Two-stroke internal-combustion engine

Claim 1

IN A TWO-STROKE INTERNAL-COMBUSTION ENGINE HAVING AN ENGINE BLOCK WITH A PAIR OF WORKING CYLINDERS EACH COAXIALLY ALIGNED WITH A RESPECTIVE PUMPING CYLINDER, A RESPECTIVE STEPPED PISTON RECIPROCABLE IN EACH OF SAID WORKING CYLINDERS AND THE ASSOCIATED PUMPING CYLINDER WHEREBY SAID PISTONS EACH FORCE SCAVENGING AIR FROM THE RESPECTIVE PUMPING CYLINDER INTO THE WORKING CYLINDER OF THE OTHER PISTON, AND CRANSHAFT MEANS CONNECTING SAID PISTON FOR SYNCHRONIZED MOVEMENT, THE IMPROVEMENT WHEREIN: SAID ENGINE BLOCK COMPRISES A PAIR OF SUBSTANTIALLY IDENTICAL BLOCK PORTIONS EACH PROVIDED WITH A RESPECTIVE ONE OF SAID WORKING CYLINDERS, AN EXHAUST PORT, AND INTAKE AND SCAVENGING PORTS OPPOSITE SAID EXHAUST PORT, THE INTAKE PORT AND SCAVENGING PORT OF ONE OF SAID BLOCK PORTIONS OPENING DIRECTLY TOWARD AND RESPECTIVELY JUXTAPOSED WITH THE SCAVENGING PORT AND INTAKE PORT OF THE OTHER BLOCK PORTION, AND SPACER MEANS INTERPOSED BETWEEN SAID BLOCK PORTIONS FOR SEALINGLY AND SPACEDLY INTERCONNECTING SAME AT SAID SCAVENGING AND INTAKE PORTS WHILE FORMING RESPECTIVE PASSAGES COMMUNICATING BETWEEN EACH SCAVENGING PORT AND THE INTAKE PORT O F THE OTHER BLOCK PORTION.