If you have different size injectors it may
require a mixture adjustment. My primary’s and secondary’s are the
same size and no adjustment is necessary. If disabling the secondary’s
below staging causes any effect it’s most likely a wiring problem. Have
you tried disabling the secondary’s by removing their power source
instead of your injector switch?
Bobby
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Wednesday, January 12, 2011
11:12 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] SEcondary
injector idle was: [FlyRotary] Apex seals and MAP table corruption?
Bill, my experience is that at idle, you are running only
on the primary injectors, if you turn off the secondary there is
absolutely no effect at all (provided you are below the staging point) -
because they are not injecting. However, if you have power to both
primary and secondary injectors and turnoff the primary injectors - the
secondary injectors will kick in (or should) and start injecting.
But, what I have found is that if I don’t' immedately
turn the mixture control to full rich immediately after turning off the primary
injectors - the engine will die. If in immedately enrich the engine will
cough and then start to run at which point I must lean it back and then
the engine will idle fine on the secondary injectors. My theory is there
is no fuel flowing in the secondary runners because the secondary injectors are
not firing - so for an instance there is nothing but air flowing into the
combustion chamber which can cause it to die, unless you quickly over enrich
it. (but the theory could be all wet {:>)
Sent:
Wednesday, January 12, 2011 9:45 PM
Subject:
[FlyRotary] Apex seals and MAP table corruption?
Chris, what is the latest scoop on the
stuck apex seals? Did they free up?
I currently have every thing (cowl,
inspections plates, etc.) opened up so I can’t investigate this further
right now, but the last time I taxied my plane, I noticed that it was really
lean at idle (took mixture knob to 4 pm) and when I ran it up, I could only get
a little over 6K (previous would go to 6900!) rpm and the mixture knob full
rich would not bring the mixture bar graph visible. I am pretty certain
that my MAP table is corrupted. This is the first time this has happened
to me.
I am pretty certain that it was the time
before that I switched the CPU from “A” to “B” and
tested my coils. This was the first time I had done this. I
normally just run it in “A” and am trying to get the tuning in so I
can copy that to “B”.
Also, when I test the injectors…I
have only done this at idle, if I disable the secondary, it stumbles, but keeps
running. When I disable the primary, it would die if I didn’t
immediately switch it back. Sounds like the cold start might not be
engaging on the primary??? Does anybody have any suggestions?
Those of you who have had your MAP table
corrupted, was a switch between CPUs and or coil testing involved prior to the
problem? Could there be some involvement here???
Bill B