Self-supercharging dual piston engine apparatus

Dual piston self-supercharging internal combustion engine apparatus comprising, in combination:

• cylinder means;
• a cylinder head secured to the cylinder means;
• piston means including a first piston in the cylinder means and a second piston in the cylinder means connected to and moving with the first piston;
• a combustion chamber in the cylinder means between the cylinder head and the first piston;
• a bulkhead disposed between the first and second pistons;
• supercharger chamber means in the cylinder means adjacent the bulkhead means;
• a plurality of intake ports extending through the cylinder means and separated from each other axially and communicating with the supercharger chamber means for providing a flow of air into the supercharger means in response to movement of the piston means;
• a plurality of reed type check valves for controlling the flow of air into the supercharger chamber means through the plurality of axially separated intake ports;
• transfer manifold means extending from the bulkhead to the combustion chamber for transferring air from the supercharger chamber means to the combustion chamber;
• aperture means in the bulkhead communicating between the supercharger chamber means and the transfer manifold means;
• and
• reed type check valve means for controlling the flow of air from the supercharger chamber means into the transfer manifold means through the aperture means.