Vehicle & Technical > Defender
which prop for lifted defender 2.4 tdci
clbarclay:
Due to the nature of the radius arm suspension on the front of a defender the working angle of the joint at the diff end of the front propshaft changes very little whilst the suspension moves up and down, where as the joint at the transphere box end of the proshaft changes a lot more for the same movement. Using a double cardon* joint cancels out the vibration from the changes at the transphere box end.
As you point out there is the potential for the joint at the diff end to cause vibrations as ther isn't another joint to canle out the speed variation. The reality though is that on a standard setup the working angle of this joint is relativerly small (particually after caster correction by rotating the whole axle) so the vibrations cause by this joint typically go unnoticed amoungst all the other background vibrations.
*or whatever you want to call it, micky mouse if you fancy :lol: its just a name, before getting into the 4x4 comunity I hadn't heard of cardon before, they were all refered to as UJs or Hooke joints. The beauty and complication of language.
Eeyore:
--- Quote from: clbarclay on September 07, 2008, 01:42:49 ---
*or whatever you want to call it, micky mouse if you fancy :lol: its just a name, before getting into the 4x4 comunity I hadn't heard of cardon before, they were all refered to as UJs or Hooke joints. The beauty and complication of language.
--- End quote ---
I like the explanation :cool:
And yeah, I know what you mean about the language thing. The key is to remember the difference between hookes/uj/ cardan and a double-cardan.
thermidorthelobster:
So what do you call a prop shaft with a double-cardan at each end? :D
Eeyore:
--- Quote from: thermidorthelobster on September 07, 2008, 14:53:01 ---So what do you call a prop shaft with a double-cardan at each end? :D
--- End quote ---
Expensive! :lol:
muddyweb:
--- Quote from: SteveG on September 06, 2008, 17:43:49 ---The only reason for not fitting the Disco II cardan prop is that it's a sealed unit with no grease nipples. If you start to use it often off-road it lasts about a year. Hence it's a false economy going for the cheaper Disco II one.
Cheers
Steve
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Not the only reason... pretty sure it'd be the wrong length for an 07 Defender ;-)
There's a pro / con argument when it comes to sealed-for-life joints. They are usually stronger than the greasable UJs... they have bigger bearing journals, thrust pads and no grease-way inside to weaken the spider. Greasable UJs are an advantage... provided they are greased... A greasable UJ which doesn't get serviced regularly will often fail earlier than a sealed unit. Sadly, many people don't seem to know what a grease gun looks like !
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