Bill,

I don't have an EM-2, but see in the installation manual that there is a connection from the primary injector signal of the EC-2 to the EM-2.  Most likely the EM-2 determines RPM from the frequency of the primary injector signal and determines the fuel flow rate from the primary injector signal pulse width along with RPM.  With the power interrupted to the primary injectors, the RPM and fuel flow rate would be indeterminate.  So I would expect that the behavior you are seeing is normal.

Steve Boese

________________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of Bill Bradburry <flyrotary@lancaironline.net>
Sent: Friday, February 5, 2016 11:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Is this normal behavior?

I was rechecking the EC-2 behavior today when I disable the injectors.
With the engine at about 3K rpm I disabled the primary injectors and the
engine stumbled a little then picked up and ran but when I looked over at
the EM-2 I saw that the engine rpm was indicating 7300 rpm!  This was only
an indication since the engine had not increased speed.

I then increased the manifold pressure to about 22 inches and over 4K rpm
and disabled the primary injectors again.  The engine transitioned much
smoother and ran, but I was watching the EM-2 this time and the rpm
indication first jumped to 7900 then to zero.  This while the engine
continued at the same speed.

I have never looked at the rpm before when I checked the injectors but this
does not seem like normal behavior.  Is it??

Bill


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