Patent ID: 7559298

Claim:
An internal combustion engine, comprising: a body defining first and second cylinders in communication with one another; first and second pistons in the first and second cylinders respectively, surfaces of the pistons and walls of the cylinders defining an internal volume; at least one port in the body to allow air and fuel into and exhaust gas out of the internal volume; first and second drive shafts, each having a bearing section mounted for rotation on a respective drive shaft axis through the body and each having an offset throw section, the first piston and offset throw section of the first drive shaft being connected and second piston and the offset throw section of the second drive shaft being connected such that reciprocating movement of the first and second pistons increases and decreases a size of the internal volume between minimum and maximum sizes and causes rotation of the offset throw sections of the first and second drive shafts about the drive shaft axes, the minimum size of the internal volume being adjustable between a large size for a large power delivery and a small size for a small power delivery; and at least one valve mounted to the body to respectively open and close the port and respectively allow and restrict flow of at least the air into the internal volume, the valve being operable to allow an increased amount of air into the internal volume during the large power delivery and a decreased amount of air during the small power delivery for one cycle of the pistons.