Planepnder Apology accepted with thanx. Re the complexity of the system, I run a lot of planes in the 40 to 90 range. Not many or no engine of this size comes with con rods able to tale low oil. Machining and converting to roller bearings would be more difficult for me with my limited skills and lack of equipment. Machining the backplate is within my capabilities and NO mods to the engine are necessary.

Dogshome. & avi8tor Good idea about using an inline check valve. Thanx for agreeing with me re filtering.

Videos coming, have to get the fuel thing solved first.