I just got this brand new WWII Surplus Oil Separator off eBay. The instructions state that it is cyclonic and was for an old airplane. Haven't installed it yet but looks like it will work OK. I noticed that the seller had several for sale at the time. The one I have from a 240D? is leaking from the top and doesn't appear to be of real high quality or have a very high flow rate.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=2493390905&ssPageName=STRK:MEWN:IT