JCERacing carries Rods from Eagle, Manley, Carrillo many more In a reciprocating piston engine, the connecting rod or conrod connects the piston to the crank or crankshaft. Together with the crank, they form a simple mechanism that converts reciprocating motion into rotating motion. Buy online 24/7 and enjoy our Free Shipping with no minimum purchase offer. If you don't see what you are looking for Chat with Us Now! We can help.