They made an engine that has not been installed on any aircraft, but was built with that intention around 1924. It featured innovations for the valve system: the intake valve was in the center and it had several exhausts valves around it, like a daisy. It had a Zenith carburetor and gave 25 CV at 1,600 rpm.

"Armhor engine"

-Its other uniqueness was that the cylinders were offset from its axis relative to the crankshaft, likely to deliver more linear power in a stroke.