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

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Steven W. Boese
Sent: Monday, March 29, 2010 11:13 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: FLIGHT DATA 1

A small fuel filter with ends for clamping on hose works good for adding
volume to the MAP sensor line, too.

Steve Boese



________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of
Mike Wills [rv-4mike@cox.net]
Sent: Monday, March 29, 2010 8:29 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: FLIGHT DATA 1

I used a couple of short lengths (maybe 2"?) of sched 40 PVC pipe, pipe
caps, and brass tubing for the hose connections. I'm not sure that the
packing Don used is necessary - the goal is to add some volume to get some
damping. A more elegant way would be to electrically filter/damp the MAP
sensor outputs, but this is cheap, easy, and works.

Mike Wills
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