alpinelakespilot2000
Well Known Member
I've got just over 40 hours now on my O-320 and have noticed a little bit of soot buildup in my exhaust pipes. Not a ton, just enough to be visible and felt. It's gray in color. I'm not exactly sure when during the first 40 hours it built up, whether it was during the first 15-20 hours when I wasn't leaning very much for break in, or whether it's continued since then. I couldn't find much about this in the archives. What causes this and should it be something I am concerned about?
Left pipe:
Right pipe:
Thanks.
Left pipe:
Right pipe:
Thanks.
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