what is the tool called and size that i need for the ARP bolt? just trying to get everything i need to retorqe the head if it needs it. thank you
ARP head bolt tool????
- Thread starter mk3tattoos
- Start date
I fully expected to pop a few sockets on this job, so I bought six craftsman 1/2" sockets. Never did break one, so I still have them all.
I used a shallow socket with a 3" extension. I went to 95ft lbs on a Felpro gasket. Socket never felt like it wanted to slip.
I used a 3/8 drive torque wrench that maxed out at 100 ft lbs. So i took in to consideration for not being very accurate plus twist from the extension 95 ft lbs seemed like a good number to go with.
dont waste the money on snap on unless you work on cars for a living or expect to use the socket for more than the bolts. Craftsman, come with lifetime guarantee and for that one socket save you about 40-50 dollars. Mine as well did not slip when i did my head gasket.
89nasupra;1549581 said:
Having extensions wont affect the final torque , they do twist but your torque wrench wont click until there is the set torque on the actual bolt
incorrect! the torque wrench measures torque at the head of the wrench, the twisting of the extension will effect final torque as it twists exponentially and applies a different torque at the socket end. this is why it is harder to get a bolt off with a longer extension. this is especially so with a smaller size wrench. i recommend a 1/2" drive torque wrench with as little extension as possible.
there is a formula for figuring out exactly how it effects the final setting, but i cant find it right now!
there is a formula for figuring out exactly how it effects the final setting, but i cant find it right now!
fixitman04;1549900 said:
It has been like this for 6 months now. The longest my car has run between tare downs. I wanted the extra piece of mind knowing they are tight.
Northbaysupra,
I did this with out looking for repercussions on here. Don't go to 95 thinking it is the right thing. I did this on MY car. I would recommend you follow the propper steps and torque values provided by ARP. My bolts were on then taken back down then put back on. If you are starting fresh, follow ARP specs.
The formula is:
S = handle setting
T = torque applied at end of adapter
La = Length of handle in inches
Ea = Length of extension in inches
S = TxLa/(La+Ea)
If the extension you are using is more than 2in. in length you need to use this formula (i.e. an extended crows foot). A regular 6in. extension that allows for access to deeply recessed bolts you do not need to use this formula.
S = handle setting
T = torque applied at end of adapter
La = Length of handle in inches
Ea = Length of extension in inches
S = TxLa/(La+Ea)
If the extension you are using is more than 2in. in length you need to use this formula (i.e. an extended crows foot). A regular 6in. extension that allows for access to deeply recessed bolts you do not need to use this formula.
Are you guys talking about extensions as in increasing leverage or extension meaning 90 degrees from the torque wrench?
Im pretty sure OP is talking about length extension so he can get into the recessed area:
not this kind of extension:
Im pretty sure OP is talking about length extension so he can get into the recessed area:
not this kind of extension:
fixitman04;1549900 said:
Don't know who told you this, but is is way wrong. A straight extension on a socket does not have a significant effect on setting torque.
89nasupra;1549996 said:
I'm glad you posted this disclaimer. Here's why: ARP bolts are limited to 75 ft/lbs on an aluminum head due to the difference in heat expansion for aluminum vs the steel block. 95 Ft/lbs is almost a 20% over torque...that greatly reduced the safety margin ARP has designed for their bolts. More is not better when setting head bolt or stud torque values
PROJECT N00b;1550024 said:
QFT
dont know where you are getting your info , but i am right. do a little experiment. with a good torque wrench tighten a bolt to 100 ft-lb with a 12 " extension, then check it with the same setting on the same wrench without the extension. you will have to tighten it up at least a 1/8 of a turn to reach the same torque. i got my information in multiple places including machinist school. it is called torsional deflection. ever seen tire torque sticks.. this is how they work.