flyrotary@lancaironline.net Mailing List Archive

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With the staging point set above 15”; and having both sets of injectors operating at manifold pressures of 10-12”, it seems quite clear that the “staging” is not working. The $64 question is “Why not?”

Unless you have a scope on a pressure transducer, you can't be sure the MAP doesn't ever pulse above 15". I'm assuming the EM-2 shows us about 1 out of 100 pulses that the EC-2 measures, and your analog gauge ain't fast enough to see everything. Setting the transition to some really high point might be a waste of time, and you probably need that 30 seconds for something more important :-)

I understand what you are saying, but it would suggest that the engines would also not idle in a car; and that Dave Leanard’s engine couldn’t idle smoothly at 900, as he says it does.

I don't buy the need for small injectors either, but my point was that if an injector was sticking a little, it would be worse at idle. Of course it would be bad in the car too, maybe worse. If you think about it, we probably need a lot more fuel to idle with the prop load than a car does with the clutch in.

The relay that is utilized by the EC2 to disable the secondary injectors at MAP below the stage point.

Do you have a relay external to the EC-2? A 13B doesn't have anything like that, but I can imagine that running 3 injectors might exceed the current rating of the internal EC-2 circuit that was designed to run only 2 injectors.

With your firewall plugs, can you swap primary and secondary injector wires. If you can come up with a way to do that, it might help determine if you have a leaking/sticking injector, vs some sort of electronic gremlin. I ended up cutting all my injector wires early in my original installation, because I needed to be able to do this sort of test. Now (finally) I have matching injectors, and equal length wires to each, so testing is much easier.

Good luck. If you're looking for trees to cut up, come on over :-)

Rusty (X prize claimed- Go Rutan!)