ned
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| posted on 14/2/06 at 04:00 PM |
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driveshaft - which end is which?
I have on the bench at home the longer of the two sierra driveshafts. I didn't mark which was the inboard and outboard ends when dismantling.
One end has some marks, like a cross marked on it and the other doesn't. Can anyone tell me which end is which?
Thanks,
Andrew.
beware, I've got yellow skin
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donut
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| posted on 14/2/06 at 04:14 PM |
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I think they are the same so it don't matter...maybe wrong though! (well that's covered myself!!  )
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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NS Dev
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| posted on 14/2/06 at 04:22 PM |
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I know your worry, but I think the std sierra lobro type shafts (assuming that's what you're using Ned) are so over engineered for this
application that they will be fine fitted the wrong way round.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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ned
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| posted on 14/2/06 at 04:29 PM |
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yes they are lobro type, thanks for putting my mind at ease 
beware, I've got yellow skin
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amalyos
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| posted on 14/2/06 at 04:39 PM |
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I had the same problem, but if you check the part number of the Lobro joint on each end, it's the same
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Dusty
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| posted on 14/2/06 at 04:51 PM |
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It's not good practice to fit them so they rotate in the opposite direction to their previous working life. Increased risk of breakage. Any
witness marks on the joints which might match up to flanges?
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iank
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| posted on 14/2/06 at 05:04 PM |
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Isn't it bad practice to rotate used driveshafts the wrong way? I'm sure read they can snap under high torque if installed the wrong way
round as they take a 'set'.
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JoelP
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| posted on 14/2/06 at 05:07 PM |
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the forces are the same way which ever way you if it, and id guess its the force which wears it, not the rotation.
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jon_boy
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| posted on 14/2/06 at 05:36 PM |
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Except it would twist it the other way to what its used to which would prob weeken it, bit like twisting a rope so the threads come apart. Sould be ok
with these though as said.
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speed8
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| posted on 14/2/06 at 05:48 PM |
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Eh... what side does the long one go on, driver or passenger? I don't have my diff yet so just checking.
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donut
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| posted on 14/2/06 at 06:12 PM |
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AHA!! i was right!! YAY!
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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JoelP
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| posted on 14/2/06 at 06:50 PM |
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quote:
Originally posted by jon_boy
Except it would twist it the other way to what its used to which would prob weeken it, bit like twisting a rope so the threads come apart. Sould be ok
with these though as said.
i cant be arsed arguing, but the force would be the same, much in the same way that a nut can go on either way, or a cork screw could go in backwards.
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Liam
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| posted on 14/2/06 at 06:58 PM |
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As JoelP says, swapping a shaft end to end, but keeping it on the same side of the car will not reverse the direction of the torque it is
subject to. Think about it
Liam
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Stu16v
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| posted on 14/2/06 at 07:01 PM |
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quote:
Originally posted by Liam
As JoelP says, swapping a shaft end to end, but keeping it on the same side of the car will not reverse the direction of the torque it is
subject to. Think about it
Liam
Agreed...
Dont just build it.....make it!
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iank
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| posted on 14/2/06 at 07:07 PM |
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quote:
Originally posted by JoelP
quote:
Originally posted by jon_boy
Except it would twist it the other way to what its used to which would prob weeken it, bit like twisting a rope so the threads come apart. Sould be ok
with these though as said.
i cant be arsed arguing, but the force would be the same, much in the same way that a nut can go on either way, or a cork screw could go in backwards.
The effect I read about wasn't anything to do with the force, it's closer to metal fatigue, which is why I mentioned used
driveshafts, new ones aren't the problem.
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Avoneer
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| posted on 14/2/06 at 10:44 PM |
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Let's face it - does anyone know anyone that has ever snapped a Sierra shaft ???
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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ProjectX
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| posted on 14/2/06 at 10:53 PM |
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In answer to which side they go: Longer is O/S (Drivers) and shorter is N/S
BTW no probs in fitting wrong way round. Sierra never (Standard car that is not Cossie) never produced enough power to harm the shafts in normal
operation. Metal torque fatigue genarally only applies to larger dimension shafts where the outside is 'twisted' more than the inside due
to the centripital forces exerted.
Hope it helps.
J
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JoelP
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| posted on 14/2/06 at 10:58 PM |
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quote:
Originally posted by Avoneer
Let's face it - does anyone know anyone that has ever snapped a Sierra shaft ???
Pat...
im sure jon ison did! If not him, then someone else just before a race.
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NS Dev
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| posted on 15/2/06 at 01:27 AM |
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I know of folks that have snapped sierra TRIPOD type shafts on tarmac vehicles, and I know of grasstrackers that have snapped sierra lobro type shafts
(for some reason grassers seem to snap shafts more than tarmac racers!??) but I have never heard of a broken lobro shaft on a light tarmac car (i.e.
under 750kg)
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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MikeRJ
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| posted on 15/2/06 at 01:36 PM |
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quote:
Originally posted by NS Dev(for some reason grassers seem to snap shafts more than tarmac racers!??)
A combination of 12 feet of suspension travel, and the wheels no spending so much time in contact with the ground maybe?
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