-------------- Original message from "Mike Wills" <rv-4mike@cox.net>: --------------


> 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
>
> --------------------------------------------------
> From: "Bill Bradburry"
> Sent: Monday, March 29, 2010 9:50 AM
> To: "Rotary motors in aircraft"
> Subject: [FlyRotary] Re: FLIGHT DATA 1
>
> > Don,
> > Thanks for the quick reply. One and a half tenths you say. I suppose it
> > should be rock steady especially with the engine off. I will have to
> > check
> > that. It appears that we could all benefit from trying to remove the
> > pulses
> > from the MP line. I will visit Home Depot.
> >
> > Bill B
> >
> > -----Original Message-----
> > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> > Behalf Of Don Walker
> > Sent: Monday, March 29, 2010 12:36 PM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] FLIGHT DATA 1
> >
> > I have no idea how to compute power at different altitudes and my WAG is
> > that different props and engines would make any comparison inexact at
> > best.
> > Ed probably would know best.
> > The best way that I know of to determine if you need this is to look at
> > your
> > MP on the EM-2 at a steady RPM and see if it varies. Mine varied plus or
> > minus 1 and a half tenths. If it varies with the engine OFF, you have a
> > EC-map sensor problem.
> > I went to Home Depot and got a Zoom oiler from the Swamp cooler
> > department
> > or where they sell oil for those of you who are lucky enough to live in
> > hot
> > humid places. Probably next to the WD-40. It has a small plastic cap and
> > a
> > spout that pulls out Several inches. I cut it off and inserted about 2
> > inches of it into the vacuum line going to the map sensor on the EC-2 then
> > locked it in place using several nylon wire
> > ties. It's about 1/16th inch ID, I never measured it. Greatly improved
> > things, on the display and I got more RPMs. Then I made 2 accumulators
> > using 2 inches of 1/2 ID tubing, rolled up green scubby pad tightly and
> > inserted it into the tubing. Went to the hardware store and got 4, 1/8th
> > inch barbed fittings (brass) x 1/4 MPT and inserted it into both sides of
> > the tubing, hose clamp it tight and inserted it into the vacuum line.
> > Don't
> > remember if before or after the restriction. Even better now. Works
> > great!
> > Try it! Experiment! I love these cheap, quick hardware store fixes!
> >
> > Don Walker
> > Flying N113BR
> >
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> >
> >
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