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what is the consesus on the length of the overboard tube for crankcase vent, after oil seperator. I currently have 3/4 in dia about 6--7 in outside cowling, on left side, maybe 6 in to left of lh exhaust pipe. wish to get rid of some more oil smudging on belly if possible. would the dia of the overboard pipe make a large difference? engine appears to be broken in as no decernable usage of oil over 6 or 7 hours. running great otherwise.

Joe, the pipe coming from my separator extends only about one inch below the cowling. It has always been dry indicating the separator is doing its job. When I empty the separator at oil changes it amounts to an ounce or so...never measured it.
I talked to Kerry about which way the tube should be cut...facing forward or aft. He said avoid positive pressure so mine is cut at a slight angle, maybe 15-25 degrees and facing aft so as to make a negative pressure so fluid would be drawn out of the separator.

Thanks for the response! I have my pipe way lower that one inch, but do have the rear slice installed, but at more like 45-60 degrees. I will change the length to be 1 inch below the cooling outlet of the cowling. Is that inch measured from the fiberglass, or the seaplane lip lower edge?

...measured from the bottom aluminum panel, the panel where your feet would be right above. I'm not sure what is the "seaplane lip lower edge" .

Darick wrote:...measured from the bottom aluminum panel, the panel where your feet would be right above. I'm not sure what is the "seaplane lip lower edge" .

To prevent my stumbling with verbage, try going here for a good explaination of seaplane lip:

http://www.cessna170.org/forums/viewtop ... 7&start=15

And, the general idea does work well. my "lip is about 1.5 in, at roughly 45 deg aft tilt.