Dual engine-compressor system

A dual engine-compressor system, comprising:

• a crankcase enclosing a crankshaft;
• a first engine cylinder housing disposed on a first side of the crankcase and defining a first engine bore;
• a first combustion piston reciprocatingly disposed in the first engine bore and defining alternating combustion chambers within the first engine bore on opposite sides of the first combustion piston;
• a first compressor cylinder housing disposed on an opposite second side of the crankcase and defining a first compressor bore;
• a first compressor piston reciprocatingly disposed in the first compressor bore and defining alternating compressor chambers within the first compressor bore on opposite sides of the first compressor piston;
• a first combustion rod connecting the first combustion piston to a first scotch yoke on the crankshaft and a first compressor rod connecting the first compressor piston to the first scotch yoke, wherein the first combustion rod and the first compressor rod are oriented in a generally linear relationship;
• wherein the alternating compressor chambers in the first compressor bore comprise a low-pressure chamber and a high-pressure chamber, said low pressure chamber having a first diameter and said high-pressure chamber having a second diameter smaller than the first diameter;
• and
• wherein the first compressor piston has a cylindrical body and a cylindrical cap, the cylindrical body having a diameter equal to the second diameter of the high-pressure chamber and the cylindrical cap having a diameter equal to the first diameter of the low-pressure chamber.