saying that I should move this pressure reference to someplace else? You say = you know it is not good.How do you know this? =20 Bill B=20 Bill; =20 I was measuring fuel pressure to the fuel rails to verify the EM2 calibration. The needle on the gauge was swinging very rapidly from = about 20 to 40. I don't recall what RPM, but I guess near idle. Perhaps = stating that "it is not good" is an overstatement, and perhaps it just happened = that the pressure pulses hit a resonance in the gauge; but my judgment was = that it could affect the engine operation and could be damaging to something = else long term. I had already put damping in MAP line to the EC2, so I = decided to T it into that line, and the pressure pulsing went away. =20 I have a 3-barrel TWM TB on a short intake manifold. The MAP sensing = ports are just downstream of the throttle plates. =20 Al ------=_NextPart_000_0004_01C8CB1F.11F08820 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Perhaps I should add that the original line from the sensing ports to the = pressure regulator was quite short; maybe 10”; so there was very little = damping there.

 

My fuel pressure regulator (Airmotive) is = getting its MAP from the two small (1/8 “) tubes that lay in the primary ports = on the Renesis…Are you saying that I should move this pressure reference = to someplace else?  You say you know it is not good…How do you = know this?

 

Bill B 

Bill;

 

I was measuring fuel pressure to the fuel rails to verify the EM2 calibration.  The needle on the gauge was swinging very rapidly = from about 20 to 40.  I don’t recall what RPM, but I guess near = idle.  Perhaps stating that “it is not good” is an overstatement, and = perhaps it just happened that the pressure pulses hit a resonance in the gauge; but = my judgment was that it could affect the engine operation and could be = damaging to something else long term.  I had already put damping in MAP line to = the EC2, so I decided to T it into that line, and the pressure pulsing went = away.

 

I have a 3-barrel TWM TB on a short intake manifold.  The MAP sensing = ports are just downstream of the throttle plates.

 

Al

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