There is some basic info at
http://www.lycoming.textron.com/main...ticEngine.html
More detailed info from the Type Certificate Data Sheet, eg # 1E12 at
http://www.airweb.faa.gov/Regulatory...e?OpenFrameSet
Some useful info here:
http://home.adelphia.net/~aeroengine/Lycoming.html
Of course, there is what happens when you fit the Christen system to an ordinary engine (Experimental unless per one of the few STC's):
http://musclebiplane.org/htmlfile/invert.php The Lycoming inverted oil system fitted to the AE series is basically the Christen system' however there are additional mods to the AE's.
Finally, another Experimental option is the Maxi-Sump
http://www.skydynamics.com/homepage.html