Beautifully clean valves @By9468840. You have the injected engine whereas mine has a carb. I run it as lean as I dare but can’t go lean of peak as some cylinders would be too lean. I am really envious of your clean valves!
Below is one of my valve seats, I’m quite pleased about how clean they are!
Yes we should have a “EuroGA cleanest valves” competition 
just sharing some more pictures to contribute to the beauty contest.
But I have a question. One of my intake valves had a bit of oil around it. See pic.
I could not find any reference online indicating if it is a problem or not.. but curious what you guys think.
By9468840 wrote:
here is a sample of how my exhaust valves look like
Wow! What CHT’s are you running?
Peter wrote:
Yes we should have a “EuroGA cleanest valves” competition
With a scoring system (average hours, CHT, EGT, FF), otherwise fresh hangar queens get the prize
Will be interesting to see pictures of valves from a FADEC engine consistently run at 75% power output, this will reveal most of myths on how to “properly run” an engine?
I am almost certain a hangar queen would look far worse in boroscope than any other flying aircraft.
you’d be seeing corrosion and vertical scoring marks on cylinder walls.
Antonio wrote:
Wow! What CHT’s are you running?
I operate the engine almost always lean of peak up to 30-40 degrees. So the CHT are low. My cruise CHT of my IO-360 is 290-310 F @ 30 degrees LOP.
In climb I make sure no cylinder exceeds 380 F which they barely ever do. I also lean on the ground very aggressively. I lean it down to the point where the engine can barely run max 1200 rpm without sputtering. So pretty much the only time when I fly full rich is during take off.
Looks like these spots are quite common. I am also slowly learning how to use that chinese USB borescope…
This is an inlet valve
Your photos look very much like mine Peter!
I’m curious about that green coloration in the middle of hour exhaust valve. I watched a mike busch webinar at eaa website where he talks about green color on valve face indicating imminent failure but all of the cases he presented were on valve outer rim, not in the middle like yours. It is also interesting to know why some of the valves have that green center and others not.
I would drop him an email with this picture and see what he thinks.
