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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


 
 
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Old 07-27-2002, 09:22 PM   #1
veil_side_
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Okay I'm hearing many different things about Underdrive pulleys.  From my understanding there are some harmonics that are harmful to the engine, esp. the crankshaft, that are created when using some underdrive pulleys.  The stock pulleys bring a harmonic balancer that dampen them but many of the aftermarket pulleys don't bring this.  My question is which ones have them.  I hear this mod is worth it but I don't want to kill my engine.  Is the damage that bad?
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