Hi,

Well, actually a similar idea is currently used by YS engines. The carburetor is not open to air but connected to crankcase. As the piston goes up, air comes into the crankcase from outside and as the piston goes down, the pressure is used to push air into cylinder. They have disc valve on cover-plate to make airflow directional.

By this mechanism, YS engines have about 20% more power compared to other engines of same size. The famous FZ91 model still has air chamber attached on the cylinder head. FZ120 does not have one but instead it uses inside of cylinder head to get some space.

OS engine once had a model FS120SP which was also equipped with supercharger. Seems they are now working on 140 model to beat YS FZ140 or the strongest DZ140. I doubt if it is possible but if they really make one THING customers will be pleased again. Especially the F3A competitors.

Good luck!

Michael