To tell the truth I'm a little worried about the leave of knowledge. It's apparently that even though I been doing this a long time never had a problem I been doing it all wrong.
Nothing I've said should be taken as "you're doing it all wrong," because I did not mean it that way. You may be a very fine mechanic/LAME. It's possible I might even bring my airplane to you for work. The finest mechanic I've ever known was a fellow named Greg Doyon at the Tacoma Narrows airport (TIW) near Seattle WA, USA. At first, I flew about 50 miles to get my annuals and other work done for about 10 years. Later, when I moved to California, it was nearly 1,000 miles, but I still had my annuals done by him. I did the "Owner Assisted" thing, and learned a great deal from him. In 15 years he never made a mistake, and turned out flawless work.
He was adamantly opposed to LOP, and when I told him I was going to have my V-35B upgraded to the Tornado Alley Turbo-Normalizer he desperately tried to talk me out of it. He grumbled a lot about it after it was done, but then admitted it was well done. He said, "Well, at least you won't be running LOP with it!" I smiled, and said, "That engine and Turbo has 250 hours on it, ALL of which was about 90℉ (50℃) LOP!, about 90% power." He was dumbfounded, speechless.
Later, I took him along for a demo flight and leaving the throttle wide open, the RPM full, I pulled the mixture briskly back to about 17 GPH (64 LPH). CHTs were all nominal, and less than they'd been ROP. The airplane was going like stink, about 190 knots TAS at 2,000 feet.
He fell right into my trap, saying, "Your IAS is well into the yellow." So I pulled ONLY the RPM back to 1800, leaving the throttle WOT. He nearly lost it, eyes bugged out, protesting. CHT's were down even more, of course.
He wasn't convinced yet, but he sure was puzzled, because it flew in the face of everything he "knew."
But it was based on science.
Sadly, that was the last annual for N1BE at that shop. Greg had a growing family, and had to take a job teaching at a local college, for MUCH higher pay. The plight of mechanics everywhere.
Where I have a problem with you, sir, is your foolish THEORIES about the damages you're seeing, and the ill-founded advice you're putting out here, and presumably elsewhere. You investigate, find the problems, and repair them. That's all well and good, and I salute you for it. THAT is your job, and I could not do it. But when the SCIENCE is presented, you blow it off with your version of the OWT (Old Wives' Tale.) You really do yourself and others a major disservice.
I think you also ought to let a spell-checker help you out, but that is just my opinion!
Best...
John Deakin
Camarillo CA