Patent ID: 7412949

Claim:
An internal combustion engine comprising: a piston having a closed upper end and a closed lower end and traveling linearly through a high temperature seal in a lower cylinder head; an engine block having an upper and a lower cylinder housing; said lower cylinder head forming a lower combustion chamber in the lower cylinder housing; said piston rod connected to a crankshaft via a connecting rod; an upper cylinder head forming an upper combustion chamber in the upper cylinder housing; each of said upper and lower combustion chambers having an intake and an exhaust valve, a camshaft to drive the valves and a fuel source; and wherein a first power stroke is initiated by an explosion of a fuel/air mixture in the upper combustion chamber followed by a second power stroke initiated by an explosion of a fuel/air mixture in the lower combustion chamber; wherein the fuel/air mixture further comprises a gasoline/air mixture, and the engine is a four stroke design with a crankcase housing the crankshaft, and each combustion chamber has a sparkplug; wherein the piston rod has an oil channel which connects to a piston channel which carries crankcase oil to an interior of each of the upper and the lower cylinder housings; wherein the piston has an oil relief area around its center in which the piston channel exits; wherein an oil return line exits from the upper and lower cylinder housings; and wherein the oil return line further comprises an opening in the engine block at a midpoint between the upper and the lower cylinder housings.