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This is from fisherconcepts.com in their FAQ section. It describes what a harmonic dampener is for. "A. What is crankshaft torsional vibration? Every time the engine fires it makes the crankshaft twist as well as spin. After every twist the crank rebounds. This twist/rebound cycle is known as torsional vibration. If not dampned, torsional vibration can cause rapid bearing and crank journal wear, leading also to broken crankshafts and other problems." The VG uses a forged crank and it is very strong, BUT, connecting rod bearings take a beating if tortional vibration is not damped. : I know that for each pound off the crank it's somewhere around 2.5 hp. Stock pulley is 14 lbs? UD is 4 lbs or so? So what is that around 25hp?
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