Bob C
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 posted on 11/10/04 at 02:25 PM |
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titanium drive shafts
Just got back from classicconversions (buying a quaife atb - ouch £500). Anyway the very nice man there showed me some titanium driveshafts he can
make for £150 a throw (or a pair - but I think it was each).
Oh dear me they were SO cool. He's jigged up for ford fit so I don't think he can make mx5 ones for me :^(
so shiny SO LIGHT
Bob c
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stephen_gusterson
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| posted on 11/10/04 at 03:51 PM |
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this is a list of densities compared to water.
Titanium shafts look a little over 1/2 the weight of steel shafts........ unless the (extra strenght?) titanium is hollow rather than solid as per the
ford parts
Aluminum 2.702
Brass 8.4-8.7
Bronze 7.4-8.9
Cobalt 8.9
Copper 8.93
Gold, pure 19.32
Gold, alloys 15.3-19.3
Iron, pure 7.86
Iron, wrought 7.4-7.9
Iron, cast (gray) 7.03-7.13
Lead 11.34
Magnesium 1.738
Mercury 13.546
Nickel 8.9
Platinum 21.45
Plutonium 19.8
Silver, pure 10.5
Silver, alloys 10-Dec
Steel 7.7-7.93
Tin 7.3
Titanium 4.5
Tungsten 19.3
Uranium 18.9
Zinc 7.14
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Mark Allanson
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| posted on 11/10/04 at 08:35 PM |
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They would sound great in an Exchange and Mart advert when selling the car, but I cannot see any other benefit other than pub chat
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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stephen_gusterson
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| posted on 11/10/04 at 09:14 PM |
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you could spray the originals silver and lie and save a lot of money!
or
buy the real deal and save about 213.591245753 grammes per side 
atb
steve
[Edited on 11/10/04 by stephen_gusterson]
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Bob C
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| posted on 11/10/04 at 11:16 PM |
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Maybe 1/2kg of unsprung weight - which is not easy to come by, equivalent to using an expensive alloy bodied damper instead of a steel one. Also only
£50 or £60 more than custom steel driveshafts.
I agree it's not very locost.....
Bob C
PS you can only count half the weight as unsprung of course
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gazza285
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| posted on 12/10/04 at 05:08 AM |
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Not forgetting the reduction in rotating mass.
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atomic
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| posted on 12/10/04 at 08:05 AM |
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I've seen a few companies producing Carbon Fiber Drivesahfts.
Then main benafits to these types of driveshafts are reduced rotating mass resulting in lower transmition loss and reduced drive train harmonics
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MikeRJ
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| posted on 12/10/04 at 01:07 PM |
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quote:
Originally posted by atomic
I've seen a few companies producing Carbon Fiber Drivesahfts.
Then main benafits to these types of driveshafts are reduced rotating mass resulting in lower transmition loss and reduced drive train harmonics
I could certainly see how the inherent damping properties of composite materials such as carbon fibre could reduce drivetrain harmonics, but I
don't understand how they would reduce transmission loss.
The reduction in rotating mass in the case of a driveshaft would have miniscule effects on performance as the small diameter means the polar moment of
inertia is very low to start with (compared to e.g. the wheels and clutch/flywheel).
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Jon Ison
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| posted on 12/10/04 at 04:35 PM |
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given the choice i would have titanium drive shafts, springs too, aint got the £££.
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atomic
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| posted on 13/10/04 at 07:59 AM |
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Carbon driveshaft would reduce trans loss buy the simple fact require less power to rotate. The driveshafts maybe only a small part of the whole
package but when you add all these parts together... you get the picture.
Have a look at http://www.torqline.com/products.php
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MikeRJ
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| posted on 13/10/04 at 09:02 AM |
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quote:
Originally posted by atomic
Carbon driveshaft would reduce trans loss buy the simple fact require less power to rotate.
Driveshafts themselves require NO power to rotate. They do of course require energy input to increase angular velocity due to their polar moment of
interia, but as said, it's negligible compared to the road wheels and tyres, brake disks/drums, differential internals etc.
In fact, I can't think of any part of the drivetrain that would cause less effect by lightening than the driveshafts. The only real advantage
is the unsprung weight reduction.
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atomic
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| posted on 13/10/04 at 01:23 PM |
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Just got a price for one of the Carbon propshafts for my S2000 Engine/Box to 7.5" Cosworth Diff £1200....Ouch
Think I'm going to pass that one up.
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