Hang in there, Don
Most of us have experience similar frustration - if
with perhaps different problems.
Here is one thing I can think of. You stated it
does not buck with the secondary injectors disconnected. Do you have
the injector disable switches installed? When you say disconnect
- I presume you mean unplug the electrical connectors - or is turning
off power to the secondary with the disable switch??
In any case, here is what I would do, I would
disconnect the electrical connection to the primary injectors - pull the
electrical connector off the primary and plug them into the secondary
injectors. Turn the secondary disable switch off. IF the engine
runs fine with the secondary now then you have shown that the
problem is not the secondary injectors. If it still bucks then
you could have a bad injector.
I used to have a bad stumble when the secondary
injectors were turned on by the EC2. I had though it was too rich as
well, but when I finally hooked my EFSIM monitor and could see the air/fuel
ratio indictor as well as the bars of the fuel map. I found out it was
going too lean, enriching (increasing height of fuel map bars) eliminated
the stumble.
I don't have an EM2 so can't help you with why it is
intermittent in displaying pressure.
But, try switching injectors wires and if you
do disconnect (as opposed to disabling with the disable switch) remember
that the EC2 has no way of knowing the two you disconnected are no
longer connected. So you need to place the disable switch to
off(ground) for whichever set of injectors you don't want operating for the
test. Otherwise, the EC2 will still assume all 4 injectors are ready
to fire and it will reduce the pulse width to the injectors by 1/2 when it
goes from two to four injectors. If only 2 injectors are connected
then you will only be 1/2 the fuel to the engine that it needs. By
using the disable switch to turn off one of the pair, the EC2 will
automatically double the Pulse width to the two remaining injectors.
So if you are only using two injectors with one pair
disconnected, you should turn the disable switch to off for the disconnected
pair.
Hopefully someone else can provide more helpful
suggestion
Ed
----- Original Message -----
Sent: Thursday, February 28, 2008
8:23 PM
Subject: [FlyRotary] staging
The list has been a little quiet lately, so
here goes. I'm the guy who couldn't get his Renesis going. Turns out
a capacitor was missing for the EC-2. Then it would only start on a
rare occation. Turns out it needed a 1000 ohm resistor across the
CAS line as noise was changing the timing. Now, Stageing is
difficult. Auto tune isn't really working and I have resolved that I
will do it manually. It kind of works, but takes a long time and
it's easier to just do it manually. My suspicion is that the
manifold pressure is not holding steady enough, but now I am not so
sure. I even added 2 ports near the throttle body, but it is still
erratic. Even teed them together with the back ports. Now back
to staging.
I get up to 19 inches, the staging *
turns off and the engine start bucking. Tryed mode 6, setting for
larger injectors (I am running stock renesis 295 primaries and 610
secondaries) Still bucks. Tried mode 6 turning down flow
rate. At about 20 inches I was able to get it to even out, but it
still bucks at 19, 19.5 and it bucks so bad that I can't get it to
21. I assume it is flooding as I was able to get it to run at 20
inches, but can't get it to change at any other setting. The EM-2 is
erratic. The grafical mixture moniter, works and displays most of
the time at lower manifold settings, but the higher the setting, the less
it displays. At 19 inches, it only displays about 5% of the
time. Kind of hard to set things if I have no feedback.
Even stuck in a new O2 sensor to no avail. I can't run it
long at these power levels, as I quickly get to 210 degrees. My suspicion
is there is a root cause of all this EM-2 erratic displaey stuff. My
very uneducated guess is that electical noise is causing all these
problems. Your thoughts?? Solutions?
To add more problems, at high temps, I heard
a squeel, then it stopped. Then it happened again. I didn't
know what it was, so shut down. Couldn't get it restarted.
Pumps sounded funny and no fuel pressure. Seems pumps over heated
and cavitated as 5 minuets later, they started working. They are
shielded and with a cool tube blowing on them. Apparently not
enough. Your suggestions are very appreciated. Tracy???
Oh, yeah. If I disconnect the secondary injectors, it won't
buck.
Don Walker
Frustrated RV-8 renesis builder
Now I'm e-mailing the Dynon list to find out
why it won't display GPS
data