jonbeedle
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| posted on 2/3/05 at 09:10 PM |
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GTS Shock absorbers
Hi Chaps,
I've just received my shiny new shocks from GTS. Just wondering what mounting bolts to use. If anyone has fitted these can you tell me the bolt
size. I have some stainless bolts but I think I will need high tensile ones. I imagine the bolts would need to be a snug fit in the shock mounting. I
could probably go out to the garage and have a measure up but I'm laid up with a nasty virus at the moment  and it's too cold outside!
I'm just about up to the task of bashing the computer keyboard!
Any help always appreciated.
Cheers
Jon 
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Mark Allanson
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| posted on 2/3/05 at 09:13 PM |
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I used 3" x 1/2" UNF equivalent of 8.8 (3 raised bars on the bolt head) and the appropriate nylocks
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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jonbeedle
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| posted on 2/3/05 at 09:53 PM |
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Cheers Mark.
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Hellfire
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| posted on 2/3/05 at 10:17 PM |
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We used M12 with appropriate Nylok's. Available in various tensile strengths indicated by numbers on the bolt head. Typically 8.8 
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Mark Allanson
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| posted on 2/3/05 at 10:31 PM |
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The eye holes are 1/2"!!!
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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blueshift
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| posted on 2/3/05 at 10:55 PM |
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Doz supplies 1/2" machine screws, I think he called them, with a plain section for the crush tube to sit on. apparently this is a good thing.
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Toolbox_USA
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| posted on 3/3/05 at 07:26 AM |
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M12 x 7cm, with stainless or zinc washers and Nylocs.
Don't forget copper assembly grease to prevent sieze later...
Stainless will cost double the price of the 12.9 black ones, even by the box. They would be nice looking though!
Jeff
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NS Dev
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| posted on 3/3/05 at 10:04 AM |
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I haven't got these shocks, but the holes are usually 1/2" in these things, Mark Allanson would seem to concur this. 12mm if used in
1/2" holes are very likely to come loose due to movement under load.
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flak monkey
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| posted on 3/3/05 at 11:23 AM |
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The suspension brackets Darren makes have 1/2" holes through them.
http://www.gtscougar.freeserve.co.uk/ubracket2.pdf
The polybush crush tubes have 1/2" holes through them
http://www.cougarracing.fsnet.co.uk/polybush.pdf
So i would think logically that the shocks have 1/2" mounting holes.
0.7mm difference isnt huge, but it will put extra shock loadings on the mounts as the slack is taken up. Would recommend emailing Darren and asking
him..but i guess his answer will be 1/2" bolts are the right ones to use!
David
Sera
http://www.motosera.com
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flak monkey
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| posted on 3/3/05 at 11:25 AM |
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quote:
Originally posted by Toolbox_USA
M12 x 7cm, with stainless or zinc washers and Nylocs.
Don't forget copper assembly grease to prevent sieze later...
Stainless will cost double the price of the 12.9 black ones, even by the box. They would be nice looking though!
I dont think stainless is recommended for suspension bolts as they dont have a very high tensile strength (much worse than 8.8 steel). You can get
special high tensile stainless bolts but i still dont think they match the 8.8 standard. They also cost a fortune...
Sera
http://www.motosera.com
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James
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| posted on 3/3/05 at 02:28 PM |
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quote:
Originally posted by Toolbox_USA
<snip>
Don't forget copper assembly grease to prevent sieze later...
Stainless will cost double the price of the 12.9 black ones, even by the box. They would be nice looking though!
Will look lovely- up until your wheel falls off cos the stainless has sheared!
Make sure you use 8.8 or the 12.9 socket caps.
Also, be careful about putting too much copper grease etc. on- apply it after it's all tightened up. Otherwise your just encouraging the nut to
come undone- even with nyloc.
Hope that helps,
James
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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clbarclay
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| posted on 3/3/05 at 07:10 PM |
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quote:
Originally posted by flak monkey
The suspension brackets Darren makes have 1/2" holes through them.
http://www.gtscougar.freeserve.co.uk/ubracket2.pdf
The polybush crush tubes have 1/2" holes through them
Thats interesting I've just been making brakets for GTS polybushes, tried a 1/2inch drill bit down the middle of crush tube and it didn't
fit. ??
I found a drill bit that did fit in the end, not sure what size it is, my vernier calipers measure in mm and thou but not fractions of an inch. I
suspect its some odd imperial bit like a 29/64 or 15/32.
Either way the bit was smaller than 1/2inch and was a perfect fit down the crush tube, probably not the exact same as the bush tube is ment to be as
it was a bit to much on the tight side.
[Edited on 3/3/05 by clbarclay]
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craig1410
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| posted on 3/3/05 at 09:29 PM |
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Having bought both suspension brackets AND shock absorbers from GTS I can confirm that they are both 1/2". I used 1/2" UNF "S"
grade bolts from Namrick with washers and nyloc nuts to secure. These bolts were not expensive and well worth it for peace of mind.
I would agree that it would not be wise to use M12 bolts in a 12.7mm(1/2" ) hole and remember that you will get twice as much movement (ie
1.4mm) as the shock absorber bush will move 0.7mm and the bracket will move 0.7mm, both in relation to the bolt.
Hope this helps,
Craig.
[Edited on 3/3/2005 by craig1410]
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