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From: "Steven W. Boese" <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Date: Tue, 30 Mar 2010 08:07:23 -0600
Subject: RE: [FlyRotary] Re: FLIGHT DATA 1
Thread-Topic: [FlyRotary] Re: FLIGHT DATA 1
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I used small fuel filters in the MAP sensing line.  I soldered the end clos=
est to the intake manifold shut and then drilled a small hole through the s=
older.  This hole was small enough to cause instability (surging) of the en=
gine at idle.  The hole through the solder was successively drilled larger =
until the surging stopped.  The resulting damping system has been in use on=
 my plane for several years now.  I haven't tried removing it to see if the=
 upgraded EC2's don't need this.  It's been long enough that I can't rememb=
er what size of hole I ended up with, although that would be easy enough to=
 measure next time the cowl is off.

Steve Boese


________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of =
Bill Bradburry [bbradburry@bellsouth.net]
Sent: Monday, March 29, 2010 9:37 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: FLIGHT DATA 1

I have heard of others using some kind of expansion chamber like this, but
Don is the first I have heard of including a restriction in the line as
well.  He got an improvement with the restriction before he added the
expansion chamber.  I wonder if both would be needed to dampen out the
pulses?

Bill B=