I was in Oklahoma City for the past week and a half and one of the places I visited was the Science Museum of Oklahoma. There is an aircraft engine that was donated to them but there is no information about it and they are seeking assistance in identifying it; manufacturer, type, specs, etc. I've downloaded a shot of the display request and two photos. Here is the information they have:
http://www.airport-data.com/aircraft/photo/303863.html
There is a correction to this information. It is NOT a rotary engine. One of the volunteers there is an 80-year-old aeronautical engineer. He took an endoscope to it and discovered it has pistons with ports but no valves.
http://www.airport-data.com/aircraft/photo/303864.html
http://www.airport-data.com/aircraft/photo/303865.html
If anyone knows anything about this engine let me know, and I have the e-mail and contact for this engineer.