T66
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| posted on 20/11/11 at 07:07 PM |
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Sierra Column - Collapsible Bit
Theres 3 bits of collapsible section in the Sierra column- the top waffle bit, the spring loaded bit before the waffle bit, and the bottom triangular
section in the 2 crimps.
How unhappy is the IVA man going to be with me welding up the lower triangular bit solid to my shaft.....
It still leaves the bottom UJ to snap, then the spring loaded & waffle bit - Is this enough , verdicts please ?
 
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jossey
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| posted on 20/11/11 at 07:38 PM |
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I would guess a spear like piece of metal the length of a sword
Just in the line of your body won't make the I've man happy.
Thanks
David Johnson
Building my tiger avon slowly but surely.
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T66
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| posted on 20/11/11 at 08:18 PM |
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Do you speak from experience ? I hear what your saying.....
There is plenty bits of metal ahead of a kit car driver to smash the body to bits.
The column will still have the means to collapse in more than one place.
Any folk able to comment directly on sierra column shortening and a related iva pass please ?
Thanks for the reply
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Stott
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| posted on 20/11/11 at 08:34 PM |
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As your car is a tin top it's probably got the rack low and close to the driver compared to a 7 which is good news for you.
In my RH the line between the steering boss and the pinion is pretty straight so I need the column behind the wheel to collapse in case I hit it, and
the actual shaft to compress to a degree in case I hit something.
If you manage to get the shaft running on such an angle (45ish for eg) between the rack and the column then if you hit something the force
doesn't transmit in a linear way to the column. This is an IVA acceptable form of collapsability (sp) as IVA passed on my other car in June last
year.
HTMS (hope this makes sense) 
Stott
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T66
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| posted on 20/11/11 at 09:00 PM |
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quote:
Originally posted by Stott
As your car is a tin top it's probably got the rack low and close to the driver compared to a 7 which is good news for you.
In my RH the line between the steering boss and the pinion is pretty straight so I need the column behind the wheel to collapse in case I hit it, and
the actual shaft to compress to a degree in case I hit something.
If you manage to get the shaft running on such an angle (45ish for eg) between the rack and the column then if you hit something the force
doesn't transmit in a linear way to the column. This is an IVA acceptable form of collapsability (sp) as IVA passed on my other car in June last
year.
HTMS (hope this makes sense)
Stott
Thanks Stott,
The intermediate shaft joints are due to lack of space going to be in a fairly tight angle, so it may possibly be viewed as a weak point.
Ive added a picture, I will also be adding some more steel ahead of the box supporting the rack, the splitter needs held up so it can do that,
thinking plenty lighter steel ahead of the chassis, that will deform in an impact.
My thoughts were to weld up the triangular section, with puddle welds through the outer tube, which had two crimps on it, I can still use the bottom
one as Ive kept it.
More garage time required so I can have another think - Before I commit anything to being welded up ....
A front end impact in the car is a bit of a worry if Im honest, so I want it as best as I can get it.
Thanks
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