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List,
Thanks for all the great suggestions from my "Not getting full power" post. Concerning the RPM dropping out above 6000 RPM. This weekend I dropped by my local FBO. They didn't have any #12 aircraft wire, but after describing what I was trying to do (eliminate electrical noise) he suggested #16-2 with shield. I installed it by tying both #16s together and running it from the battery to a 5 amp breaker and then onto the EM-2 and EC-2. Grounded the shielding near the battery and not on the other end. I also moved my high power wires to the injectors and coils away from other things. I know that is bad engineering, doing 2 changes at once, but it was easy to move the wires at that time. Fired it up, ran it at a fast idle, and turned injectors on and off. The RPM stayed on with the secondaries off, and got squirrelly with the primaries off. Similar situation at full throttle, 5880 RPM or so, so I think I have that licked. The proof will be in the air. Thanks Tracy and all the rest of you. Sunday I got thinking about the MP pressure being all over the place. The local RV guru told be that he couldn't get his analog MP gauge to be steady until he drilled a 1/16th inch hole in a rivet, and put it in the line as a dampener. I thought, that's easy to do! I noticed that the spout on my oiler is a small diameter, so sticking a drill bit in it, found it was 1/16 inch. I cut off 2 inches and inserted a piece in each manifold line, Tightened it down and fired it up. 6080 RPM! When a wind came up, it read 6150 for a short time. More than I have ever gotten on the ground. HP display ever read 147 HP! And the MP had settled down. Exhaust gas temps are not as high, they are closer together, but still about 150 f different.. My theory is that with the MP being all over the place. The EC-2 computer, doesn't know what to do, so is switching back and forth to different MAP addresses as they come up, trying to do it's best. With the MP, much steadier, the EC-2 can do a much better job. This also seems to explain why the auto-tune never worked. I'll give that a try soon. I am working on dampening the pulses down further. Tonight, I installed 5 inches of the 1/16th inch tubing. Still bouncing around some. I made a dampener consisting of a green scrub pad, rolled up very tight, stuffed in a 5/8 inch plastic tube with barbs on both ends and installed between the 1/16 inch tube and EM-2. At 2000 RPM it bounces around between 10.1 and 10.4. At full throttle, it bounces around a little more 24.5 to 25.1. One other thing I noticed, is that with the engine off, all other electrical off and only the EM-2 and EC-2 on, in a closed hanger, a cold beer in hand, the MP bounces around from 24.5 to 24.8. Oh, and my true airspeed reads 14 MPH on the EM-2 when every thing else is turned off. Is all this normal? Sorry, but I no longer know normal. What are the rest of you getting? Is it possible to get the MP rock steady? 5000ft elev, 75 F
In reference to the guy who was asking about fuel pressure, I set mine for 38 PSI. Recently, I hooked up a Vacuum line from the manifold to the pressure regulator. As Idle, the pressure is now about 34 and a full power, about 39 psi. This has messed with my mixtures, but I will go back and remap, and will try auto-tune. The Rotory gods are almost smiling.
Don Walker
N113BR RV-8
Renesis, EC-2 EM-2, 2.85 PSRU
Electric seatcovers, Power ashtray
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