This Erickson FE200 (MCC) prototype migrating combustion chamber engine was manufactured by Erickson Motors, Indiana, circa 1993. The engine is 9”-long, 8”-wide, and 7”-high. This engine has a square piston inside a square cylinder. Both migrate about the crankcase as it rotates. The piston slides up and down inside the cylinder as it slides left to right inside the crankcase.
The migrating combustion chamber allows this unique engine to take full advantage of the gas expansion after combustion. By the time the exhaust is released to the atmosphere, it has expanded to its fullest and is almost completely depleted of pressure. The exhaust temperature is not much higher than ambient air.
This 200cc prototype was CNC machined from bar stock. Later production engines were made smaller (120 cc) and made from castings.