Combustion chambers for pistons

Claim 1

IN A PISTON FOR A SELF-IGNITION INTERNAL COMBUSTION ENGINE, SAID PISTON HAVING A COMBUSTION CHAMBER WHICH OPENS THROUGH THE PISTON HEAD WITH A CROSS-SECTIONAL AREA LESS THAN THE CROSS-SECTIONAL AREA AT THE BOTTOM OF SAID CHAMBER FOR RECEIVING SUBSTANTIALLY ALL OF THE COMBUSTION AIR IN THE CYLINDER AS A UNIDIRECTIONAL AIR SWIRL IN SAID CHAMBER DURING THE PISTON COMPRESSION STROKE, AND FOR RECEIVING A FILM OF FUEL ON THE COMBUSTION CHAMBER SIDE WALL, SAID FUEL BEING SUPPLIED FROM A NOZZLE OFFSET FROM THE CENTER OF SAID CHAMBER AS A SOLID UNATOMIZED JET DIRECTED TANGENTIALLY OF THE COMBUSTION CHAMBER WALL OVER THE SHORTEST POSSIBLE PATH, THE FUEL THEN BEING VAPORIZED FROM SAID WALL AND MIXED WITH THE COMBUSTION AIR, THE IMPROVEMENT COMPRISING A CHAMBER OF LARGE VOLUME RELATIVE TO ITS HEIGHT AND FORMED AS A BODY OF ROTATION WITH SAID SIDE WALL CONVEXLY CURVED TOWARD THE CENTER OF SAID CHAMBER, A CONICAL BOTTOM SURFACE WITH AN APEX POINTED TOWARD THE CENTER OF SAID CHAMBER, AND A CURVED WALL PORTION EXTENDING BETWEEN SAID SIDE WALL AND SAID BOTTOM.