David_17
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| posted on 15/5/11 at 05:47 PM |
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Threaded bar to mount diff
If I use M12 threaded bar with a nyloc on each end to mount my diff, will the IVA man not be happy?
The bolts i've got aren't quite long enough to get a nyloc on.
Hope someone can help.
Cheers
Dave
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matt_gsxr
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| posted on 15/5/11 at 05:58 PM |
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My SVA man didn't mind me doing this. I mounted my engine in the same way.
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David_17
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| posted on 15/5/11 at 05:59 PM |
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Great stuff.
Wasn't sure if he'd need to see a tensile strength mark (which it doesn't have).
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matt_gsxr
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| posted on 15/5/11 at 06:19 PM |
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Many 7 style cars don't even use the rear mount on the diff.
The IVA/SVA man/woman could make statements on whether the thing is structurally sound, and fail you on that.
They don't seem to worry about it and nor do I.
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r1_pete
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| posted on 15/5/11 at 06:22 PM |
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Personally I'd get some longer 8.8 bolts, the twisting forces on the diff could be too much for threaded bar, which is not much more than mild
steel.
The engine as above is rubber mounted and couldn't transmit the force needed through the rubber to sheer the bar.
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David_17
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| posted on 15/5/11 at 06:37 PM |
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I tried to get hold of some longer ones, but apparently they're special order.
I see what you mean about the twisting forces though.
The other option is use the bolts ive got with normal nuts and thread lock.
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coozer
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| posted on 15/5/11 at 06:39 PM |
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I used 12.1 threaded bar on mine..
1972 V8 Jago
1980 Z750
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David_17
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| posted on 15/5/11 at 07:23 PM |
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Think i'll use threaded bar and if it gets questioned, have the bolts and thread lock ready and change on the day if neccessary.
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indykid
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| posted on 15/5/11 at 07:42 PM |
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Calculate what forces the studs will see and from that, determine what material properties you require.
I imagine M12 threaded rod will be just fine, even if it is only mild steel
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mrwibble
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| posted on 15/5/11 at 08:46 PM |
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surely its possible to have threaded bar made from varying tensile strengths...
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matt_gsxr
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| posted on 15/5/11 at 09:39 PM |
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quote:
Originally posted by mrwibble
surely its possible to have threaded bar made from varying tensile strengths...
loads, just googled it. Good point.
I'm still not worried about my threaded rod. The mounting bolts for the prop-shaft are M8 (in 12.8) and are much, much closer to the axis of
the prop. M12 has masses more steel than double the steel compared to M8 and the forces at the fixing are much lower.
My original point was that my SVA man didn't object, and I still wouldn't expect your IVA person to.
Now you have thought about it you might as well go with high tensile, at this point there is no real disadvantage.
Just my thoughts though,
Matt
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