Quote: jlunseth
I am not going to chime in on the LOP v. ROP argument. I have been to the GAMI Advanced Pilot Seminar and have seen an engine run on their stand. Notwithstanding, I do not run LOP in my M20K 231 at this time. Why? Because the performance among the six cylinders is too big right now. I am going to try to get it tuned more optimally this winter, but by nature the M20K 231 does not have a tuned induction system. I have the Gami injectors, but they only partially solve the problem. My experience is that my engine seems to be tuned for a particular HP setting, somewhere around 65% (the cylinders will all peak at about the same time), but not at higher power settings. At 75% I have a fairly wide variation among the cylinders in terms of when they peak.
I am writing to say I hope you have an engine analyzer that reads each of the six cylinders, and that when you say you are 50 LOP you are talking about the richest cylinder (last to peak) being 50 LOP. If you are running with a one gauge set up, reading just the factory EGT and leaning from that, you could really be hurting your engine. Well, maybe not at 60% power, but then again maybe. The reason has nothing to do with the ROP/LOP debate and which side of it you want to be on. It has to do with the fact that if there is too much variability among the cylinders in terms of when they peak, you could be running some cylinders LOP and some right in the "red box," where you do not want to be.
GAMI's recommendation for degrees LOP in a turbo engine is basically 60-125 dF LOP. But they also make it very clear that you have to consider your engine as basically six separate engines, each one running at a different setting LOP or ROP, and you have to make sure that all six of them are in a safe zone.