| :It is possible that the 4th order harmonic happens either at or very near to the factory redline. So a car that doesn’t spend any amount of time near the critical RPM won’t see the negative affects from the non-balanced pulley. Most cars that rev that high consistently enough for the 4th order harmonic to be a significant factor will most likely need a rebuild from wear/failure caused by other factors first anyway. If that were true, then why would Nissan's engineers even bother to attach a harmonic damper on the engine? If it only helped on cars that spent a lot of time near redline (ones which will need to be rebuilt first due to wear/failure caused by other factors), then why spend the extra money and include the balancer? I think Nissan's engineers saw things a little bit differently, and saw the need for that harmonic damper.
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