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+--- Thread: Interest in a carbon fiber drive shaft from DSS? (/showthread.php?tid=5331)
Interest in a carbon fiber drive shaft from DSS? - 300SD_KY - 02-11-2014
the Drive Shaft Shop and I were asking "what if".
For my '79 300SD Turbo Diesel, a carbon fiber drive shaft would cost approximately $1,500.
If there was a group buy ...
RE: Interest in a carbon fiber drive shaft from DSS? - Duncansport - 02-11-2014
(02-11-2014, 09:21 AM)300SD_KY the Drive Shaft Shop and I were asking "what if".
For my '79 300SD Turbo Diesel, a carbon fiber drive shaft would cost approximately $1,500.
If there was a group buy ...
Queue crickets
RE: Interest in a carbon fiber drive shaft from DSS? - lgreeley83 - 02-11-2014
As a comparison what is a good cost for custom aluminum? Is aluminum generally a go to? I don't even know. I do know my shaft having been modified for the 4speed swap in my w123 (prior owner did it) It's not balanced perfectly. So im in the market to send mine out sooner or later.
RE: Interest in a carbon fiber drive shaft from DSS? - Simpler=Better - 02-11-2014
The alum one on my truck is ~4" in diameter. The Jeep's steel DS is only ~2"
A small diameter rotating shaft isn't throwing a huge amount of inertia around-your axles are solid steel and I don't see anyone going to hollow alloys for them.
Plus, people here seem to prefer heavier drivetrain components
Would a bigger alum DS fit under a w123? Rangers and Mustangs have them in the yards cheap
RE: Interest in a carbon fiber drive shaft from DSS? - MFSuper90 - 02-11-2014
I've read where driveshaft manufactures won't build a super long drive shaft our of steel because they don't keep balance like aluminum or something like that. Idk, just thought it was sorta relevant.
But is it really worth it for $1500?
RE: Interest in a carbon fiber drive shaft from DSS? - Simpler=Better - 02-11-2014
Steel rusts-the heep's has been wire wheeled& painted to slow down the crumbling. My Ferd's is bare alum and has no corrosion.
RE: Interest in a carbon fiber drive shaft from DSS? - lgreeley83 - 02-11-2014
So whats a custom aluminum go for? I think that's my most likely route.
(02-11-2014, 02:33 PM)Simpler=Better Steel rusts-the heep's has been wire wheeled& painted to slow down the crumbling. My Ferd's is bare alum and has no corrosion.
And of course I'm sick of rust
RE: Interest in a carbon fiber drive shaft from DSS? - Greazzer - 02-11-2014
I got a mod'd DS with grease fittings and new center bearing, cost was $505 shipped.
What will the weight savings be with the CF DS ???
RE: Interest in a carbon fiber drive shaft from DSS? - mxfrank - 02-12-2014
(02-11-2014, 01:19 PM)MFSuper90 I've read where driveshaft manufactures won't build a super long drive shaft our of steel because they don't keep balance like aluminum or something like that. Idk, just thought it was sorta relevant.
But is it really worth it for $1500?
It's not a question of balance. The length, diameter, and material of a shaft will determine it's fundamental resonance...if it turns at a specific RPM, energy builds in the shaft and it vibrates itself to death. Driveshafts are designed so that the maximum operating speed is below the fundamental. The longer the shaft, the lower the fundamental. And that's probably why the stock driveshaft is jointed. Here's a pretty good design study of CF driveshafts:
http://www.engineer.tamuk.edu/departments/ieen/faculty/DrLPeel/Courses/MEEN4264/Student%20Projects/driveshaft_senior_design_report.pdf
RE: Interest in a carbon fiber drive shaft from DSS? - Metzone - 02-12-2014
I build drag race cars for a living. We use PST for carbon driveshafts. They can be bought with a lifetime warranty. We have tried several different companies. They are the lightest, most durable, best warranty, best price.
RE: Interest in a carbon fiber drive shaft from DSS? - MFSuper90 - 02-12-2014
(02-12-2014, 07:52 AM)mxfrank(02-11-2014, 01:19 PM)MFSuper90 I've read where driveshaft manufactures won't build a super long drive shaft our of steel because they don't keep balance like aluminum or something like that. Idk, just thought it was sorta relevant.
But is it really worth it for $1500?
It's not a question of balance. The length, diameter, and material of a shaft will determine it's fundamental resonance...if it turns at a specific RPM, energy builds in the shaft and it vibrates itself to death. Driveshafts are designed so that the maximum operating speed is below the fundamental. The longer the shaft, the lower the fundamental. And that's probably why the stock driveshaft is jointed. Here's a pretty good design study of CF driveshafts:
http://www.engineer.tamuk.edu/departments/ieen/faculty/DrLPeel/Courses/MEEN4264/Student%20Projects/driveshaft_senior_design_report.pdf
Very interesting read, I thought it would make a good bit of difference, but it ends up that it didn't! Guess the real bonus would be losing the weight, maybe a little better mileage?
RE: Interest in a carbon fiber drive shaft from DSS? - 300SD_KY - 02-12-2014
my main interest is the weight saving, relative bullet-proof nature of CF and that the manufacturer is highly respected.
i used to own a 2006 Subaru STi and one of the most recommended upgrades was a CF drive-shaft ...
lose weight, gain a little mpg
if i won the lottery, after paying the mortgage and setting up college funds for the kids ... ;-)