Internal combustion engine

An internal combustion engine comprising:

• an engine block defining at least one cylinder chamber;
• a piston supported within the cylinder chamber for reciprocating movement therein between bottom and top positions;
• a crankshaft rotatably supported by the engine block and including an eccentric portion;
• a lever including first and second ends the first end of the lever being connected to the engine block for pivotal movement about a first pivot points;
• a crankshaft connecting rod including a first end connected to the second end of the lever for pivotal movement about a second pivot point, and a second end connected to the eccentric portion of the crankshaft for pivotal movement about a third pivot point;
• and
• a piston connecting rod including a first end connected to the piston for pivotal movement about a fourth pivot point, and a second end connected to an intermediate portion of the lever, between the first and second pivot points, for pivotal movement about a fifth pivot point fixed relative to the lever;
• whereby reciprocating movement of the piston pivots the intermediate portion and the second end of the lever about the first pivot point, and pivotal movement of the second end of the lever rotates the crankshaft;
• and
• whereby the crankshaft rotates more than 180.degree. as the piston moves from the top position to the bottom position and less than 180.degree. as the piston moves from the bottom position to the position, and the piston has a longer dwell and a slower speed during movement from the top position to the bottom position than during movement from the bottom position to the top position.