Quote:
Originally Posted by Orbit
Why would you highly recommend against a lightened crank pully? I would say just the opposite. i have had a perrin light weight crank pully on my car for almost 6 years and i would never go back. it is a good mod for not alot of money. it allows you to shift gears much smoother and add a tiny bit of hp.
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well this has been a long debate, and i'm still not convinced its safe.
To quote some previous people on this debate basically,"regardless of the engine configuration (inline, boxer), the crank of a four-stroke motor is going to have torsional vibration. I really don't understand why anyone would think that the boxer motor is magically exempt from torsional vibration. The WRX/STI stock pulley (two metal pieces with rubber squished in between) is a harmonic damper not to be confused with harmonic balance as even SOA techs have said that the stock cranks do not act as balancers. It is used to damp the torsional vibrations. Since our crank is so short (a flat 4 has the shortest crank of any car engine configuration) the torsional vibrations are greatly minimized compared to any other type of engine. But replacing the stock pulley might harm your engine ( especially if you're way above stock turbo power levels) in the long run because it eliminates this damper." Both lighter crank and lighter flywheel I think will end up causing more issues than what is worth, I'm not expert I could be wrong, but I'm an everyday driver, I like to play it safe and besides there are much safer ways to make an extra 5 whp. Just my two cents, again I'm not claiming to be an expert this is just what I've come across during my research since 2002 for my car....