AN EXTENSIVE SELECTION OF CON-RODS.
The connecting rod (or con-rod) connects the piston to the crankshaft. Together with the crankshaft they form a simple mechanism that converts linear motion into rotating motion. Connecting rods may also convert rotating motion into linear motion. Historically, before the development of engines, they were first used in this way.
As a connecting rod is rigid, it may transmit either a push or a pull and so the rod may rotate the crank through both halves of a revolution, i.e. piston pushing and piston pulling. In a few two-stroke engines the connecting rod is only required to push