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 5.1.9) with ESMTP id 2081705 for flyrotary@lancaironline.net; Sun, 03 Jun 2007 11:55:22 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.44; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao102.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070603155442.YEXB5800.fed1rmmtao102.cox.net@fed1rmimpo02.cox.net> for ; Sun, 3 Jun 2007 11:54:42 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id 73ui1X00b1xAn3c0000000; Sun, 03 Jun 2007 11:54:42 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] EC-2/EM-2 manifold pressure Date: Sun, 3 Jun 2007 08:55:40 -0800 Message-ID: <000501c7a600$04491e20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C7A5BC.F625DE20" 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 V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C7A5BC.F625DE20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Ed, When I have my EM-2 on, EC-2 off, the Manifold pressure reads the = barometric pressure (29.7 today). =20 When I then turn on the EC-2, the manifold pressure increases to 32.9. = This seems peculiar, have you noticed anything like this? =20 Bill Schertz KIS Cruiser #4045 When the EC2 is off, it is using the reading from the sensor in the EM2. When it is on, it is reading the sensor in the EC2. I have also found considerable disagreement on these sensors. I also found that I had to change the calibration on the MAP pressure channel on the EM2 to get the correct reading (with EC2 on, we don't care what the sensor in the EM2 = is reading). I have no idea why the calibration should be different on different units that use the same sensor; but there it is. You can get = a vacuum gage (actually a pressure gage, so you have to subtract from atmospheric) at a reasonable price from McMaster-Carr, or I could loan = you mine. =20 =20 Also, it should not necessarily read the barometric pressure; you have = to adjust for altitude. Barometric is equivalent sea level (or something = like that). =20 Al ------=_NextPart_000_0006_01C7A5BC.F625DE20 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Ed,

When I have my EM-2 on, = EC-2 off, the Manifold pressure reads the barometric pressure (29.7 = today).

When I then turn on the = EC-2, the manifold pressure increases to 32.9. This seems peculiar, have you noticed anything like this?

Bill Schertz
KIS Cruiser #4045

When the EC2 is off, it is using = the reading from the sensor in the EM2. When it is on, it is reading = the sensor in the EC2. I have also found considerable disagreement on these sensors. I also found that I had to change the calibration on the = MAP pressure channel on the EM2 to get the correct reading (with EC2 on, we = don’t care what the sensor in the EM2 is reading). I have no idea why = the calibration should be different on different units that use the same sensor; but = there it is. You can get a vacuum gage (actually a pressure gage, so you = have to subtract from atmospheric) at a reasonable price from McMaster-Carr, or = I could loan you mine.

Also, it should not necessarily = read the barometric pressure; you have to adjust for altitude. Barometric = is equivalent sea level (or something like that).

Al

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