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Automotive industries are using forged crankshafts for higher performance applications due to its high strength. Torsional rigidity plays an important role in the performance of crankshaft. The improved torsional rigidity of a forged crankshaft provides better torsion strength and improves engine performance. Present competitive market demands fast product development with lower cost and light weight design while maintaining fatigue strength and other functional requirements. The study aims: a) evaluation of crankshaft torsion rigidity by analytical method and its Finite Element Analysis (FEA) correlation, b) evaluation of twist angle using virtual testing and its correlation with test bench data c) evaluate most critical geometric parameters of crankshaft (Crankpin diameter, Pin width, Throw, Web thickness and Web width) and their quantitative contribution in torsional rigidity.