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Date: Fri, 20 Jan 2012 17:04:01 -0600
Message-ID: <CAHh3jbP4vtkj77b-ZBhtx_DecEyBans832T9PPtKCBMS4T2NDQ@mail.gmail.com>
Subject: P-port breakthrough
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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I made a major breakthrough today.  In preparation for hooking up my new
Hytek data logger, I decided that it would be a good idea to install check
valves in the vacuum lines leading from each rotor housing.  (For those who
are unaware, I am running a peripheral port 3-rotor with a slide throttle
TB.)  My system measures MAP from the unused oil injection ports in each
rotor housing.  Not sure what possessed me to do a ground run right then,
but I decided to do a ground run after installing the check valves.  Now
keep in mind that typical MAP readings at idle up to this point was approx.
17".  This has been bugging me, but it didn't stop me from flying.  Well,
today's MAP readings were in the 14.4" - 15.0" range.  Then it dawned on me
that the way the vacuum lines were plumbed the EC-2 would see an average of
all three rotors.  Since each rotor is 120* (crank degrees) apart in their
4-stroke cycle, the MAP would be quite a bit different for each rotor.  By
installing check valves in the vacuum lines, I have now isolated each rotor
from the other two and am measuring the lowest vacuum.  Idle is now down to
a respectable 1500 rpm, but the mixture has gone way lean, so it appears
that a re-tune is in order.  I'll probably re-set the EC-2 to the factory
defaults and start the process over from the very beginning.

I would like to strongly suggest to anyone that is measuring MAP in the
rotor housings to install check valves in each of the lines.  Your EC-2/3
will thank you for it.

Mark

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<div style>I made a major breakthrough today. =A0In preparation for hooking=
 up my new Hytek data logger, I decided that it would be a good idea to ins=
tall check valves in the vacuum lines leading from each rotor housing. =A0(=
For those who are unaware, I am running a peripheral port 3-rotor with a sl=
ide throttle TB.) =A0My system measures MAP from the unused oil injection p=
orts in each rotor housing. =A0Not sure what possessed me to do a ground ru=
n right then, but I decided to do a ground run after installing the check v=
alves. =A0Now keep in mind that typical MAP readings at idle up to this poi=
nt was approx. 17&quot;. =A0This has been bugging me, but it didn&#39;t sto=
p me from flying. =A0Well, today&#39;s MAP readings were in the 14.4&quot; =
- 15.0&quot; range. =A0Then it dawned on me that the way the vacuum lines w=
ere plumbed the EC-2 would see an average of all three rotors. =A0Since eac=
h rotor is 120* (crank degrees) apart in their 4-stroke cycle, the MAP woul=
d be quite a bit different for each rotor. =A0By installing check valves in=
 the vacuum lines, I have now isolated each rotor from the other two and am=
 measuring the lowest vacuum. =A0Idle is now down to a respectable 1500 rpm=
, but the mixture has gone way lean, so it appears that a re-tune is in ord=
er. =A0I&#39;ll probably re-set the EC-2 to the factory defaults and start =
the process over from the very beginning. =A0</div>
<div style><br></div><div style>I would like to strongly suggest to anyone =
that is measuring MAP in the rotor housings to install check valves in each=
 of the lines. =A0Your EC-2/3 will thank you for it. =A0</div><div style><b=
r>
</div><div style>Mark</div>

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