Simon S
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| posted on 21/9/07 at 07:12 PM |
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Its Guess the Wishbone Time!
Hi Folks,
Got hold of a set of wide track wishbones, but my question is what uprights are the upper wishbones suitable for, Cortina or Sierra? Wishbone
dimensions are 250mm from the inboard pivot centre to the tip of the bush tube to hold the upright ball joint, the inboard (chassis end) bush tubes
are 228mm from one outer edge to the other and the ball joint pivot centreline intersects the inboard bush tube centreline to split it 89mm/139mm.
(sketch in my photo archive as wasn't sure how to attach it to the post)
Any ideas? I am having trouble getting confirmation that these are for Cortina uprights rather than Sierra ones.
Cheers!
 
Rescued attachment wishbone.jpg
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ecosse
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| posted on 21/9/07 at 07:32 PM |
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Depends on the size of the bottom bone as to what upright they will fit
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Avoneer
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| posted on 21/9/07 at 08:09 PM |
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It's the top one that matters.
The bottom can be in the same place on Sierra and Cortina, but it's the top one that matters as the offset of the top ball joints are
different.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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ecosse
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| posted on 21/9/07 at 08:12 PM |
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quote:
Originally posted by Avoneer
It's the top one that matters.
The bottom can be in the same place on Sierra and Cortina, but it's the top one that matters as the offset of the top ball joints are
different.
Pat...
That works both ways though doesn't it?
especially if the bones are not standard size, no way to tell without knowing what size the bottom one is  
Cheers
Alex
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Simon S
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| posted on 22/9/07 at 06:53 AM |
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Gents,
I had assumed that the top wishbone would identify its target upright based on its geometry and hence its induced castor angle, which is different
between the Cortina & Sierra.
Looking at the bottom wishbone size it has an inboard bush tube centre to end of balljoint pivot tube distance of 440mm, exactly 100mm greater than
the Cortina based 'book' design.
The top Cortina based 'book' wishbone design dimension for this is 175mm, and the new wishbone in question being 250mm is not an
equivalent 100mm greater in induced track increase.
Does this alone point to the wishbone being for Sierra? If someone can comment on the geometry and induced castor angle I think that would seal
it.
Cheers,
Simon
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ecosse
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| posted on 22/9/07 at 09:23 AM |
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quote:
Originally posted by Simon S
Gents,
I had assumed that the top wishbone would identify its target upright based on its geometry and hence its induced castor angle, which is different
between the Cortina & Sierra.
Looking at the bottom wishbone size it has an inboard bush tube centre to end of balljoint pivot tube distance of 440mm, exactly 100mm greater than
the Cortina based 'book' design.
The top Cortina based 'book' wishbone design dimension for this is 175mm, and the new wishbone in question being 250mm is not an
equivalent 100mm greater in induced track increase.
Does this alone point to the wishbone being for Sierra? If someone can comment on the geometry and induced castor angle I think that would seal
it.
Cheers,
Simon
I'm not 100% on this but I thought that the sierra required a shorter (than book) size bone for the same length bottom bone?
I'm sure there was a thread about the differences, although I'm struggling to find it now 
Cheers
Alex
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Avoneer
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| posted on 22/9/07 at 10:41 AM |
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Using book bones, the top bone needs to be shorter for the Cortina - I think.
Hmmmm.
Pat...
Sorry - everything I think is complete contradiction to ecosse - no offence.
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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ecosse
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| posted on 22/9/07 at 03:12 PM |
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quote:
Originally posted by Avoneer
Sorry - everything I think is complete contradiction to ecosse - no offence.
LOL...no worries Pat
Cheers
Alex
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