Recent content by Morgan3

so, with pumping losses, heating, and other issues, is there a net gain with the boost provided?

There is a four stroke Model Airplane Engine made by Yamada (YS) that uses a rotory valve in the back of the crankcase to compress a fuel/air mixture for two rotations in the valve cover, before it is admitted by the intake valve. The fuel contains oil which lubricates the bottom end...

Thanks Pantaz, I am a member of that group. My engine uses parts from this engine in completely new ways. Jack, thanks, this is a little epiphany. I have been a student of the history of aircraft engines and have never understood the evolution from long stroke slow turning engines to the...

Thanks Jack, I'm confused about the piston area and the total displacement. The difference in displacement between the stroked and unstroked engines is 210cc or about 15%. I understand that the velocity through the valves will be the same, but won't there be 15% more air/fuel mixture to...

Thanks for your concern Ranger Mike. I couldn't agree more. This is a rescearch project that will be proved on an airboat. Worstcase I have to row to the shore. There is no room in the OPEM case for any tinkering. My project uses a new crank concept and cast crankcase. I'm using the A084...

The Govt. Surplus GenSet engine A084 is a four cylinder, four stroke, 1390cc/84cu.in. aircooled flat four with a 3 in. bore and a 3 in. stroke. It was made by the thousands by Hercules and resembles a Lycoming shrunk in the dryer. It has been converted to experimental aircraft use and faily...