STILLEN lightweight crank pulley

Originally Posted by Phimosis

No offense intended, but this sounds like you guys made up this logic to sell your product.

The post starts by saying it IS a harmonic damper. But... Goes on to say that the rubber is put in this 6" cast inch pulley to protect the engine from vibration caused by the pulley. If that were REALLY the case, every pulley on the engine would need a similar damper. Small vibrations going in to finely balanced power steering pump would be way more damaging than small vibrations going into a 300 pound engine that has explosions going on inside that apply thousands of pounds of asymmetric load on the crankshaft. The bottom line is that the stock pulley is a harmonic damper and the Stillen unit is not. The vq37 is known for it's poor vibration/harshness qualities at high rpm and the stock damper is there to damp the vibration and harmonic frequencies. It may be true that the engine will survive to it's normal life expectancy without damping those harmonic frequencies, but the engine will be subjectively harsher.