ARP head studs...overtorque them?
12-21-2003, 04:51 PM
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ARP head studs...overtorque them?
I recently blew my headgasket running nitrous. I have ARP Head Studs and I torqued them down to the recommended 60 ft lbs in the instructions. I retorqued them after 1000 miles. I was told by a reputable engine builder that they have had problems when torqueing them down to the recommended 60 ft lbs. He said they torque them to 70-75 ft lbs. Is anyone else torqueing their studs more than the stock specs? I am a little weary of this because I always like to do things by the book.
12-21-2003, 04:56 PM
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Re: ARP head studs...overtorque them? (turbotypeR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbotypeR »</TD></TR><TR><TD CLASS="quote">mine and several others are at 80lbs</TD></TR></TABLE>
Should I torque them that high on a D16?
Should I torque them that high on a D16?
12-21-2003, 05:11 PM
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Re: ARP head studs...overtorque them? (RyanCivic2000)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 »</TD></TR><TR><TD CLASS="quote">
Should I torque them that high on a D16?</TD></TR></TABLE>
that i don't know.mine called for 74lbs if i remember right,i went by what several others on the board told me they did.call arp and ask for tech.they should be able to help
Should I torque them that high on a D16?</TD></TR></TABLE>
that i don't know.mine called for 74lbs if i remember right,i went by what several others on the board told me they did.call arp and ask for tech.they should be able to help
12-21-2003, 05:25 PM
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Re: ARP head studs...overtorque them? (turbotypeR)
The D16 stud is smaller and shouldn't be torqued that High. Endyn and many others (Earl I believe) shouldn't be torqued any higher than 5 ft lbs above stock.
12-21-2003, 05:26 PM
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Re: ARP head studs...overtorque them? (turbotypeR)
You should slightly overtorque your ARP's. How much on a d16, i'm not sure. If stock spec is 60, I'd do 65-67. I could be wrong though.
12-21-2003, 05:27 PM
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60ft/lbs seem kind of loose but the manufactorer gives its torque specs based on the strength of the stud. if you torque past those specs u may just be stretching the stud and not making it any tighter
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12-21-2003, 05:35 PM
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Re: (99B16Si)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99B16Si »</TD></TR><TR><TD CLASS="quote">60ft/lbs seem kind of loose but the manufactorer gives its torque specs based on the strength of the stud. if you torque past those specs u may just be stretching the stud and not making it any tighter</TD></TR></TABLE>
Endyn and others say only 5 ft lbs to prevent head warpage not because of the limit of the stud.
Endyn and others say only 5 ft lbs to prevent head warpage not because of the limit of the stud.
12-21-2003, 05:40 PM
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Re: (99B16Si)
stock D head bolts are torqued between 49-53lbs depending if its a A.Z or Y..All ARP studs on Ds should be tq to 60-62lbs.I saw that spark plug post ryan,your ARP stud tq didnt blow the head gasket,I say it you had too much timing in it.
Modified by D-Man at 10:02 PM 12/30/2003
Modified by D-Man at 10:02 PM 12/30/2003
03-18-2005, 03:42 PM
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Re: (ladysman)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ladysman »</TD></TR><TR><TD CLASS="quote">
Endyn and others say only 5 ft lbs to prevent head warpage not because of the limit of the stud.</TD></TR></TABLE>
how can a head warp if its being held in one place? i didnt think aluminum could melt....
Endyn and others say only 5 ft lbs to prevent head warpage not because of the limit of the stud.</TD></TR></TABLE>
how can a head warp if its being held in one place? i didnt think aluminum could melt....
03-18-2005, 04:49 PM
#11
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i torqued my LS/vtec facotry bolts to 86ft/lbs, but that doesnt help much.
i thought there was 2 different psecs for ARPs studs, one with one kind of lube and the other with oil??
i thought there was 2 different psecs for ARPs studs, one with one kind of lube and the other with oil??
03-18-2005, 04:53 PM
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Re: (Mr. JDM-GSR)
We did 70 on our most recent Z6 build, but I cant tell you how well its gonna work.
BoostedHybrid says hes never had a SOHC issue, and he does them all to 80 ft/lbs.
BoostedHybrid says hes never had a SOHC issue, and he does them all to 80 ft/lbs.
03-18-2005, 05:00 PM
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man i used oil on aebs head studs -pre-tq'ed to 10lbs w/oil, oil on the nuts at the 78 ft lbs provided on an ls/vtec set up, and it leaked like a bast.
theyre being redone this time with loctite on the studs, oil on the washers, and either ARP moly lube or loctite on the nuts at 85 lbs.
when i took the head off, half the studs were tight, while the other half could be turned by hand....
im guessing the p30/b16 head/.040 millage had something to do with it, so its getting tq'ed a lil harder this time around.
theyre being redone this time with loctite on the studs, oil on the washers, and either ARP moly lube or loctite on the nuts at 85 lbs.
when i took the head off, half the studs were tight, while the other half could be turned by hand....
im guessing the p30/b16 head/.040 millage had something to do with it, so its getting tq'ed a lil harder this time around.
03-18-2005, 05:22 PM
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Re: (soLSvtec12kcraze)
I just did my Z6 studs to 63 ft/lbs and I plan on doing 65 after a few heat cycles. The ARP Tq spec is supposed to be 75% of the yeild strength if i remember correctly.
