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Discussion summary
YOUR RESEARCHwheel nut torque settings
Leading reported evidence
Use copper slip
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Read evidence and context
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I have always used Copper slip for alloys on all my cars and have never suffered from any Bi - Metal corrosion,.
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Suggestion
We are all looking to apply a set "tension" in the bolted joint...so rusty bolts could be "torqued " 90% less than your high grade nicol based anti sieze or moly cote lubricated wheel nuts/bolts.....
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Suggestion
Dont want to drone on and bore people to death, but the realitive merits of torquing wheel nuts to a said setting are open to debate!
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Suggestion
From oil and gas experience, the choice of lubricatant can affect the amount of "bolt tension" applied at a set torque by up to 90%!!
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Suggestion
We are all looking to apply a set "tension" in the bolted joint...so rusty bolts could be "torqued " 90% less than your high grade nicol based anti sieze or moly cote lubricated wheel nuts/bolts.....
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Hi guys, i was wondering what the wheel nuts should be torqued to. I read 130nm somewhere but im not sure if thats right as it seems a little high. Im at work now so i cant check the manual. Also do i need some copperslip on the threads?
To be precise what you need is Castrol Optimol TA paste. It's not that easy to track down but they sell it here
http://www.fleetfactors.co.uk/lubricants-c8/pastes-c26/castrol-optimol-paste-ta-p312
100g will last you quite a while but I bought 2 to be on the safe side some time back![
]
Is any grease speced by Porsche? (manual says nothing about using grease or any "easing"). If you make it easier to turn the nuts then 130Nm will turn them further and that will put a higher pressure on the bolt / wheel junction. Seems to me adding any lubricant is going to result in over tightening (of the pressure point that is not being measured by the torque wrench).
??
I would have thought that you would want the bolt to turn as freely as possible to make sure that the 130Nm is applied to the wheel and not taken up by a lot of friction on a rusty old thread! The main purpose of using the paste is to stop the bolts rusting in place and then snapping off when you try to remove them.[&:]
Because the optimoly is only applied to the threads and not the collar, I assume it's transmitting the correct pressure to the wheel? The OPC's do it that way so lets hope they know what they are doing.
It's quite clear in the Owner's Handbook (see under "Wheel Bolts"). Apply Optimoly TA to the thread and between the bolt head and moveable spherical cap ring,
but not to the bearing surface of the spherical cap facing the wheel
and tighten to 130Nm (96 ftlb).
I have to agree with these guys I'm afraid.
http://www.pistonheads.com/gassing/topic.asp?t=658477
I have always used Copper slip for alloys on all my cars and have never suffered from any Bi - Metal corrosion,.
But could never have got the wheel off at times if it hadn't been there.
And I have never seen any Tyre fitter use anything other than copper slip
I'm not saying that Aluminum paste would not perhaps be better suited, I just think its a bit OTT. And don't see the need to rush to buy some just because its a Porsche wheel bolt
Gents
Dont want to drone on and bore people to death, but the realitive merits of torquing wheel nuts to a said setting are open to debate!
The most important factor when discussing "torque" settings is the application of lubricant. The actual co-efficient of friction differs massively between copaslip, grease and any number of other lubricants. From oil and gas experience, the choice of lubricatant can affect the amount of "bolt tension" applied at a set torque by up to 90%!! We are all looking to apply a set "tension" in the bolted joint...so rusty bolts could be "torqued " 90% less than your high grade nicol based anti sieze or moly cote lubricated wheel nuts/bolts.....
for once a good tight feel manualy appled is a lot more reliable than your torque wrench....
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