Chevy Small Block SFI Damper

The High Performance Harmonic Balancers are designed for racing purposes and are composed of steel.

The hub and ring are splined, unlike most OEM dampers, to stop radial movement of the outer ring.

Harmonic Dampers, also known as a crankshaft pulley, harmonic balancer, crankshaft damper, torsional damper or vibration damper, is a potentially confusing and often misunderstood part but is a critical component to your engine’s longevity and performance. It is not fitted to balance the engines rotating mass, but to control, or ‘dampen’, the engine harmonics created by torsional vibration.

Torsion is the twisting on an object due to an applied torque. At first glance, a stationary steel crank may appear rigid, however when sufficient force is created, for example, each time the crankshaft rotates and a cylinder fires, the crank bends, flexes and twists. Now consider, a piston comes to a dead stop twice per revolution, at the top and bottom of the cylinder, imagine how much force and impact that represents in an engine. These torsional vibrations, create resonance.

The High Performance Harmonic Balancers have a bonding procedure that uses a powerful adhesive and an upgraded elastomer to forge a considerably stronger bond between the elastomer and the inner diameter of the inertia ring and the outer diameter of the hub. They also have distinct time indications on a black-painted surface. Any frequency and RPM of the rotating assembly's torsion vibration is absorbed by the steel inertia ring, which rotates in harmony with the engine. It increases the crankshaft's lifespan, enabling the engine to produce greater torque and power.