Underdrive pulleys, which one - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

veil_side_ · 07-27-2002, 09:22 PM

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?

07-27-2002, 09:22 PM	#1
veil_side_ Leaky Injector Join Date: Apr 2002 Location: Arlington TX Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	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? __________________ VeilSide? i've never bought anything from them and never will!