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Date: Mon, 28 May 2012 20:38:29 -0500
Message-ID: <CAHh3jbPTqBUX7z667LfRssXf-6+dDQPgYc4ML+5xOcPCnmJ-1Q@mail.gmail.com>
Subject: Injector balancing
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>, Friends of EM-3 <EC3_RWS@yahoogroups.com>
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I'm in a bit of a dilemma and thought I would put this out here for the
group to ponder.

First, this is a p-ported 3-rotor, running RWS EC-2 and psru.  I'm running
460cc Mazda primary injectors and 60lb Deka IV secondary injectors.
 Primary injectors share a common fuel rail and are positioned close to the
engine, between throttle plate and rotor face.  Secondary injectors are
located ahead of the throttle plates.  As this is a p-port engine, it has
three 1-bbl TB's, located very close to the engine.  Engine will idle down
to 800 - 900 rpm, but I normally idle it around 1500 - 1600 rpm.

The problem is this, the #1 rotor cuts out at low to mid-range RPM,
evidenced by obvious reduced power, very low EGT's on rotor #1, change in
exhaust tone, a dark residue in the #1 exhaust port and dark spark plugs on
#1.  Just today I was able to get it to run normally with balanced EGT's by
adjusting Mode 4, but I had to go *full CCW* with the program knob to
achieve this.  (Mode 4 & 5 adjust similar to Mode 1)  Now it runs well
mid-range and the dropped #1 rotor is happily firing away.  I still have
some tuning to do, but after adjusting Mode 4, I can now move forward with
that.

To date I have tried the following:
  1.  Performed a compression check - OK
  2.  Swapped primary injector with #3 - no change
  3.  Swapped coils with #3 - no change
  4.  Replaced spark plugs - no change, except initially it ran better
until the plug fouled
  5.  Checked plug wires with ohm meter - checked good
  6.  Sent EC-2 to Tracy for latest s/w and checkout - no abnormalities
found, latest s/w installed
  7.  Checked secondary injectors for leakage - none seen

Can anyone suggest a reason why the #1 primary injector runs extremely rich
when set to the factory default setting?  Is this something to be concerned
with?

Thanks,
Mark

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I&#39;m in a bit of a=A0dilemma and thought I would put this out here for t=
he group to ponder. =A0<div><br></div><div>First, this is a p-ported 3-roto=
r, running RWS EC-2 and psru. =A0I&#39;m running 460cc Mazda primary inject=
ors and 60lb Deka IV secondary injectors. =A0Primary injectors share a comm=
on fuel rail and are positioned close to the engine, between throttle plate=
 and rotor face. =A0Secondary injectors are located ahead of the throttle p=
lates. =A0As this is a p-port engine, it has three 1-bbl TB&#39;s, located =
very close to the engine. =A0Engine will idle down to 800 - 900 rpm, but I =
normally idle it around 1500 - 1600 rpm.</div>
<div><br></div><div>The problem is this, the #1 rotor cuts out at low to mi=
d-range RPM, evidenced by obvious reduced power, very low EGT&#39;s on roto=
r #1, change in exhaust tone, a dark residue in the #1 exhaust port and dar=
k spark plugs on #1. =A0Just today I was able to get it to run normally wit=
h balanced EGT&#39;s by adjusting Mode 4, but I had to go <u>full CCW</u> w=
ith the program knob to achieve this. =A0(Mode 4 &amp; 5 adjust similar to =
Mode 1) =A0Now it runs well mid-range and the dropped #1 rotor is happily f=
iring away. =A0I still have some tuning to do, but after adjusting Mode 4, =
I can now move forward with that. =A0=A0</div>
<div><br></div><div>To date I have tried the following:</div><div>=A0 1. =
=A0Performed a compression check - OK</div><div>=A0 2. =A0Swapped primary i=
njector with #3 - no change</div><div>=A0 3. =A0Swapped coils with #3 - no =
change</div>
<div>=A0 4. =A0Replaced spark plugs - no change, except initially it ran be=
tter until the plug fouled</div><div>=A0 5. =A0Checked plug wires with ohm =
meter - checked good</div><div>=A0 6. =A0Sent EC-2 to Tracy for latest s/w =
and checkout - no abnormalities found, latest s/w installed</div>
<div>=A0 7. =A0Checked secondary injectors for leakage - none seen</div><di=
v><br></div><div>Can anyone suggest a reason why the #1 primary injector ru=
ns extremely rich when set to the factory default setting? =A0Is this somet=
hing to be concerned with?</div>
<div><br></div><div>Thanks,</div><div>Mark</div><div>=A0=A0</div>

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