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                           Engines-List Digest Archive
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                     Total Messages Posted Thu 05/19/05: 1
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Today's Message Index:
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     1. 06:02 AM - Re: Install Manifold Pressure?  (Gary Casey)
 
 
 
________________________________  Message 1  _____________________________________


Time: 06:02:59 AM PST US
From: "Gary Casey" <glcasey@adelphia.net>
Subject: Engines-List: RE:  Install Manifold Pressure?

--> Engines-List message posted by: "Gary Casey" <glcasey@adelphia.net>

<<Can someone please tell me what kind of fitting to install in the
manifold for manifold pressure.  My GRT engine monitor requires a hose
from the fitting to the unit, but doesn't explain what kind of fitting
to install nor where to install it.  Thanks for any help.>>

I'm doing the same thing and haven't yet decided.  The typical engine
fitting for a Lycoming is a 1/8 pipe thread and on certified engines is
often a -2 AN steel line (1/8 steel tubing) and on my Cessna it is coiled
for about 3 turns between the engine and airframe to take up the vibration.
Since there is little pressure in the system and it isn't a flight-safety
item I think a hose barb with pretty much any size hose to the sensor would
work.  The sensor they provide assumes a 1/8 hose connection.  A simple
Tygon tube won't, I believe, tolerate the temperature so I would find a
black rubber hose (windshield washer?) to go from hose barb to hose barb.
Don't want to rely on the barb to keep the hose attached?  Then use safety
wire to make a tiny hose clamp.  I wind the wire around twice so the rubber
doesn't get pinched in the twist.  This is one place I wouldn't get carried
away with elaborate "aircraft-grade" hardware.  Incidentally, it's best to
run the hose uphill to the sensor.  That usually isn't practical so at least
run it uphill for the last few inches to the sensor and have the sensor port
facing downward.  The intent is to keep water out of the sensor.

That's what I would do.  I'm using a different style MAP sensor so what I do
won't apply.

Gary Casey