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Date: Wed, 21 Mar 2012 14:58:03 -0500
Message-ID: <CAHh3jbMwCsRhFAbY4e7_V2bGF83-5qWrpis5m9MyeAWctE_EKg@mail.gmail.com>
Subject: #1 rotor cutting out
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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I have been chasing a problem with my p-port 3-rotor where the #1
rotor cuts out at around 3800 rpm, but comes back at around 5000 rpm.
When this happens, I can hear a change in the exhaust, and I see the
EGT on #1 drop way down to around 500*, so that's how I determined
that it was the #1 rotor.  The other two rotors continue to run
normally.

I have tried swapping coils, replacing the #1 rotor's plugs & coil
wires, and swapping injectors.  I have not tried the B controller, but
that sounds like what I should try next.  My suspicion is there may be
a defective coil driver circuit in the EC-2.  I have borrowed another
20B EC-2 to try, but won't be able to do the swap until this coming
weekend.

Since things have been so quiet on the list, I thought I would post
this strange problem and see what suggestions others may have.

Mark S.