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      05-01-2012, 06:52 AM   #11
doughboy
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Drives: E91 335i Sold.
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Quote:
Originally Posted by xenon View Post
Prop-shaft doughnut.
+1, The half shafts / diff / prop / gearbox output are about the only bits left that are consistently involved in all the scenarios you mention.


Maybe a half shaft issue though, as that is slower than the prop and off centre would more likely cause a fore and aft rocking?

As the diff ratio is about 3.5:1 the prop shaft will be spinning 3.5 times faster than the wheels....


At 20mph, about 8m/s =

wheels / half shafts / hubs / diff input etc about 4 revs per sec

prop / gearbox output about 14 revs per sec
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