romair Posted April 6, 2015 Report Posted April 6, 2015 I have an MVP-50 monitor on my mooney so now I can monitor my engine in a lot more detail than before. For those of you with digital engine monitors, how much fluctuations do you see in your EGTs during the cruise part of the flight. I am attaching a picture of a random 40 minute period during cruise. I am not sure if the fluctuations I'm seeing are normal, or if there is some interference. I am pretty sure it is not the engine, and I am already chasing some other fluctuations in the system. The EGT fluctuations are not severe at all, yet it is not rock steady either. Thanks Stefan Quote
kmyfm20s Posted April 6, 2015 Report Posted April 6, 2015 Go to the EGT/CHT bar graph setup screen. Make sure it is taking a reading every .3 secounds it helps getting a better average reading and smooths out the lines. Page 35 in your EI manual. Quote
N201MKTurbo Posted April 6, 2015 Report Posted April 6, 2015 Life was so much simpler before engine monitors. If the factory gauges were in the green and the engine sounded good there wasn't anything to worry about. 1 Quote
kmyfm20s Posted April 6, 2015 Report Posted April 6, 2015 Life was so much simpler before engine monitors. If the factory gauges were in the green and the engine sounded good there wasn't anything to worry about. But then what would we talk about......politics? 1 Quote
carusoam Posted April 6, 2015 Report Posted April 6, 2015 "Life was so much simpler back then. Only problem was, it was simple..." (My college room mate) At one point in the graph... The EGT readings all drop at the same time...then return...? The oscillations are small overall accept the set of negative peaks. Temperature probes generate signals in mV. They are sensitive to grounds integrity and things like that... Or did something bump the mixture at that moment in time. 1:30 and 1:38 on the time scale... Expect a few degrees oscillation to be of the noise variety. When the EGTs drop for no apparent reason, you have something to look for... In this case it may be instrumentation or FF related. My thoughts, shared, -a- Quote
Shadrach Posted April 6, 2015 Report Posted April 6, 2015 After leaning, I believe my EGTs fluctuate +/- ~8 degrees on each cylinder. Peak remains at the same number, but if I set the engine there EGT will fall off one side or the other slightly. Quote
Shadrach Posted April 6, 2015 Report Posted April 6, 2015 Was this whole thing taken in cruise at a constant power setting? Can you change the scale a tad. There's a lot of visual noise here created by variances as small as 3 degrees. Quote
romair Posted April 7, 2015 Author Report Posted April 7, 2015 Was this whole thing taken in cruise at a constant power setting? Can you change the scale a tad. There's a lot of visual noise here created by variances as small as 3 degrees. This was taken at cruise, constant power setting. I am attaching the entire flight with FF, then another zoom into it with the FF. As you can see, the FF has significant oscillations, which I believe are instrumentation related. I'm now wondering if the oscillations in the EGTs are normal, or also related to a common cause. Quote
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