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