Torsional vibration is a special form of vibrations that usually describes torsional deformation motion of rotating shafts that transmit torque to other components. The crankshaft of an Internal Combustion (IC) engine is connected to the engine cylinder piston via the connecting-rods. Connecting rods are highly dynamically loaded components used for thrust transmission in combustion engines. This paper investigates the effect of torsional vibration of the IC Engine connecting rod. Simulations were carried out using Autodesk inventor using the Raleigh model.