X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.25.9.102] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2082971 for flyrotary@lancaironline.net; Mon, 04 Jun 2007 08:18:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-03.southeast.rr.com (8.13.6/8.13.6) with SMTP id l54CHU7T006907 for ; Mon, 4 Jun 2007 08:17:31 -0400 (EDT) Message-ID: <0e7001c7a6a2$ca164b80$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EC-2/EM-2 manifold pressure Date: Mon, 4 Jun 2007 08:20:50 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0E6D_01C7A681.42B86040" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0E6D_01C7A681.42B86040 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable If you set your field altimeter so the needles point to field elevation = then the manifold pressure of your (engine not running) should ideally = read the same. But throw in transducers and calibration and instrument = error and well - you know =3D differences!! Ed ----- Original Message -----=20 From: Bill Schertz=20 To: Rotary motors in aircraft=20 Sent: Monday, June 04, 2007 8:02 AM Subject: [FlyRotary] Re: EC-2/EM-2 manifold pressure 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_0E6D_01C7A681.42B86040 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
If you set your field altimeter so the needles = point to=20 field elevation then the manifold pressure of your (engine not running) = should=20 ideally read the same.  But throw in transducers and calibration = and=20 instrument error and well - you know =3D differences!!
 
Ed
----- Original Message -----
From:=20 Bill=20 Schertz
Sent: Monday, June 04, 2007 = 8:02 AM
Subject: [FlyRotary] Re: = EC-2/EM-2=20 manifold pressure

Al, thanks for the clarification on = what sensor=20 the 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=20 local pressure -- ie the 'manifold' pressure?
Bill Schertz
KIS Cruiser = #4045
----- Original Message -----
From:=20 Al = Gietzen=20
To: Rotary motors in = aircraft=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=20 off, the Manifold pressure reads the barometric pressure (29.7=20 today).

 

When I then turn on = the EC-2,=20 the 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=20 on, 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=20 reading (with EC2 on, we don=92t care what the sensor in the EM2 is = reading).=20  I have no idea why the calibration should be different on = different=20 units that use the same = sensor; but=20 there it is.  You can get a vacuum gage (actually a pressure = gage, so=20 you have to subtract from atmospheric) at a reasonable price from=20 McMaster-Carr, or I could loan you mine. 

 

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

 

Al

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