Head stud torque?
I'm running a 1.8 sleeved to a 2.0 L, Garrett GT3071R and seemed to be making good power. Took it out on a cold day (30 degrees) and was running 18 PSI of boost. I had a backfire in the engine and it blew the head gasket. Now here is my question. The ARP head studs are recommended to be torqued to 65 ft lbs., is this too low for the level of boost that I'm running?
Thank you in advance for your help. |
The lubed ARP head studs are recommended at 65 ft-lbs so no it is not too low.
How do you know its the head gasket? Head Gasket Brand: Mileage: 18 psi on 12:1cr?... |
We would need more info, either, head/block wasn't flat enough, detonation, both?
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Originally Posted by maxpro
(Post 1463069)
I'm running a 1.8 sleeved to a 2.0 L, Garrett GT3071R and seemed to be making good power. Took it out on a cold day (30 degrees) and was running 18 PSI of boost. I had a backfire in the engine and it blew the head gasket. Now here is my question. The ARP head studs are recommended to be torqued to 65 ft lbs., is this too low for the level of boost that I'm running?
Thank you in advance for your help. |
Originally Posted by psyber_0ptix
(Post 1463096)
What do you think will happen when you torque them even tighter?
Id guess that something will break and the guy will see zero gain from over torque. |
Torque and head gasket
Originally Posted by Zsanz
(Post 1463080)
The lubed ARP head studs are recommended at 65 ft-lbs so no it is not too low.
How do you know its the head gasket? Head Gasket Brand: Mileage: 18 psi on 12:1cr?... |
Originally Posted by psyber_0ptix
(Post 1463096)
What do you think will happen when you torque them even tighter?
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Originally Posted by maxpro
(Post 1463131)
I was just wondering if the boost was too much and raising the head from the block. Thanks for your help.
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Originally Posted by maxpro
(Post 1463069)
I'm running a 1.8 sleeved to a 2.0 L, Garrett GT3071R and seemed to be making good power. Took it out on a cold day (30 degrees) and was running 18 PSI of boost. I had a backfire in the engine and it blew the head gasket. Now here is my question. The ARP head studs are recommended to be torqued to 65 ft lbs., is this too low for the level of boost that I'm running?
Thank you in advance for your help. |
Originally Posted by patsmx5
(Post 1463134)
I have lifted a head with stock head bolts, lubed with engine oil, torqued at 45 ftlbs, with 23 PSI boost. (bad torque wrench). I have run ARPs at 65 ftlbs, with the arp lube, to 40 PSI and not lifted a head. I now run ARPs at 72 ft*lbs with bigger washers at 35 PSI and no problems. I'd check your torque wrench and see if the head/block is warped.
Thanks, this is very helpful. Just curious what size washers did you go with? Thank for your help. |
People have cracked heads before several times from going over 65lb. I would not recommend. Esp since many of us have gone to 350-450 on standard arp's without issue
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Originally Posted by 18psi
(Post 1463143)
People have cracked heads before several times from going over 65lb. I would not recommend. Esp since many of us have gone to 350-450 on standard arp's without issue
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That's a good approach.
Higher boost shouldn't matter until you get into the really high numbers (think 30+ on healthy snail that can maintain that pressure for a broad range). Over tightening fasteners will yield or strip them 9 times out of 10. |
Originally Posted by maxpro
(Post 1463141)
Thanks, this is very helpful. Just curious what size washers did you go with? Thank for your help.
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One of our earlier builds on a 1600, we over torqued the ARP's. The engine would just hit a wall at 6k on the dyno and was pumping a lot of oil/breathing heavy. Fortunately our tuner had seen it before and called it quits.
Sure enough, newly machined block was ovaled. A re-bore and reassemble head to 65 on the studs(maybe 60?) and every thing was good again. |
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