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Old 01-30-2014, 04:24 PM   #1
outfrontmotorsports
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Default Outfront Motorsports 1/2" Stud Torture Test, compared to ARP 2000 and 625+

The results are in, we just performed the ultimate head stud torture test on uncut video (soon to be uploaded).

we tested a stock fastner with a snap-on digital torque wrench with torque recall.

the stock fastner gave way at 125ftlbs. at this point the stud felt like it was deforming/growing (it did not pull out)

11mm ARP2000, this fastner torqued to 166ftlbs (from memory) when the fastner had no more to give. it also appeared to be stretching

11mm 625+ this fastner torqued to 185 ftlbs when it wouldn't go any more, it also started to stretch

this shows that these two studs above are really at their max torque (75% of yield)

The New Outfront 1/2" head stud torqued to 201ftlbs and then our socket broke. getting a new socket we torqued it to 233ftlbs, the fastner still felt strong and no feeling of stretch.

torque facts from ARP
ARP 11mm 2000= 15,700 pounds clamping at 90ftlbs cost $220 220ksi
ARP 11mm 625+= 18,000 pounds of clamping at 100ftlbs cost $520 260ksi
Outfront 1/2= 20,500 pounds of clamping at 140ftlbs cost $480 220ksi
Our studs do require block and head machining that we can do for $270

there is zero reason for spending the money on timeserting the block for 11mm studs. it is clear that there is no "pullout" of any stud before the yield was met or at 233ftlbs!

we will start a new "stud torture test" thread

Give us a call at 714 994 5222
Outfront
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Last edited by outfrontmotorsports; 01-30-2014 at 09:31 PM.
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Old 01-30-2014, 04:48 PM   #2
Paidfor
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Freakin awsome!!!!!!!!!!!!!!!
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Old 01-30-2014, 04:56 PM   #3
outfrontmotorsports
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More info: we went to take the fastners out of the block. the 1/2 unit unscrewed by the allen at the tip of the stud.

but guess what?...........................both of the 11mm units could not come out of the block using the allen (or should I say my allen started to strip out)

beings that these studs used in this test are junk, we just put a stud removing tool on them to get them out. they did not come out easy and felt like the threads in the block were not OK any more.

So Chris (KillerBee) there is your answer: threads pulling out of the block with stock 11 mm threads appears to start happening at 140-170 ftlbs. pull out of the 1/2"ers are unknown at this point. it also proved that there is no weakness in the block (at least at 233ftlbs) I might add we did find a weakness with our kit. The 1/2" 12point nut did not move on our stud. this test damaged the nut!

Outfront
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Old 01-30-2014, 05:11 PM   #4
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In for the video!
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Old 01-30-2014, 05:13 PM   #5
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Love it!
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Old 01-30-2014, 05:35 PM   #6
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Love all the work and effort you guys put into helping us out. Knowledge is power!
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Old 01-30-2014, 06:44 PM   #7
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Old 01-30-2014, 07:14 PM   #8
m.bryant
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Haha, another great video and love the stand setup!

I know I torqued my 1/2" studs to 110 on the outside and 120 in the middle using the stock torquing sequence at John suggested.

I fear no evil
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Old 01-30-2014, 08:05 PM   #9
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Now that you've done that test do you think you'll cut up that block to see the threads? IF you can get those studs out that is.
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Old 01-30-2014, 08:15 PM   #10
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I like that! I approve!
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Old 01-30-2014, 08:27 PM   #11
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You guys have an email. ignore the machining question as you answered it above.
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Old 01-30-2014, 08:28 PM   #12
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email replied.

Last edited by outfrontmotorsports; 01-30-2014 at 09:03 PM.
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Old 02-06-2014, 07:41 PM   #13
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We will be running a one day sale on these tomorrow. It will be a one time deal FYI.
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Old 02-06-2014, 08:21 PM   #14
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Very nice. I approve. You guys notice the inner threads vs outer threads more easily damaged? With regular sized studs specifically. From the cutaway the front looks thinner at the bottom.
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Old 02-07-2014, 12:17 PM   #15
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Old 02-07-2014, 01:20 PM   #16
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great post. thanks for the info.
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Old 02-07-2014, 02:30 PM   #17
cnstman
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thank you for doing this.
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Old 02-07-2014, 02:55 PM   #18
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I just ordered a set of these headstuds among other things... Jeremy was a great help in getting the order squared away. Thanks!
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Old 02-11-2014, 01:23 AM   #19
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Quote:
Originally Posted by cnstman View Post
thank you for doing this.
Thank you, just tapped another three blocks today!

we have some big names running these studs, we are excited to hear the
results. we even have a company talking to us as our studs cost less retail
than it cost him to make his 14mm studs and our studs install with less headaches.

Outfront
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Old 02-11-2014, 01:36 AM   #20
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This might be a stupid question but can you relate this too boost pressure/horse power?

I assume they are designed to hold 35+ psi?
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Old 02-11-2014, 01:55 AM   #21
outfrontmotorsports
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Quote:
Originally Posted by jdpsearcher View Post
This might be a stupid question but can you relate this too boost pressure/horse power?

I assume they are designed to hold 35+ psi?
Crystal Impreza and others have run our previous 1/2 stud to the 40psi range, our new 1/2 stud is even stronger, easier to install and machine for. I would say the next weak link will be more in the head gaskets than the studs at this point, we are exploring the idea of using and testing torque values and effects with some pressure sensitive film

stay tuned

Outfront
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Old 02-11-2014, 10:15 AM   #22
Crystal_Imprezav
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Like using this stuff? A head of you on that one

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Old 02-11-2014, 10:40 AM   #23
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Its always great when I hear there's new things getting developed for our engines.

Great work Outfront

Screw the studs, $50 engine plate? Sweet deal
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Old 02-11-2014, 10:48 AM   #24
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Quote:
Originally Posted by wrxsubiemod View Post
Its always great when I hear there's new things getting developed for our engines.

Great work Outfront

Screw the studs, $50 engine plate? Sweet deal
was that a pun^^^ screw the stud
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Old 02-11-2014, 10:49 AM   #25
jnorth85
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That Engine plate is pretty genius
Great work on the studs guys! Cant wait to get my motor running, we just need some of this snow to melt!
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