Abstract: A tangential driven rotary engine (10) comprising an engine block (12) having a plurality of cylinder combustion chambers (14) radially positioned therein. A plurality of pistons (16) are each movable and disposed within each cylinder combustion chamber (14) in the engine block (12). A plurality of spark plugs (18) are each radially positioned on the engine block (12) to extend into one cylinder combustion chamber (14). A plurality of intake valves (20) are each radially positioned on the engine block (12) to extend into one cylinder combustion chamber (14). A plurality of exhaust valves (22) are each radially positioned on the engine block (12) to extend into one cylinder combustion chamber (14). A main motor shaft (24) extends centrally through the engine block (12) with the cylinder combustion chambers (14) and the pistons (16) radially positioned thereabout. A facility (26) is for changing the reciprocating motion of the pistons (16) into a rotary motion for the main motor shaft (24).