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Chris (and all)
Remember that right now, in stock setup, the EC2 is set up to drive both pairs of fuel injectors as if they were the same type/size. In our installation the primary fuel injectors are in the 500 cc range, where the secondaries are in the 1500 cc range. I have to research to get the exact value, but the fine details are not important.
What IS important is that as the EC2 reaches its staging point, it currently thinks all 4 are the same size, and so it has them open/flowing at equal amounts of time. This means that above the staging point, we will be running significantly rich because the big injectors flow 3x as much fuel. There is a tuning process to allow this to be evened out. Once we have the autotune accomplished at the lower RPM's, particularly right below the staging point, we then need to go to the mode that allows the injector offset to be adjusted. The oxygen sensor can give us the picture if we are at best/cleanest mixture, and we adjust the injector flow rate for the secondaries until the readings are equal/similar both above and below the stage point.
As for RPM, remember that we have an adjustable pitch propellor, and that we can lower and raise our static RPM numbers by adjusting the propellor. So in theory we can get redline RPM at a standstill if we have the engine tuned and prop at fine pitch "low gear" setting. We also can get very low Idle RPM/Power by keeping the pitch fine, and the Manifold Pressure low. I would think an ideal IDLE power setting would be where the plane does not require braking to remain still, and heat generation/temps do not outrun our cooling ability on a hot July day in Texas. Under 1000 is good, but if we can idle smooth a little lower then I really dont see a problem there. 800 would be nicer. I think the 400 we saw last month is probably too low, and I've read that if we get toooo slow we may set ourselves up for vibration/resonance in our gear train (not a design fault - since we normally dont idle that low anyways)
Dave
Christopher Barber wrote:
Ok, I know I have read about this somewhere, but not sure where or what I read means, but I finally ran my engine up to full power and was wondering what kind of numbers I should be seeing.
Even though I had some intermentant wire issue (SUPRISE) in that as I got over about 4500 rpm the rpm would flash in the hundreds and then go to zero. When I throttled back to below 4500 ish, the reading came back. This happened a few times.
However, later when I did it, the readings were better and I was able to run the rpm up to about 5500 rpm at full power on the Mistral Intake (so about 2534 rpm at the prop). It seem to reach full rpm at about 3/4 (to 4/5) of full throttle and then mostly stablized. Sounded smooth even though I am still running rich. It seems to run much better with the mixture at about 9 oclock and bogs as I bring it to the noon position. In auto tune it seems to be trying to lean but kinda slow and if I try to keep it at the 12 oclock position it seems too rich, so I think I will need to do some manual leaning and then go back to the autotune. I am idleing pretty smoothly at about 1000 rpm.
Is this RPM range acceptable? Is this good; bad? What should I expect? I was nervous to run it up like this, but I just kept telling myself that I am not gonna be throwing a rod or blowing a jug <g>. If you remember I do not have coolant temp reading right now, so I closely monitored the oil temp and kept the run short, but I was curious as to what I could run it up to. Thanks again.
All the best,
Chris
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