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From: Dale Rogers <rogersda@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Engine start
Date: Sat, 18 Sep 2004 18:05:39 -0400
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> From: "John Slade" <sladerj@bellsouth.net>
> Date: 2004/09/18 Sat PM 05:54:55 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Engine start
> 
> MessageOK, Guys. Here's another chance for your valued remote diagnosis
> input.
> 
> After 2 months hiatus my engine now starts reliably and runs
> consistently....just very very badly. In all the time I've had the engine
> running, with various problems of mixture and tuning it has NEVER run this
> rough. It shakes, and max rpm is about 2100. Each plug seems to have a good
> spark but today I installed new plugs anyway and checked the voltage on all
> coils and injectors. It runs exactly the same as it did yesterday. The plugs
> are black and the engine blows a bit of blue smoke.
> 
> It IS running rich, so I tried changing the overall range with mode 3. As I
> lowered the mixture with 7 or 8 pushes the rpm came up a bit, then started
> to slow down again. At the best rpm the EC2 is showing slightly higher than
> center on the mixture. I tried switching off either set of coils and felt a
> degradation with either off. Disabling secondary injectors killed the
> engine. Primaries didn't make much difference. I checked compression. 105#
> on each rotor.
> 
> My next thought is to check that cold start is operating properly, but I'm
> pretty sure it is because the engine slowed down when I tried switching it
> on.
> 
> I spoke with Tracy and he suspects fuel, possibly a bad connection in the
> injector wiring, so tomorrow I'll rewire the entire injector circuit if
> necessary.
> 
> I'm so glad Rusty still doesn't have power. I'm not in any mood for jokes :(
> 
> Thoughts anyone???
> 
> Frustrated in West Palm

John, 

   It sounds as though you've done the basic trouble-
shooting.  For whatever reason, your EC2 is trying to 
run the engine solely (or nearly so) on the secondary
injectors.  

   IIRC, it's supposed to do that if it loses the 
primaries, isn't it?  How does it know that the primaries 
are "gone"? High resistance?  Could you have a high 
impedance connection to your primary injectors?  A static 
voltage check most likely would find that.  It will only 
show up when working current is flowing (or, rather, 
*trying* to).

Dale R.