bigandy
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| posted on 24/3/07 at 04:46 PM |
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Sanity check - thread engagement on Wheel studs.
Afternoon folks.
I'm just about to lower my car off the build trestles for the first time, and I am suffering from a bout of "doubtingmyself-itis".
Can someone just confirm Mr SVA man is okay with the following:
I have Sierra ally wheels on my car. They are fitted using the correct taper (60° IIRC) wheel nuts that are open. The studs and nuts are M12x1.5mm.
The nut engages approximately 10 turns on the stud, but the stud end is approximately 7mm short of the outside face of the nut. The nuts are 25mm
long in total, meaning there is a thread engagement of at least 15mm (possibly 17mm). My instinct tells me this should be okay, but as above, I am
doubting myself now...
So, is this okay for Mr SVA man? and if it is not, what is the easiest way to change studs on a sierra hub (the press in ones) without dismantling
the suspension and brake calipers etc etc..
Cheers
Andy
Dammit! Too many decisions....
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wilkingj
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| posted on 24/3/07 at 05:57 PM |
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I had a similar issue when I fitted my wheels (team Dynamics)
However, for £16 I fitted longer studs all round.
Better safe than sorry IMHO.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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JoelP
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| posted on 24/3/07 at 06:33 PM |
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10 turns is safe (edit IMHO!) if torqued up to the correct setting, however im not sure if its enough for the law. I think i read you need 1.5 times
the stud diameter engaged, but a spot of research would confirm this either way. 
[Edited on 24/3/07 by JoelP]
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flak monkey
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| posted on 24/3/07 at 06:37 PM |
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1.5x thread diameter is the general rule yes
Sera
http://www.motosera.com
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wicket
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| posted on 24/3/07 at 06:39 PM |
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See here
http://www.needforspeed.co.uk/htmlpages/TechWheels.htm
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Hellfire
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| posted on 24/3/07 at 09:05 PM |
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Have a read of this thread.
They're cheap and easy enough to change and not worth a fail at SVA. Just go for the longest studs and cut the excess off.
Phil
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bigandy
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| posted on 24/3/07 at 09:50 PM |
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Thanks for the links/tips folks.
I had a thought though, the Hubs are Sierra, the wheels are off the same Sierra. I did replace the studs in the hubs, with ones that are exactly the
same length as the originals. The only thing that has changed is the wheel nuts.
I don't recall how many turns the original nuts were engaging on the stud, but it cannot have been more than 9-10...
As for the thread engagement, then I have at least 15mm at the moment, which is 1.25x thread diameter, which should be enough.
I think I'll see what mr SVA man has to say, and when I come to invest in some fancy wheels post SVA time, I'll reassess the studs
then.
Cheers
Andy
Dammit! Too many decisions....
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Chippy
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| posted on 24/3/07 at 10:29 PM |
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When I went for SVA my car was fitted with the sierra wheels, ( from the doner vehicle), wheel nuts went on more or less exactly ten and a half turns.
This was checked at SVA and found to be acceptable, and that was at Southampton, who are very strict on the reg's. HTH Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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