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List and Tracy,
Now that I have gotten the
pulsations from the intake manifold back to the EC-2 dampened out, I'm getting
about 200 RPM more running static. About 6080 rpm now. My MP display on
the EM-2 always bounced around a lot, but the engine ran pretty well
lately. I could only get 2250 or so on climb out, 65 degree day, 5000
ft field elev, so I knew I was not getting full power. I haven't flow
since this change. I figure that since the EC-2 runs almost entirely off
the Manifold pressure the pulsations where telling the computer to change to
differant MAP addresses that didn't correspond to the RPM and what the engine
was doing, or trying to do. Now with everthing much more coordinated, the
engine is running stronger. I accomplished this by restricting the lines
going back to the EC-2 with 1/16 inch plastic tube inside the vacuum lines and
adding an accumulator (3/4 inch tubing) downstream that is packed with
green nylon scrubby material to further dampen. One more of hundreds of
projects done. More to go.
Now for my next project.
My MP display on the EM-2 is not steady. Right now with a closed hanger,
engine off, no wind and all electrics off, except the EC-2 and the EM-2, the MP
bounces around. The average is about 24.7. But it jumps around
randomly. 24.9, then 24.6, then 24.8 then 24.9, then 24.3 then 25.1
then 24.6 then as high as 25.3. You get the idea. I have been
told that others, when in this condition, the MP is rock steady. The same
for when they are running at a steady throttle setting. That's what I
think I should be getting too. I also get this same thing happening when
the engine is running at all steady throttle settings. It happens on both
controllers. In the past, I just figured that this was normal, or close
enough as there were so many other more important things to work on, but with
the improvement in RPM with dampening, I'm thinking it is not. With the
dampening, the display is not bouncing around as much. I don't know what
it was as I didn't keep track. I would really like to have this airplane
as right as possible and I'm getting close. Now I am working on fiber
glass to permantly inprove cooling, waiting for new injector wire clips so I can
install the 86/87 550cc injectors and then of course, remapping. and a few other
things. So this would be an excellent time to also do what ever is needed
to make the MP steady and make this rotary installation as perfect as
possible.
Your thoughts as always
appreciated.
Don Walker
N113BR, RV-8
Renesis, EM-2, EC-2
Catto 76/88
3.5 hours Phase 1 in the pattern only
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