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Location:
Melbourne
Registered:
January 2003
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Re: 4agte head torque settings with ARP studs?
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Sun, 07 August 2005 01:40
 
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This is really starting to sound very scary 
Lets see the standard torque setting is 22ft / 29nm ?
The required clamping force required on the head from the factory bolts is 300kg-cm , which equals 4266psi .
Now the Arp list torque settings for 10mm stud , lets say you are just torquring with oil not there special  grease
1. 170,000psi , 54 ft lbs x 1.356 = 73.22nm
2. 190.000psi , 61 ft lbs X 1.356 = 82.71nm
3. 220.000psi , 68 ft lbs x 1.356 = 92.20nm
now the preload of those settings are
1. 10.680 , 751 05kg
2. 12.015 , 844.94kg
3. 13.350 , 938.82kg
Bloody imperial US crap , had to do the coversions myself and its been 10years sice i had to do these loody maths , oldcorolla better check them  .
Now do you 60nm , or 44.24 ft lbs setting = 44.24 x 16.01846
= 708.65 = 10077psi
Now lets look at the stress on the block from 4266psi to 10077psi , 5811psi difference 408.65 kg .
To give you a idea of vehicles that might need a head torque of 60+nm , you would have to look to some engine with huge long headstuds under huge stresses , mostly caused thermal expansion . In short air cooler engines , most having 30>40cm long head studs . Not the piss short 4age ones 
What happens if you over torque head fixings , easy this has been around since the days of people increasing compression of side valve V8's The block pulls in around the area , ie you get oval of square bores , yes with a mega solid v8 block with large cylinder spacing . This has been fixed by the later v8's having five studs per cylinder to lower the required clamping force per stud . Shit even "Smokey yunick" didn't even see that coming for the newer generation of v8's .
Stud are different in the torquing to bolts , mostly due to the twisting forces and stretch , but i am not going into a what is a huge debate .
But looking at the facts , can a 4age block withstand the extra force - the stud stretch without becoming oval/square ? ,ahh more maths which can be worked out via there listing of stretch via arp part numbers .
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| | Subject | Poster | Date |
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4agte head torque settings with ARP studs?
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Big T | Sat, 06 August 2005 11:47 |
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Re: 4agte head torque settings with ARP studs?
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cri_ag | Sat, 06 August 2005 16:30 |
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Re: 4agte head torque settings with ARP studs?
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Big T | Sat, 06 August 2005 23:02 |
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Re: 4agte head torque settings with ARP studs?
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takai | Sat, 06 August 2005 23:37 |
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Re: 4agte head torque settings with ARP studs?
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Big T | Sat, 06 August 2005 23:53 |
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Re: 4agte head torque settings with ARP studs?
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improvedae86 | Sun, 07 August 2005 01:40 |
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Re: 4agte head torque settings with ARP studs?
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takai | Sun, 07 August 2005 03:49 |
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Re: 4agte head torque settings with ARP studs?
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Big T | Sun, 07 August 2005 08:24 |
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Re: 4agte head torque settings with ARP studs?
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Allan | Wed, 10 August 2005 10:14 |
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Re: 4agte head torque settings with ARP studs?
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improvedae86 | Sun, 07 August 2005 09:51 |
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Re: 4agte head torque settings with ARP studs?
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Big T | Wed, 10 August 2005 09:55 |
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Re: 4agte head torque settings with ARP studs?
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Big T | Wed, 10 August 2005 11:00 |
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Re: 4agte head torque settings with ARP studs?
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mrshin | Wed, 10 August 2005 12:36 |
