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Originally Posted by VtecTypeR
Your engine wont last as long with a crank pulley like that one. The stock ones have a dampener inside them to reduce all the vibration. If you plan on keeping your car for a long time I wouldn't get a crank pulley
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Please don't spread internet hearsay. The stock crank pulley is not a harmonic dampener/balancer. Honda's engines are internally balanced. The stock crank pulley has an elastomer (rubber ring) to reduce Noise Vibration Harshness. So replacing it with a UR crank pulley is fine. However, if you are pushing 3-4 times your stock HP and are revving the car 2-3k over your stock redline you would need an aftermarket harmonic balancer which some companies make. At this amount of HP and at these revs you create different frequencies that even the stock crank pulley doesn't know what to do with. In fact, UR is releasing a harmonic dampener for B and D series engines and other highly modded engines, but they are set up to deal with those higher revs (and thus different frequencies) and the torsional vibrations associated with those circumstances. But for all of us who aren't pushing that kind of hp ( I push almost 2.5 times my stock HP and I run the pulleys myself without a problem; everything in my motor looked good when I pulled it apart) then the UR pulley is a great mod that helps the car rev out quicker. And there are many many people who have been running the crank pulley for over 100k without a single problem.
The reason that some B and D series guys frowned on the UR crank pulleys is b/c some of these guys were pushing 3-4 times the stock HP and were revving the car 2-3k beyond the stock rev limit. The stock crank pulley isn't a harmonic balancer; it just has