Lightweight pulleys: reliability & smoothness

[remcafee]

remember that it has nothing to do with balancing, it has to do with harmonics, it does not have any harmonic dapening compared to the stock pulley which has rubber molded into it to dampen harmonics created from inertia, harmonic dampening is important to reduce wear on crankshaft main bearings, as without harmonic dapening the harmonics dont get cancelled out and transfer all through the crankshaft

[MyBlueYar]

Originally Posted by remcafee

remember that it has nothing to do with balancing, it has to do with harmonics, it does not have any harmonic dapening compared to the stock pulley which has rubber molded into it to dampen harmonics created from inertia, harmonic dampening is important to reduce wear on crankshaft main bearings, as without harmonic dapening the harmonics dont get cancelled out and transfer all through the crankshaft

REM - I do realize what you say about harmonic dampening, and have read several posts on here that essentially agree with you. My loose paraphrase of NST's website that takes the opposite position was simply that, positing that according to them, engine balancing is apparently not a problem in terms of long term engine/bearing reliability.

I don't have an official position myself yet, as there are two sides that take completely opposite views, some even coming from the camp of automotive engineers.

But I wanted to do my due diligence before jumping at the first chance of putting an underweight pulley(s) on my newly purchased Yaris. For that, thank you very much for your input and giving me additional food for thought.