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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 11-20-2007, 08:37 PM   #1
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Possibly. Anyone can build a driveshaft and balance it on a lathe, but who knows if during shipping it got a ding or knick in it, or if your car just has a shitass drivetrain alignment and nothing balances right. My Enjuku shaft was balanced, but it was still off a bit when I had it rechecked. A quality shop locally welded a weight to it, ground it the welds flat, then rechecked it, it was then dead on. A few grams is all it takes for noise.
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Old 11-20-2007, 09:31 PM   #2
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Originally Posted by R240NA View Post
Possibly. Anyone can build a driveshaft and balance it on a lathe, but who knows if during shipping it got a ding or knick in it, or if your car just has a shitass drivetrain alignment and nothing balances right. My Enjuku shaft was balanced, but it was still off a bit when I had it rechecked. A quality shop locally welded a weight to it, ground it the welds flat, then rechecked it, it was then dead on. A few grams is all it takes for noise.

wouldnt the same apply for bad roads???
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Old 11-21-2007, 09:22 AM   #3
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wouldnt the same apply for bad roads???
How? The driveshaft spins on a flat plane. Going over a bump doesn't change the plane it's spinning on since the whole car moves, or at least the drivetrain does. The subframe moving (or the diff) within it's mounts could cause a cross load on the shaft, but not enough to unbalance it.

Think of like a washing machine. The barrel spins freely when unloaded. When loaded, all the clothes dissipate evenly and keep the barrel spinning on an even path. If something becomes lodged though and shifts all the clothes to one side, the barrel begins to rotate off axis, thus making noise. even if you put the washing machine on an uneven surface, the barrel finds a way to center itself when loaded.
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Old 11-21-2007, 09:46 AM   #4
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How? The driveshaft spins on a flat plane. Going over a bump doesn't change the plane it's spinning on since the whole car moves, or at least the drivetrain does. The subframe moving (or the diff) within it's mounts could cause a cross load on the shaft, but not enough to unbalance it.

Think of like a washing machine. The barrel spins freely when unloaded. When loaded, all the clothes dissipate evenly and keep the barrel spinning on an even path. If something becomes lodged though and shifts all the clothes to one side, the barrel begins to rotate off axis, thus making noise. even if you put the washing machine on an uneven surface, the barrel finds a way to center itself when loaded.
wow i like the washer explanation thank you
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Old 11-21-2007, 10:04 AM   #5
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lol!! the washing machine in my apartment has this sensor that will stop the washing machine when it detects it's off balance to a certain degree. it usually happens if you do a very light load, which just tends to stick to one side of the machine during the spin cycle.
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