Disuse is the biggest enemy.6555 wrote: ↑Sun May 12, 2024 11:06 am I also have the same issue but with several cylinders . I have not been flying my 140 much and had 1 great cylinder a couple in th 50s and one in the mid 40s. I am thinking of selling my 140 and it was running fine and the borescope was good on all 4. I haven't flow much , 15 hours last year, but I am thinking I will get crushed on a sale with low comps. It's been a great running machine and my A&P say go run it hard and we will check again.
Its a 1400 hour engine and I may have to do a top OH, I have been getting good oil analysis reports so I figure the bottom end will easily make TBO of 1800 and figured I could go to 2000 if the reports were good. I change oil/filter ever 25 hours...any thoughts?
I topped a leaky (from the pushrods mostly) 800 SMOH engine last year and now it purrs. But it flies about 100-130 hours a year. That's pretty much the only secret to longevity, at least in hours. If/when you top it you can get a pretty decent look at the lifters and cam, which will be informative.