03-18-2005, 05:29 PM
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Re: (Bailhatch)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bailhatch »</TD></TR><TR><TD CLASS="quote">I just did my Z6 studs to 63 ft/lbs and I plan on doing 65 after a few heat cycles. The ARP Tq spec is supposed to be 75% of the yeild strength if i remember correctly.</TD></TR></TABLE>
yield strength??? fill me in pour favor....
yield strength??? fill me in pour favor....
03-18-2005, 05:33 PM
#17
Re: (soLSvtec12kcraze)
cut and paste for ya...
yield strength (1) The stress necessary to produce significant plastic deformation in a material under uniaxial tensile or compressive load. (2) The stress on a stress-strain curve at the yield point .
and then...
yield point The coordinate on the stress-strain curve of a material in uniaxial tension or compression representing the onset of significant plastic deformation. Typically the fracture point for brittle materials and the coordinate at an offset strain of 0.2% for ductile materials .
So basicly its past the point where the fastner is so distorted or fractured that it doesnt meet the paramaters of whatever standard tests are done.
Hey I'm from Maine too!
yield strength (1) The stress necessary to produce significant plastic deformation in a material under uniaxial tensile or compressive load. (2) The stress on a stress-strain curve at the yield point .
and then...
yield point The coordinate on the stress-strain curve of a material in uniaxial tension or compression representing the onset of significant plastic deformation. Typically the fracture point for brittle materials and the coordinate at an offset strain of 0.2% for ductile materials .
So basicly its past the point where the fastner is so distorted or fractured that it doesnt meet the paramaters of whatever standard tests are done.
Hey I'm from Maine too!
03-18-2005, 05:48 PM
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Re: (soLSvtec12kcraze)
from what i understand, if you over torque them to much you just cant reuse them.
i dont think your going to warp your head at 75 ft/lbs
on my new setup, mine our at 65.. and i pre torqued them into the block 15 ft/lbs
i dont think your going to warp your head at 75 ft/lbs
on my new setup, mine our at 65.. and i pre torqued them into the block 15 ft/lbs
03-18-2005, 06:06 PM
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Re: (platinum00)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by platinum00 »</TD></TR><TR><TD CLASS="quote">from what i understand, if you over torque them to much you just cant reuse them.
i dont think your going to warp your head at 75 ft/lbs
on my new setup, mine our at 65.. and i pre torqued them into the block 15 ft/lbs
</TD></TR></TABLE>
alright, i went 15 with the threads this time around and loc-tited them, tomorrow the heads going back on at probably 80-85...just to be on the safe side...im pretty sure thats why they came loose the first time was from using oil as lube and the 12.5 CR....
i dont think your going to warp your head at 75 ft/lbs
on my new setup, mine our at 65.. and i pre torqued them into the block 15 ft/lbs
</TD></TR></TABLE>
alright, i went 15 with the threads this time around and loc-tited them, tomorrow the heads going back on at probably 80-85...just to be on the safe side...im pretty sure thats why they came loose the first time was from using oil as lube and the 12.5 CR....
03-18-2005, 06:11 PM
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Re: (soLSvtec12kcraze)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by soLSvtec12kcraze »</TD></TR><TR><TD CLASS="quote">
alright, i went 15 with the threads this time around and loc-tited them, tomorrow the heads going back on at probably 80-85...just to be on the safe side...im pretty sure thats why they came loose the first time was from using oil as lube and the 12.5 CR....</TD></TR></TABLE>
Are you running D or B, 85 is a bit much for the D, and i hope your not runing boost iwth 12.5 CR
alright, i went 15 with the threads this time around and loc-tited them, tomorrow the heads going back on at probably 80-85...just to be on the safe side...im pretty sure thats why they came loose the first time was from using oil as lube and the 12.5 CR....</TD></TR></TABLE>
Are you running D or B, 85 is a bit much for the D, and i hope your not runing boost iwth 12.5 CR
03-18-2005, 06:23 PM
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Re: ARP head studs...overtorque them? (turbotypeR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbotypeR »</TD></TR><TR><TD CLASS="quote">mine and several others are at 80lbs</TD></TR></TABLE>
83ft-lbs with MOLY LUBE for my AEBS and Golden Eagle headstuds!!!
No probs!
Edit:B series at least sorry
83ft-lbs with MOLY LUBE for my AEBS and Golden Eagle headstuds!!!
No probs! Edit:B series at least sorry
03-18-2005, 06:52 PM
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Re: ARP head studs...overtorque them? (Boostfed.com)
stud is 7ft pounds in the block, when i bolted on the head i did them in 4 steps with the last one at 63ft/lb. ARP MOLY LUBE was used .. 10 minutes between each step. so far so good on 11psi.
03-18-2005, 06:59 PM
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its an NA ls/vtec, b18b/b16 head, set up.
its good to hear about the 83 moly stud and no problems....i went 15 installing the studs with loctite. i figure im never going to take them out again anyway...knock on wood....and 85 with nuts, oil washers, then see how it goes.
its good to hear about the 83 moly stud and no problems....i went 15 installing the studs with loctite. i figure im never going to take them out again anyway...knock on wood....and 85 with nuts, oil washers, then see how it goes.
