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From: "Al Gietzen" <ALVentures@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: progress report #347c
Date: Tue, 23 Jun 2009 07:25:22 -0800
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Importance: Normal

Your MP in the closed hangar should read the same as your altimeter.  =
Set
the altimeter to the field elevation and read the pressure in the =
Kollsman
window.  If they don't match, one or the other is incorrect.=20
-----------------
Don, Bill;

I'm quite certain that is not entirely correct.  There is a correction =
that
must be applied depending on field elevation.  For example; if the field
elevation is 1500'; you'd multiply the altimeter setting by 0.947.  I =
have a
table of corrections; give me your field elevation, and I'll give you =
the
correction.

The best 'filter' for smoothing MAP pulses is not just an orifice
(resistor); but a combination of some volume (capacitance) and an =
orifice.
You might consider adding some volume (a fuel filter works good) between =
the
port and your orifice.  Bill is right; it should not jump around when =
the
engine is not running.

Al G


 The pressure
should also be solid.  It should not jump around in the closed hangar.  =
If
you are outside, wind on the static source can make it move, but not in =
the
hangar.

Bill B=20

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Don Wallker
Sent: Tuesday, June 23, 2009 12:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] progress report #347c

List,
    Thanks for all the great suggestions from my "Not getting full =
power"
post.  Concerning the RPM dropping out above 6000 RPM.  This weekend I
dropped by my local FBO.  They didn't have any #12 aircraft wire, but =
after
describing what I was trying to do (eliminate electrical
noise) he suggested #16-2 with shield.  I installed it by tying both =
#16s
together and running it from the battery to a 5 amp breaker and then =
onto
the EM-2 and EC-2.  Grounded the shielding near the battery and not on =
the
other end.  I also moved my high power wires to the injectors and coils =
away
from other things.  I know that is bad engineering, doing 2 changes at =
once,
but it was easy to move the wires at that time.  Fired it up, ran it at =
a
fast idle, and turned injectors on and off.  The RPM stayed on with the
secondaries off, and got squirrelly with the primaries off.  Similar
situation at full throttle, 5880 RPM or so, so I think I have that =
licked.
The proof will be in the air.  Thanks Tracy and all the rest of you.=20
    Sunday I got thinking about the MP pressure being all over the =
place.
The local RV guru told be that he couldn't get his analog MP gauge to be
steady until he drilled a 1/16th inch hole in a rivet, and put it in the
line as a dampener.  I thought, that's easy to do!  I noticed that the =
spout
on my oiler is a small diameter, so sticking a drill bit in it, found it =
was
1/16 inch.  I cut off 2 inches and inserted a piece in each manifold =
line,
Tightened it down and fired it up.  6080 RPM!  When a wind came up, it =
read
6150 for a short time. =20
More than I have ever gotten on the ground.  HP display ever read 147 =
HP!
And the MP had settled down.  Exhaust gas temps are not as high, they =
are
closer together, but still about 150 f  different..  My theory is that =
with
the MP being all over the place.  The EC-2 computer, doesn't know what =
to
do, so is switching back and forth to different MAP addresses as they =
come
up, trying to do it's best.  With the MP, much steadier, the EC-2 can do =
a
much better job.  This also seems to explain why the auto-tune never =
worked.
I'll give that a try soon.  I am working on dampening the pulses down
further.  Tonight, I installed 5 inches of the 1/16th inch tubing.  =
Still
bouncing around some.  I made a dampener consisting of a green scrub =
pad,
rolled up very tight, stuffed in a 5/8 inch plastic tube with barbs on =
both
ends and installed between the 1/16 inch tube and EM-2.  At 2000 RPM it
bounces around between 10.1 and 10.4.  At full throttle, it bounces =
around a
little more 24.5 to 25.1.  One other thing I noticed, is that with the
engine off, all other electrical off and only the EM-2 and EC-2 on, in a
closed hanger, a cold beer in hand, the MP bounces around from 24.5 to =
24.8.
Oh, and my true airspeed reads 14 MPH on the EM-2 when every thing else =
is
turned off. =20
Is all this normal?  Sorry, but I no longer know normal.  What are the =
rest
of you getting? Is it possible to get the MP rock steady?  5000ft elev, =
75 F
    In reference to the guy who was asking about fuel pressure, I set =
mine
for 38 PSI.  Recently, I hooked up a Vacuum line from the manifold to =
the
pressure regulator.  As Idle, the pressure is now about 34 and a full =
power,
about 39 psi.  This has messed with my mixtures, but I will go back and
remap, and will try auto-tune.  The Rotory gods are almost smiling.

Don Walker
N113BR RV-8
Renesis, EC-2 EM-2,  2.85 PSRU
Electric seatcovers, Power ashtray

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