Internal combustion engine

Claim 1

AN INTERNAL COMBUSTION ENGINE COMPRISING A CYLINDER HEAD, A CYLINDER BLOCK SECURED TO THE CYLINDER HEAD, A CYLINDER DEFINED BY THE CYLINDER HEAD AND CYLINDER BLOCK AND HAVING AN AXIS, A PISTON SLIDABLE IN THE CYLINDER ON SAID AXIS, MEANS DEFINING A PRECOMBUSTION CHAMBER IN THE CYLINDER HEAD, A DOME-SHAPED WALL IN THE CYLINDER HEAD FORMING A SUBSTANTIALLY HEMISPHERICAL COMBUSTION CHAMBER IN THE CYLINDER, A TRANSFER PORT PROVIDED IN THE CYLINDER HEAD IN A POSITION OFFSET FROM SAID AXIS AND HAVING AN AXIS WHICH IS SUBSTANTIALLY RADIAL RELATIVE TO THE SUBSTANTIALLY HEMISPHERICAL COMBUSTION CHAMBER AND PUTTING THE PRECOMBUSTION CHAMBER IN COMMUNICATION WITH THE COMBUSTION CHAMBER, THE TRANSFER PORT HAVING A SUBSTANTIALLY FRUSTOCONICAL SHAPE WHICH IS DIVERGENT IN THE DIRECTION OF THE COMBUSTION CHAMBER, A MOUTH PORTION CONNECTING THE DOME-SHAPED WALL TO THE TRANSFER PORT, THE MOUTH PORTION HAVING A PERIPHERY WHICH IS RADIUSED IN THE REGION OF THE MOUTH PORTION ADJACENT SAID AXIS OF THE CYLINDER SO THAT THE TRANSFER PORT MERGES INTO THE DOME-SHAPED WALL IN A DIRECTION TOWARD SAID AXIS OF THE CYLINDER, THE PISTON HAVING A SUBSTANTIALLY HEMISPHERICAL DOME-SHAPED UPPER END, AND A DEFLECTING RECESSED PORTION IN SAID UPPER END WHICH EXTENDS FROM A REGION WHICH IS IN ALIGNMENT WITH THE TRANSFER PORT AXIS IN THE TOP DEAD CENTER POSITION OF THE PISTON IN THE CYLINDER TO BEYOND SAID AXIS OF THE CYLINDER.