Internal combustion engines

Claim 1

AN INTERNAL COMBUSTION ENGINE WHICH COMPRISES, IN COMBINATION, A CYLINDER, A PISTON SLIDABLY SUPPORTED IN SAID CYLINDER FOR RECIPROCATING MOVEMENT THEREIN, A CYLINDER HEAD DEFINING WITH SAID PISTON, AT THE END OF EVERY INWARD STROKE THEREOF IN SAID CYLINDER, A MAIN COMBUSTION CHAMBER, MEANS DEFINING AN AUXILIARY COMBUSTION CHAMBER FIXED WITH RESPECT TO SAID CYLINDER, MEANS FOR INJECTING FUEL INTO SAID AUXILIARY COMBUSTION CHAMBER, MEANS FIXED WITH RESPECT TO SAID AUXILIARY COMBUSTION CHAMBER FORMING A PRECHAMBER IN PERMANENT COMMUNICATION WITH SAID AUXILIARY COMBUSTION CHAMBER, MEANS FIXED WITH RESPECT TO SAID PRECHAMBER AND SAID CYLINDER FORMING A PERMANENTLY OPEN TRANSFER PASSAGE BETWEEN SAID PRECHAMBER AND SAID MAIN COMBUSTION CHAMBER, A PLUNGER SUPPORTED IN SAID PRECHAMBER FORMING MEANS AND MOVABLE WITH RESPECT THERETO BETWEEN LIMIT POSITIONS, ONE OF SAID POSITIONS BEING A RETRACTED POSITION, THE OTHER BEING A PROJECTING POSITION, SAID PLUNGER IN SAID POSITIONS DEFINING A PATH IN SAID PRECHAMBER FOR THE FLOW OF FUEL THERETHROUGH, SAID PATH HAVING A MINIMUM CROSS SECTIONAL AREA WITH THE PLUNGER IN THE RETRACTED POSITION WHICH IS AT LEAST EQUAL TO THE CROSS SECTIONAL AREA OF THE PASSAGE, SAID PATH HAVING A MINIMUM CROSS SECTIONAL AREA WITH THE PLUNGER IN THE PROJECTING POSITION WHICH IS LESS THAN THE CROSS SECTIONAL AREA OF SAID PASSAGE, AND MEANS OPERATIVE FROM OUTSIDE SAID CYLINDER FOR CONTROLLING THE ACTIVE POSITION OF SAID PLUNGER WITH RESPECT TO SAID PRECHAMBER.