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if it weren't discussed. :) My "attacks" on Mike are tough sounding, and insulting his "intelligence" may have been a bit much. I dont know Mike, but I am sure he is good at what he does. I'm not an engineer, per se, in this arena of harmonics, but merely a mechanical engineer with knowledge of the subject. I haven't seen enough cases where bearings have failed in VGs equpiied with UD pulleys. The VG is a tough motor and well designed and although I cant affix quantitative values to the amount of extra wear, I can say with certainty that it doesn't help. How much exactly must not be that much because we haven't seen a flood of Z owners with them complaining about replacing engines with bad rod bearings. I'm just giving an opinion on the subject while providing information to the person asking so that they can decide for themselves. When Mike, or anyone, starts a post that directly points my out on a subject, regardless of what it is, I feel compelled to respond in an appropriate manner. Debates are never fun to watch, I hate those stupid TV programs where a few people are sitting around basically all talking at the same time trying desperately to get their point across.. You know the ones.. I usually just change the channel. :) +
: Simple Reply:
: First, there's really no reason to be referring to people's brains, or belittling everyone that disagrees with what you're saying. I've noticed that from some folks recently - Please. There's no reason for that. It seems self-defeating to me, if you're trying to prove your point, and how smart you are, and you have to resort to personal attacks or attacking someone's intelligence to get your point across. If you're right, prove it. Any lack of intelligence on someone else's part is just that much more fertile ground for you to plant seeds - its not there for you to trample and belittle. : On to my point - You posted all of the potential damage, problems, etc associated with the harmonics inside a motor. A few corrections could be made, but in general, agreed - harmonics are a powerful thing in a motor. If you want something to harp about, think about the harmonics of valve springs as they have much more of a 'tuning fork' mechanics to them then nearly any other part in the motor, and the harmonic damage potential from them is probably greater than that of the crank - but they do not. The key here, is that the stock pulley is not a harmonic balancer, either. It's a tortional damper. The reason it's a tortional damper is because on some motor designs, its not possible, or easily feasible, to fit or shape the counterweights inside the motor, and still have it fit into the engine bay they've designed, or have the oil management they way they want, etc, etc. So sometimes the solution is just to balance the motor to their tolerances, and put a tortional damper on as a cushion. Harmonics don't appear to have ever been an issue to nissan engineers. BMW motors are a completely different animal, and far more susceptible to these harmonic disruptions - which is why those particular owners have terrible experience with them. : Back from the first debate timz and I had - in my opinion, the fisher aftermarket damper would do a better job than the stock, or the UD pulley. Harmonics don't appear to ever have been an issue. If you're rebuilding and balancing a motor with UD pulley in place, theres very good chance your balancing to tighter tolerances w/ the UD pulley than the motor was built to stock. : At any rate - You all bring valid points. Most of you bring uninvited attitude and it severely clouds your argument. No one's arguing that the right frequency at the right volume could be destructive. The question is, will this take place inside a VG30DETT equipped with a UD pulley any more than it does with any other pulley? From a harmonics standpoint, I say no. From a tortional vibration standpoint, I say, you can never be too balanced, or cautious. : In the end, I think you'll find a majority of motor death is due to lean mixture, lubrication error, and overheating.
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