X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2434899 for flyrotary@lancaironline.net; Fri, 26 Oct 2007 19:48:46 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao104.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071026234809.MKHA1433.fed1rmmtao104.cox.net@fed1rmimpo02.cox.net> for ; Fri, 26 Oct 2007 19:48:09 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo02.cox.net with bizsmtp id 5Bo91Y0074AaN600000000; Fri, 26 Oct 2007 19:48:09 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] MAP port location Date: Fri, 26 Oct 2007 16:49:52 -0800 Message-ID: <000001c81833$48bd1890$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C817F0.3A99D890" 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_0001_01C817F0.3A99D890 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] MAP port location =20 What is the best location for MAP ports on the intake. Close to the = engine or further away? I have the modified Renesis lower manifold that has two ports installed. Are these the best locations for the EC2 or should I = place new ones further back in the upper manifold? =20 For the EC2 I would recommend putting the MAP sensing port out in the = plenum before the runners. The best reason I can give is that that's where = Tracy puts it, and the programming in the unit assumes that's where it is. You want it to see essentially ambient pressure at WOT. =20 I have a 3-barrel TWM TB on a very short manifold, and the sensor ports just downstream from the butterflys. The "runners" are effectively upstream, so there is pressure drop before the sensor ports. At high = RPM (6000) and WOT the MAP sensed is about 3.5"Hg less than the ambient pressure. =20 Also close to the ports on the engine there is fairly severe pulsing, so = I had to add some volume and restriction to smooth (analogous to an RC = filter in electronics) the pressure read at the controller; and the MAP = pressure reference to the fuel pressure regulator. Before doing that the needle = on a pressure gauge at the fuel rail would 'buzz' over a range of about 10 = psi. =20 Al ------=_NextPart_000_0001_01C817F0.3A99D890 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] MAP port location

What is the best location = for MAP ports on the intake. Close to the engine or further away? I have the = modified Renesis lower manifold that has two ports installed. Are these the best locations for the EC2 or should I place new ones further back in the = upper manifold?

For the EC2 I would recommend = putting the MAP sensing port out in the plenum before the runners. The = best reason I can give is that that’s where Tracy puts it, and the programming in the unit assumes = that’s where it is. You want it to see essentially ambient pressure at = WOT.

I have a 3-barrel TWM TB on = a very short manifold, and the sensor ports just downstream from the = butterflys. The “runners” are effectively upstream, so there is pressure = drop before the sensor ports. At high RPM (6000) and WOT the MAP sensed is = about 3.5”Hg less than the ambient pressure.

Also close to the ports on the = engine there is fairly severe pulsing, so I had to add some volume and = restriction to smooth (analogous to an RC filter in electronics) the pressure read at = the controller; and the MAP pressure reference to the fuel pressure = regulator. Before doing that the needle on a pressure gauge at the fuel rail would = ‘buzz’ over a range of about 10 psi.

Al

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