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I am not sure I am following all of this, but I had the following issue.
I have an EC-2, Blue Mountain EFIS, and EM-2
After a couple of test runs, I felt that the engine was running rich, and was doing some diagnostics.
Blue mountain OFF, EC-2 on, seemed like only 3 injectors were firing when I pushed the prime button.
Disconnected the connector from the one that didn't seem to be firing, heard a 'click'
Hmmm, tried pushing the connector on and off the contacts, and the injector would 'fire', but stay open.
Turned Blue Mountain ON, all injectors worked properly when firing the prime button. Did some measurements with diode tester and discovered that the Blue mountain tach line pulls the injector to ground when the BM is OFF, but not when it is ON. Talked to Tracy, and he recommended a 2K resistor in the tack line to limit the current and stop this behavior.
Bill Schertz
KIS Cruiser #4045
N343BS (reserved)
----- Original Message ----- From: "Bob White" <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, January 14, 2008 8:40 AM
Subject: [FlyRotary] Re: EC2
Hi Bob,
I can't think of any good reasons to hear anything from the connector,
and only a couple of not so good ones. A current high enough to make a
spark, or some mechanical movement inside the connector. The output of
the EC2 should either be at ground or a fairly high resistance so no
high current flow from there to ground. The diodes should block flow to
another injector that was still connected, so no current flow there.
I don't think putting a probe in the connector should move anything
enough to make a clicking noise. I don't know what it could be.
I'll be looking forward to a report after you get the EC2 back.
Bob W.
On Sun, 13 Jan 2008 21:27:52 EST
BMears9413@aol.com wrote:
I had the wires disconnected from the injector, so the click was from the
connector itself. Had power on one wire and no power at any time on the other.
not even a flash when the button was pushed. One the store button is pushed,
should there be power to the injector for the duration the button is held
down, or will it just flash the injector with power. If so my light might not
have time to light up if its a milisecond or so.
Bob Mears
Supermarine Spitfire
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