Air cooled self-supercharging four stroke internal combustion engine

A four stroke internal combustion engine comprising:

• an engine block with four piston cylinders, wherein said piston cylinders are arranged in first and second side-by-side pairs with each said pair straddling a longitudinal axis of said engine block;
• a first combustion chamber associated with said engine block and extending laterally to said longitudinal axis;
• said first combustion chamber being open to a first one of the pair of piston cylinders in the first side-by-side pair, and a first one of the pair of piston cylinders in the second side-by-side pair;
• a second combustion chamber associated with said engine block and extending laterally to said longitudinal axis;
• said second combustion chamber being open to a second one of the pair of piston cylinders in the first side-by-side pair of piston cylinders and a second one of the pair of piston cylinders in the second side-by-side pair;
• a crank case associated with said engine block below said piston cylinders;
• four pistons with one piston in each of said piston cylinders, said pistons synchronized to move up and down in unison;
• and draw four cylinder volumes of intake air into the engine;
• a first intake valve associated with the first combustion chamber;
• a second intake valve associated with the second combustion chamber;
• a first exhaust valve associated with the first combustion chamber;
• a second exhaust valve associated with the second combustion chamber;
• and
• wherein on consecutive piston upstroke, said first and second intake valves alternate in charging said respective first and second combustion chambers with intake air, and on consecutive piston downstrokes, said first and second exhaust valves alternate in exhausting gases from said respective first and second combustion chambers, thereby providing a 2:1 compression to the intake air alternatively charging the first and second combustion chambers.