I
am concerned about some sputtering that is present around idle. It is
generally
pretty smooth, but sputters too. Not sure what is causing it
yet.
Thoughts?
Don’t know
exactly you definition of sputtering, But could be a combination of factors,
including some mixture tuning required. My engine is smooth down to about 1500,
then begins to miss the occasional beat as I slow it further, and gets a bit
rough down at 1000. It might help if you can figure out why you have to ‘pump’
the throttle to make it slow down.
I don’t have a
clue about the RPM inconsistency, but
on the photo of the EM2 panel it looks like voltage is 11.1, but can’t
tell for sure. Did you not have the field current on the alternator? If
you tune the engine with the voltage at about 14.0; then run at 11, it will be
out of tune, and probably idle rough. This becomes more of an issue with the
small power wires and associated voltage drop.
Next,
in the documentation for the EC2, the diagrams and part of the
text
it shows that most of the wires should be run using 22 and/or 20
AWG
wire for the connections. However, in ONE place in the document it
states
that the power wire to the coils should be 16 AWG.
I don’t think
that’s an inconsistency, perhaps a misunderstanding. I think the 22
and 20 ga. refers to all the wiring between the PCM and the EC2; The power leads
to the coils and injectors are a separate issue. As Ed points out, there will
be undesirable voltage drop in a 20 ga, perhaps worse than Ed mentioned because
the peak currents, especially for the injectors, will be greater than 10A. I’d
also be a bit concerned about the heating in the wires enclosed in a tube;
although I’m not sure what the ‘average’ current is. If
it is 10 amps the 20 ga. is going to get warm up; which increases the
resistance, etc. I know it’s a PITA; but if it were me, I’d
bite the bullet and change to 16 ga.
Oh,
a final comment on progress. My cooling continues to impress me.
I’m impressed
with your cooling as well. Mine is good now, but I had to make a few
changes after first flight to get it there.
Poco a poco, se va lejos,
Al