Internal combustion engine with improved combustion

The present invention relates to (with reference to Figures 1a to 1h) an internal combustion design which allows for enhanced control of the fuel-air mixture and complete exhaust of combustion gases during the exhaust stroke. The internal combustion engine does not require that the combustion gas outlet valve (9) enter into the cylinder (1) to allow combustion gases to exit the cylinder (1). The ring valve or valves (9) can either reciprocate or rotate. The engine includes a variable-length piston rod (7, 8) manufactured in two parts (7, 8) which parts (7, 8) can reciprocate relative to one another along their length. A spring, either mechanical or pressure-operated, or the inertial masses of the parts (7, 8) may be used between the piston rod parts (7, 8) to control the reciprocation of the parts (7, 8) relative to one another. During the compression stroke of the piston head (5), the piston rod parts (7, 8) are retracted relative to one another so that at the top of the compression stroke the piston head (5) does not reach the top of the cylinder (1), thereby creating a combustion chamber (11) in the cylinder. During the exhaust stroke of the engine the piston rod parts (7, 8) are extended relative to one another, so that at the top of the exhaust stroke the piston head (5) reaches the top of the cylinder (1), eliminating the combustion chamber (11), thereby completely exhausting all combustion gases from the interior of the cylinder (1).