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#16
11-08-2015, 08:13 AM
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I appreciate your advice Mxfrank, I have decided to forfiet in my quest to find a better, and more wallet friendly solution to this. These driveshaft are wildly over priced for what you are getting. But I have to do what I have to do.
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#17
11-08-2015, 07:22 PM
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My coupe has a 3 piece drive shaft with 3 U joints and 2 center bearings. Not sure why they did that-maybe for smoothness?
__________________
 Tony HW111 280SE 3.5 Coupe Manual transmission Past cars: Porsche 914 2.0 '64 Jaguar XKE Roadster '57 Oval Window VW '71 Toyota Hilux Pickup Truck-Dad bought new '73 Toyota Celica GT
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#18
11-08-2015, 10:41 PM
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The multi-piece driveshafts vibrate less than the one piece units. For example in the previous gen Camaro the V6 car had a 2 piece drive shaft, but the V8 had a one piece, as V8s cancel out more vibrations than V6s. Also, as previously stated, if there are 2 UJs in the system the driveshaft will vibrate less if the UJs work at a small angle vs all the shafts being in line.
__________________
Csaba 1972 280SEL 4.5, silver
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#19
11-09-2015, 11:19 AM
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Quote:
3 UJs is just weird - one is bad enough - two cancels out of line eccentric vibrations - three puts it back to "one"... ...and all for a short wheel base too. May be it was cheaper to balance three short shafts instead of two longer ones?
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#20
11-09-2015, 06:45 PM
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Quote:
Not really, many trucks have a 2 piece drive shaft and 3 joints. On a MB, a drive disc acts like a CV joint effectively making it like the truck system I've described. The more common MB with 2 drive discs and 1 u joint works because the u joint is running near straight making drive shaft speed variation near zero.
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