X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from bay0-omc2-s15.bay0.hotmail.com ([65.54.246.151] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2091672 for flyrotary@lancaironline.net; Fri, 08 Jun 2007 12:43:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.151; envelope-from=lors01@msn.com Received: from hotmail.com ([65.54.250.88]) by bay0-omc2-s15.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Fri, 8 Jun 2007 09:42:39 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 8 Jun 2007 09:42:38 -0700 Message-ID: Received: from 4.171.147.69 by BAY115-DAV16.phx.gbl with DAV; Fri, 08 Jun 2007 16:42:38 +0000 X-Originating-IP: [4.171.147.69] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EC-2/EM-2 manifold pressure Date: Fri, 8 Jun 2007 12:42:35 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01DE_01C7A9CA.7D3D0F30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.50.0034.2000 Seal-Send-Time: Fri, 8 Jun 2007 12:42:35 -0400 X-OriginalArrivalTime: 08 Jun 2007 16:42:38.0989 (UTC) FILETIME=[0681BBD0:01C7A9EC] Return-Path: lors01@msn.com This is a multi-part message in MIME format. ------=_NextPart_000_01DE_01C7A9CA.7D3D0F30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The internal MAP sensor on the EM2 is there only for installations = without an EC2 (I.e. Lycomings and a few other diehard carburetor users = : ). Since the same calibration constants are used for both sensors, = only one of them can be correct. Obviously you should calibrate using = the "EC2 on" sensor. EM2's not shipped with their companion EC2's are = roughly calibrated with the bench test EC2 and so may require = re-calibration with your EC2. Best way to do this is to adjust sensor = offset on MAP channel (#25 I think) until reading matches your current = absolute barometric pressure. Use 30" - 1" per 1000 ft of altitude and = it will get you close enough. Tracy Crook 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=20 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=20 different on different units that use the sam e 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). ------=_NextPart_000_01DE_01C7A9CA.7D3D0F30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The internal MAP sensor on the EM2 is there only for installations = without=20 an EC2 (I.e. Lycomings and a few other diehard carburetor users : = ).  Since=20 the same calibration constants are used for both sensors, only one of = them can=20 be correct.  Obviously you should calibrate using the "EC2 on"=20 sensor.   EM2's not shipped with their companion EC2's are = roughly=20 calibrated with the bench test EC2 and so may require re-calibration = with your=20 EC2.  Best way to do this is to adjust sensor offset on MAP channel = (#25 I=20 think) until reading matches your current absolute barometric = pressure. =20 Use 30" - 1" per 1000 ft of altitude and it will get you close = enough.
 
Tracy Crook
 

Bill Schertz
KIS Cruiser #4045

When the EC2 is off, = it is=20 using the reading from the sensor in the
EM2. When it is on, it is = reading=20 the sensor in the EC2. I have also
found considerable disagreement on = these=20 sensors. I also found that I
had to change the calibration on the = MAP=20 pressure channel on the EM2 to
get the correct reading (with EC2 on, = we don't=20 care what the sensor in
the EM2 is reading). I have no idea why the=20 calibration should be
different on different units that use the sam = e=20 sensor; but there it
is. You can get a vacuum gage (actually a = pressure gage,=20 so you have
to subtract from atmospheric) at a reasonable price from=20 McMaster-Carr,
or I could loan you mine.



Also, it = should not=20 necessarily read the barometric pressure; you have
to adjust for = altitude.=20 Barometric is equivalent sea level (or
something like=20 that).

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