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EGT peaks
Jesse,
Do you find that the EGT's peak close to each other? I ask this in the understanding that in the standard injection system the fuel injected can be matched to the airflow of EACH individual cylinder. My understanding is that the EFII system injects the SAME amount of fuel to EACH cylinder, ie. not matched. Thanks. Johan |
2 cylinders peak early. Rob says that the injectors can be replaced with other injectors somehow to tune this out. I haven't looking into that yet.
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Software or hardware limitation on injector trimming?
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I would think that they might be paired, but not all injectors on one driver since they typically have a trigger amperage that drops to a hold amperage for operation. Maybe too deep, and EFII should answer. |
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Hmm. Should be able to bench check a given injector, then bench check a selection until one with more or less flow (as desired) is found. A quick spin with Google says there is a whole cottage industry out there flow matching injectors, so the services are available. |
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I've been puzzling over this for a couple days now, and reading all kinds of articles on engine operation. I'm just not really familiar with the details of piston engine operation and theory beyond the absolute basics. Props were only briefly mentioned in school, and when they were they were always turbine-powered; the only engines I ever messed with were .40-class and .049 2-cycle RC ones. |
Typically, a linear interpolation is done between map points.
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Jesse,
Thanks very much for the detailed write up. From what I know, the set up is not really as involved as you mentioned. I've seen the spreadsheet for the data points and I recall it only being 2-3 pages. Yes, it was my engine on the dyno at Barrett, and we certainly didn't get a chance to tweak anything or dial it in. It was still a good learning experience and I got to dive into the programmer. Either way, we are all headed into uncharted territory and there's bound to be a learning curve. I had previously spoken to Robert about setting up a database that we can all share our data and settings with one another and post our results. I know there's one other guy a few weeks out from being where you are and I'm right behind him. So by this summer, we should have enough data to start seeing some averages. I'll pm you directly with a bunch of specific questions. Nice work though.... Gotta love how smooth it runs. |
Is that my project?
Hey Jessie, is that my project you talk about the one with EFII, as I had that already with my RV-10. Hope that it is all positive.
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RV=12 Viking enging system
I,m installing a VikingAircraft engine (Honda) in my RV-12. Dual batteries (EarthX36) plus standby, battery for the Dual G3X touch, Dual fuel pumps, Dual EII, Dual controls and switches. Thanks for your report.
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