Quadruple acting scotch yoke engine

A quadruple acting scotch yolk engine comprising:

• a crankshaft, said crankshaft disposed in communication with a yolk journal;
• two double-acting pistons, a yolk, and a connecting rod connected together forming an assembly, said two-double acting pistons screwed to said connecting rod;
• a cylinder, said cylinder housing said piston;
• wherein said two double-acting pistons are connected to said connecting rod via a wrist pin;
• an inner combustion chamber, said inner combustion chamber disposed in communication with said cylinder, adjacent to each piston of said two double-acting pistons;
• an outer combustion chamber, said outer combustion chamber disposed in communication with said cylinder, opposite of said inner combustion chamber, adjacent to each piston of said two double-acting pistons;
• threaded holes, said threaded holes disposed in communication with said outer combustion chamber of said cylinder;
• wherein said two double-acting pistons are double sided, facilitating compression on both an upstroke and a downstroke of each of said two double-acting pistons;
• and
• graphite coated bushings, said graphite coated bushings disposed in communication with each of said two double-acting pistons, lubricating said two double-acting pistons.