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  #1  
Old 12th January 2010, 05:42 PM
jiwillia jiwillia is offline
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Question IVA/Sierra front uprights-mushroom fixing

I'm just finishing the preparation of my front uprights. Can anyone comment on the apparent need for a second fixing for the mushroom insert to satisfy IVA requiremts.
Is this a general requirement or just the opinion of certain examiners? I'm aware of previous posts that have touched on this subject under SVA rules which seemed to leave it open ended?
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Old 12th January 2010, 05:53 PM
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dogwood dogwood is offline
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Not sure it's an absolute requirement.
But the examiner defo checked I had the second fixing.
Personally I would put the extra fixing in anyway.
I just tapped it out and put in a grub screw, so you can hardly see it anyway
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Old 12th January 2010, 06:06 PM
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deezee deezee is offline
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I thought the original Sierra suspension strut had a "fin / gusset" on it, that went through the bolt hole. So although the base of the suspension was clamped in the hole, it was also positively held in with the bolt. Obviously on a kit car you also need to fix the upright in place to stop it riding out.
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Old 12th January 2010, 06:07 PM
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It is a requirement, although i think it maybe one of them that is down to the examiner, i had to put one in mine on the day to pass. Just drilled and tapped a 6mm allen bolt through them both. When i thought about it afterwords it is a good safety backup just in case the mushy comes loose.

AndyH
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Old 12th January 2010, 06:08 PM
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Yes it's the mushroom insert that needs fixing
Bum too slow !!!

I got a foto tho
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Last edited by dogwood : 12th January 2010 at 06:15 PM.
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Old 12th January 2010, 06:23 PM
jiwillia jiwillia is offline
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Thanks for your response. I presume that they are concerned that the original clamp bolt can work loose? or that it could fail/fracture? or both?

Surely even if the existing clamp bolt failed the suspension forces would be tend to force the inset down into the upright anyway.

cheers
John
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  #7  
Old 12th January 2010, 06:40 PM
jiwillia jiwillia is offline
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Quote:
Originally Posted by spud69 View Post
It is a requirement, although i think it maybe one of them that is down to the examiner, i had to put one in mine on the day to pass. Just drilled and tapped a 6mm allen bolt through them both. When i thought about it afterwords it is a good safety backup just in case the mushy comes loose.

AndyH
Andy,

This begs the question how the bolt itself is secured, does it have a lock nut or is it just loctited?

cheers
John
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Old 12th January 2010, 07:09 PM
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He was quite happy for a bit of loctite John....
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  #9  
Old 12th January 2010, 07:19 PM
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deezee deezee is offline
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Quote:
Originally Posted by jiwillia View Post
Thanks for your response. I presume that they are concerned that the original clamp bolt can work loose? or that it could fail/fracture? or both?

Surely even if the existing clamp bolt failed the suspension forces would be tend to force the inset down into the upright anyway.

cheers
John
Like I was saying, the original suspension was held in on its gusset. I imagine they want a positive fixing on the kitcar, because the donor had a positive fixing. You can see some after market coilovers have the tabs to be locked on on top of the hubs. I don't think any car has just a clamp to hold something as vital as a hub to the suspension.

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Old 13th January 2010, 11:13 AM
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That's an interesting pic Deezee. I'm wondering about making a set of mushrooms in steel, milling a slot in the side then letting in and Tig welding a piece of plate in. Assemble to upright and drill through. Job done
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