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Date: Tue, 14 Aug 2007 14:36:34 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Injector Staging
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Hi Dave,

I can't answer your question but just as an added observation, the EC2
doesn't know which set of injectors are disabled.  The disable switches
interrupt power to one set and trigger the cold start circuit.  The
cold start is the only feedback to the EC2.

Bob W.


On Tue, 14 Aug 2007 12:04:06 -0700
"David Leonard" <wdleonard@gmail.com> wrote:

> Hi Tracy (or anyone in the know),
> 
> I have what I hope is a quick question on how the EC2 treats different
> sized injectors.  I finally got my engine running again and am trying to
> re-program the computer now that I have Ed's EFI monitor and I also
> installed injector disable switches.  Those (particularly Ed's engine
> monitor) are powerful tools!  I could see right away several holes in
> my map and that I am hitting the limits of the mode-1 compensation.
> 
> Anyway, to make a long question shorter, how does the EC2 treat
> different sized primaries and secondaries (as told by the setting on the
> corresponding mode setting)?  Does it:
> 
> A) Adjust the relative pulse duration of the 2 types of injectors so
> that they are each contributing 50% of the fuel.
> 
> Or
> 
> B) Keep the pulse duration the same for all injectors but then reduce
> (or lengthen) that pulse duration above the staging point to compensate
> for the Larger (or smaller) secondary injectors.  The larger injectors
> would now be contributing a relatively larger portion of the fuel.
> 
> Or
> 
> C) Something else.
> 
> 
> If the answer above is 'B' (which makes the most sense to me), then the
> follow on question is: Does the 'cold start' switch double that pulse
> duration regardless of which injectors are shut off. (such that when
> the larger injectors are shut off, the net fuel is going to be somewhat
> decreased compared to when the smaller injectors are shut off)?
> 
> Thanks


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