I have an RV-8A (2004) with factory new Lycoming O-360-A1A and 575 hours. Typically when I see borescope pictures on the site, the valves look clean and it is easy to see heat damage. I have attached a few pictures of my recent borescope and I’m not sure what to make of them. Looks like lots of lead deposits. All 4 cylinders look about the same. I’ve started adding TCP to the fuel, but doubt it will undo the buildup. For the engine experts on the site, any recommendations going forward? Just continue to fly, and continue with borescope and compression each year? Remove cylinders and clean off deposits? Other?
Compressions are all good, and the engine runs great. I have always aggressively leaned on the ground, in climb, and run at peak EGT in cruise (any leaner and the engine runs rough). I have run the engine a lot at low power (40%-50%) in cruise, and in the winter the cylinder heats are in the 275F-325F range. Not sure if one or both of these are causing the buildup. Any thoughts on root cause would also be appreciated.
Aaron
Compressions are all good, and the engine runs great. I have always aggressively leaned on the ground, in climb, and run at peak EGT in cruise (any leaner and the engine runs rough). I have run the engine a lot at low power (40%-50%) in cruise, and in the winter the cylinder heats are in the 275F-325F range. Not sure if one or both of these are causing the buildup. Any thoughts on root cause would also be appreciated.
Aaron
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