Hello guys

Well, this is one the reasons why I am thinking of replacing my engine with a turbine lol

Anyway, we are scratching our heads here. We found (looks like lead) deposits inside the cylinder and on top of the pistons. It is pretty soft, some parts are harder (probably baked) and you can actually take a harder sponge and start cleaning lol

But why?? Why did this happened?? I mean I am thinking I am always driving my engine according to the 'gospels', Full rich in climb and take off, never over powering (using MAP 31-34 in climb), then level off, go back to MAP29, lean to 16.5, bump it up to MAP31-32 with approx. 18GPH/2500 RPM

Always checking for CHT, (cruise temps are approx. 370), TIT=1610

So.....then suddenly my EGT (not CHT) starting to act up, and showing a HOT warning, me adding mixture to full rich, EGT back to normal, this happened twice on the same cylinder, so I requested a borescope and found this.....so we pulled the jug.

Now I can pull them all, clean them all, and wait for the next time?? Why could something like this happen? (I even heard someone telling me that I was leaning too much??)

Any idea ??

Thanks -- Ronald

ps Pict 3 showed some of the stuff that we were able to scrape off, and in the upper left corner you see the hot spots, they are colored but the 'skin' feels the same, so it looks like material was coming off or burned in, but it is not, it is the deposit on top.