what are ARP studs and bolts? what do they do?

[the t3d]

i hear everyone on here has got these for their supra
i've seen 'em around but i have no idea what they are or what they are used for? do they help anything? someone let me know if it's worth getting!!!!!!
thanks

 

[s383mmber1]

i hear everyone on here has got these for their supra
i've seen 'em around but i have no idea what they are or what they are used for? do they help anything? someone let me know if it's worth getting!!!!!!
thanks

There worth every penny. Especially when you go with a Metal head gasktet.

 

[TobyCat]

ARP is a brand of fastener.

Bolts are well ... bolts. Most people talk about head bolts, which just hold down the head to the block.

Studs are a little different than bolts that instead of a solid "torquing" end, there is a nut. This is a little better as bolts tend to flex - think of a metal rod twisting. A stud wont twist, but instead provide an even torque as the threads pull the head down to the block.

Hope this helps

-Chris

 

[JMDigital]

They REPLACE the head bolts you have from toyota. They are a MUST if you are moding for more power. Yes get them. Studs OR bolts. They both replace the same part, pick one to get. They you torque them to 75Lbs. (i think) Change them 1 at a time if you are not changeing the head gasket. However if you are going for more HP a new head gasket would be a wize idea. METAL if you can afford it. Im in clearwater also What year is your supra and what color I may have seen you arround.

 

[jdub]

ARP Torque Specs:
Bolts - 75 ft/lbs w/ moly
Studs - 81 ft/lbs w/ moly, 105 ft/lbs with 30W motor oil.

 

[JMDigital]

ARP Torque Specs:
Bolts - 75 ft/lbs w/ moly
Studs - 81 ft/lbs w/ moly, 105 ft/lbs with motor oil.

Thanks.. ! I knew someone would know. :icon_bigg

 

[Idealsupra]

They REPLACE the head bolts you have from toyota. They are a MUST if you are moding for more power. Yes get them. Studs OR bolts. They both replace the same part, pick one to get. They you torque them to 75Lbs. (i think) Change them 1 at a time if you are not changeing the head gasket. However if you are going for more HP a new head gasket would be a wize idea. METAL if you can afford it. Im in clearwater also What year is your supra and what color I may have seen you arround.

youve seen his car....he bought the white NA i was fixing at my house

 

[Reign_Maker]

i hear everyone on here has got these for their supra
i've seen 'em around but i have no idea what they are or what they are used for? do they help anything? someone let me know if it's worth getting!!!!!!
thanks

ARP makes the strongest fasteners available... Very important when going for upgraded performance... The stock head bolts are fine for stock to slight power upgrade, but when going for BPU *basic performance upgrade* or more, you need to start looking into upgrades that strengthen not just build power...

 

[Reign_Maker]

youve seen his car....he bought the white NA i was fixing at my house

And you didnt give him a basic lesson on 7Ms before he drove away? lol... Wait... He did DRIVE it away, right? hehehehee

 

[Reign_Maker]

ARP Torque Specs:
Bolts - 75 ft/lbs w/ moly
Studs - 81 ft/lbs w/ moly, 105 ft/lbs with 30W motor oil.

OOOOHH MUH GAWD! I actually did 105 with moly... :aigo: Should be ok, right?

 

[jdub]

Well...ARP torque specs are rated at 75% of fastener yield strength...w/ moly, that comes out to 108 ft/lbs (81 ft/lbs divided by .75).
Doing the math, you are just under the rated strength by 3%.


I'd give ARP a call and ask for their recommendation...can you back off the torque or do the studs need to be replaced.

 

[bigaaron]

The fasteners might be ok, but 108ft/lbs is a whole lot of torque on an aluminum head. Think about it, that is almost double what the stock spec was. At some point the head will deform around the bolt holes and/or between the bolt holes.

 

[jdub]

The fasteners might be ok, but 108ft/lbs is a whole lot of torque on an aluminum head. Think about it, that is almost double what the stock spec was. At some point the head will deform around the stud holes.

Good point! The ARP torque spec for head bolts is 85 ft/lbs for moly and 110 ft/lbs w/ 30W motor oil, but there is an exception. ARP recommends a 75 ft/lb spec w/ moly for bolts on an aluminum head (like ours).

I never have figured out why that is true for bolts but not studs. I called ARP and didn't get a good answer...they stuck to the 81 ft/lb w/ moly spec for studs. I kinda gave up...6 ft/lbs is not that big a deal.

 

[the t3d]

They REPLACE the head bolts you have from toyota. They are a MUST if you are moding for more power. Yes get them. Studs OR bolts. They both replace the same part, pick one to get. They you torque them to 75Lbs. (i think) Change them 1 at a time if you are not changeing the head gasket. However if you are going for more HP a new head gasket would be a wize idea. METAL if you can afford it. Im in clearwater also What year is your supra and what color I may have seen you arround.

i have a white 87 na
you haven't seen me around, because my car is stuck in my driveway due to some registration/title problems. i'm droppin the gte motor in sometime later on.
so, i'd probably get the ARP studs or bolts then...so from what i'm hearing, everyone prefers the studs over the bolts? how easy/hard is it to replace the stock ones with these?

thanks for the replies guys

 

[Shytheed Dumas]

Well I went with bolts due to ease of use - it is no harder to replace with ARP's then with stock bolts. From what I hear, if you use studs then pulling/resetting the head on the block can be a bit of a PITA if the block is still in the engine bay, and since I wasn't having mine machined for a MHG, I stuck with the bolts.

I pretty much wish I had gone with the studs, though. Torque is much more consistent across the head, and there is more chance of a bolt backing itself out if you had dirt, etc left in the block. Next time I will pull the block, have it decked, and definitely go with the studs.

 

[the t3d]

yea i could probably get the ARP studs done right before the gte motor goes in for easier installation. that works for me...thanks alot for the replies gentlemen!!!!

 

[JMDigital]

youve seen his car....he bought the white NA i was fixing at my house

Oh.. ok! ha! So he saw my car there then? That was when you were working on my injectors and stuff. He was coming to look at it or something? BTW Still want that front bumper from your friend when he is ready

 

[starscream5000]

If you get studs, then the HG will just slide right on without worries of it sliding around and ruining the seal as you would with bolts.

 

[Reign_Maker]

Well...ARP torque specs are rated at 75% of fastener yield strength...w/ moly, that comes out to 108 ft/lbs (81 ft/lbs divided by .75).
Doing the math, you are just under the rated strength by 3%.


I'd give ARP a call and ask for their recommendation...can you back off the torque or do the studs need to be replaced.

Well, I could always back them out a bit, but with the amount of boost and hp Im gunna be runnin, 105 was what was recommended...

If you get studs, then the HG will just slide right on without worries of it sliding around and ruining the seal as you would with bolts.

??? um, that's why you have those two little dowl pins... They hold the hg in place and align the head when you set it down...

 

[jdub]

Well, I could always back them out a bit, but with the amount of boost and hp Im gunna be runnin, 105 was what was recommended...

105 ft/lbs with motor oil...not moly. Your call man
Hope it didn't distort your head like Aaron talked about.