Abstract: A torsional vibration damper generally comprising a hub 15, which can be attached to an engine's crankshaft, two inertia members 20a and 20b, which provide the inertia necessary to control crankshaft torsional vibration, and two resilient members 25a and 25b, which allow for proper tuning of the damper's torsional frequencies. The two masses 20a,20b and resilient members 25a,25b allow for tuning two separate vibration frequencies, e.g. one for dampening one torsional peak and the other for dampening a second torsional peak.