350z DE ATI Super Damper Street Crank Pulley with Belts

Each time the air/fuel mixture inside a cylinder is ignited, the combustion that occurs creates a torque spike that is applied to the crankshaft through the piston and rod. This torque spike is so severe that it not only turns the crankshaft, it actually twists the crankshaft ahead of its normal rotation and then the crankshaft rebounds.

This twisting action is known as torsional vibration. When these torque spikes and forces get into phase with the natural frequency, critical torsional harmonic vibrations occur and can be seriously destructive to the bearings and the crankshaft. Dampers are designed to control those destructive vibrations.

This pulley is larger in diameter than stock and requires new belts.

Features:

* Eliminates torsional crankshaft vibrations

* Exceeds SFI 18.1 specs

* Laser engraved 360 degree timing marks

* Black zinc chromate finished

* 6.780" Outside Diameter

* Provisions for factory accessories including AC, Alternator and Power Steering.

Belts included:
• 4PK855 - Bando Belt - A/C ATI Pulley
• 6PK1220 - Bando Belt - Alternator, Power Steering, Water Pump Idler ATI Pulley