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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 -----
Sent: Sunday, June 03, 2007 11:55
AM
Subject: [FlyRotary] Re: EC-2/EM-2
manifold pressure
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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