X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from alnrmhc16.comcast.net ([204.127.225.96] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2082949 for flyrotary@lancaironline.net; Mon, 04 Jun 2007 08:03:58 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.225.96; envelope-from=wschertz@comcast.net Received: from wschertzpc (c-24-7-194-231.hsd1.il.comcast.net[24.7.194.231]) by comcast.net (alnrmhc16) with SMTP id <20070604120259b1600o2424e>; Mon, 4 Jun 2007 12:03:09 +0000 Message-ID: <5C3359CE05394CD59F379CE14587545C@WschertzPC> From: "Bill Schertz" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: EC-2/EM-2 manifold pressure Date: Mon, 4 Jun 2007 07:02:58 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0061_01C7A676.623D1330" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16386 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16386 This is a multi-part message in MIME format. ------=_NextPart_000_0061_01C7A676.623D1330 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al, thanks for the clarification on what sensor the EM2 is reading. When I set an 'old fashioned' altimeter to field elevation, the engine = is not running, isn't the Kolsman window reading the local pressure -- = ie the 'manifold' pressure? Bill Schertz KIS Cruiser #4045 ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Sunday, June 03, 2007 11:55 AM Subject: [FlyRotary] Re: EC-2/EM-2 manifold pressure 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. =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). Al ------=_NextPart_000_0061_01C7A676.623D1330 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Al, thanks for the clarification on = what sensor the=20 EM2 is reading.
 
When I set an 'old fashioned' altimeter = to field=20 elevation, the engine is not running, isn't the Kolsman window reading = the local=20 pressure -- ie the 'manifold' pressure?
Bill Schertz
KIS Cruiser = #4045
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Sunday, June 03, 2007 = 11:55=20 AM
Subject: [FlyRotary] Re: = EC-2/EM-2=20 manifold pressure

 

Ed,

When I have my EM-2 on, = EC-2 off,=20 the Manifold pressure reads the barometric pressure (29.7=20 today).

 

When I then turn on the = EC-2, the=20 manifold pressure increases to 32.9.  This seems peculiar, have = you=20 noticed anything like this?

 

Bill Schertz
KIS = Cruiser=20 #4045

When the = EC2 is=20 off, it is using the reading from the sensor in the EM2.  When it = is on,=20 it is reading the sensor in the EC2. I have also found considerable=20 disagreement on these sensors.  I also found that I had to change = the=20 calibration on the MAP pressure channel on the EM2 to get the correct = reading=20 (with EC2 on, we don=92t care what the sensor in the EM2 is reading). =  I=20 have no idea why the calibration should be different on different = units that=20 use the same sensor; = but there=20 it is.  You can get a vacuum gage (actually a pressure gage, so = you have=20 to subtract from atmospheric) at a reasonable price from = McMaster-Carr, or I=20 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).

 

Al

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