Four stroke high r.p.m. internal combustion engine for racing purposes

Claim 1

IN A FOUR STROKE, HIGH R.P.M. INTERNAL COMBUSTION ENGINE WHICH OPERATES WITH SPARK IGNITION, A CYLINDER HAVING A CYLINDER HEAD PROVIDED WITH AN INNER SURFACE OF PREDETERMINED CONFIGURATION, A PISTON SLIDABLE IN SAID CYLINDER AND HAVING A DOME PROVIDED WITH AN UPPER SURFACE WHICH IN PART CONFORMS TO SAID CONFIGURATION OF SAID INNER SURFACE OF SAID CYLINDER HEAD AND WHICH AT TOP DEAD CENTER HAS SAID PART OF SAID UPPER SURFACE LOCATED CLOSELY ADJACENT TO SAID INNER SURFACE OF PREDETERMINED CONFIGURATION OF SAID CYLINDER HEAD TO PROVIDE SQUISH, SAID PISTON AND CYLINDER HAVING A COMMON AXIS AND SAID PISTON DOME AND CYLINDER HEAD DEFINING BETWEEN THEMSELVES A COMBUSTION CHAMBER WHOSE CROSS SECTIONAL AREA, IN A PLANE PERPENDICULAR TO THE COMMON AXIS OF SAID CYLINDER AND PISTON, IS SUBSTANTIALLY SMALLER THAN THE CROSS SECTIONAL AREA OF SAID CYLINDER AND INTO WHICH COMBUSTIBLE GASES ARE DISPLACED AS A RESULT OF SAID SQUISH AS SAID PISTON APPROACHES TOP DEAD CENTER, AND VALVE MEANS CARRIED BY SAID CYLINDER HEAD AND COMMUNICATING WITH THE SPACE BETWEEN SAID CYLINDER HEAD AND PISTON DOME FOR PROVIDING FOR FLOW OF GASES INTO AND OUT OF SAID SPACE AND FOR PROVIDING OVERLAP OF INTAKE AND EXHAUST BOTH BEFORE AND AFTER THE TOP DEAD CENTER POSITION OF SAID PISTON AT THE END OF THE EXHAUST STROKE THEREOF, SAID VALVE MEANS BEING LOCATED AT LEAST IN PART DIRECTLY NEXT TO SAID PART OF SAID UPPER SURFACE OF SAID PISTON DOME WHEN SAID PISTON IS AT TOP DEAD CENTER AND SAID VALVE MEANS PROVIDING FOR SAID PART THEREOF A POSITION WHICH IS SUBSTANTIALLY CLOSED AT THE INSTANT WHEN SAID PISTON IS AT TOP DEAD CENTER SO AS TO PREVENT COLLISION BETWEEN SAID PART OF SAID VALVE MEANS AND SAID PISTON DOME, SAID VALVE MEANS COACTING WITH SAID CYLINDER HEAD FOR PROVIDING FOR THE PATH OF GAS FLOW INTO AND OUT OF THE LATTER A CROSS SECTIONAL AREA LARGE ENOUGH TO COMPENSATE FOR THE SUBSTANTIALLY CLOSED POSITION OF SAID PART OF SAID VALVE MEANS AT SAID INSTANT OF TOP DEAD CENTER OF SAID PISTON.