X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([204.127.217.102] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2962502 for flyrotary@lancaironline.net; Tue, 10 Jun 2008 23:33:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=204.127.217.102; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-146-124-202.mco.bellsouth.net[72.146.124.202]) by isp.att.net (frfwmhc02) with SMTP id <20080611033255H020040dsee>; Wed, 11 Jun 2008 03:32:55 +0000 X-Originating-IP: [72.146.124.202] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Sensors Date: Tue, 10 Jun 2008 23:32:58 -0400 Message-ID: <055D129E53A945F88620D2DF7D0D7368@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0030_01C8CB52.51864550" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcjLWdXTdxYx1hvHQ1GP7bGsKJlBXAAGVQiQ X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18000 This is a multi-part message in MIME format. ------=_NextPart_000_0030_01C8CB52.51864550 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I have two MAP ports on the rear of my intake plenum that feed the EC-2. I am taking the pressure from this third port at the bottom of the manifold to the regulator. I have a vacuum gage.I guess I should check the steadiness and consistency of all three ports. Bill _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Tuesday, June 10, 2008 9:26 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Sensors 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 ------=_NextPart_000_0030_01C8CB52.51864550 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I have two MAP ports on the rear of my intake plenum that feed = the EC-2.  I am taking the pressure from this third port at the bottom of the = manifold to the regulator.  I have a vacuum gage…I guess I should check = the steadiness and consistency of all three ports. 

 

Bill

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Tuesday, June 10, = 2008 9:26 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Sensors

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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