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Date: Mon, 4 Jun 2007 16:50:33 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: EC2 operations, was Re: Houston, we have a problem...
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On Mon, 4 Jun 2007 15:11:53 -0800
"Al Gietzen" <ALVentures@cox.net> wrote:

> Tracy does some magic stuff with that EC2.  With a V8 there are always
> two injector firing at once.  As best I can understand it, the fuel is
> squirted in sort of whenever and the engine sucks it in when it needs
> it.  So for a 20B, he uses 3 signals for the injectors and one for the
> staging relay which applies power to the secondaries.
> 
> Bob W.
> 
> Unfortunately, taking that approach on the 20B version lead to a back-door
> circuit to the secondary through the primary, allowing about 1/2 voltage
> pulses to the injectors that are turned off.  It's going to take some diodes
> in the injector circuit to cut that off.  Haven't installed those yet.
> 
> Al
> 

Hmmm, I wonder if that has anything to do with the fact that when I
disable the primary injectors the EM2 RPM reading doubles.  I expected
it to go to zero.  It reads fine with the secondaries disabled.  This
is on a 13B of course.  Eventually I would have put a scope on it but
now I'll let the next guy do it. :)

Bob W.


-- 
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