stud options?
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Mountain Pass
Joined: Mar 2009
Posts: 183
Likes: 12
stud options?
I'm just curious as to why, at least not that I've been able to find for reading, there isn't just an option for ARP bolts that aren't TTY?
I get that studs are the shiz-nit. But aside from extreme requirements, why isn't just buying a non TTY head bolt be a valid option from like ARP or something? Everyone just seems to be on either the OEM or the STUD paths.
??
I'm just curious.
I get that studs are the shiz-nit. But aside from extreme requirements, why isn't just buying a non TTY head bolt be a valid option from like ARP or something? Everyone just seems to be on either the OEM or the STUD paths.
??
I'm just curious.
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Mountain Pass
Joined: Mar 2009
Posts: 183
Likes: 12
I dont think i made sense.
With the exception of those that push crazy boost, why not just use ARP head bolts vs studs. If the TTY stretch factor is the failure point, ARP BOLTS I would think to be more than sufficient.
With the exception of those that push crazy boost, why not just use ARP head bolts vs studs. If the TTY stretch factor is the failure point, ARP BOLTS I would think to be more than sufficient.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Interesting question. Part of the answer is that the design of the stud results in less rotational torque being applied to the stud as its nut is tightened. That loads the shank more in a vertical plane with less twist. And is more accurate way of getting the tightness right. A TTY bolt isn't particularly "special" in its metallurgy. It's a high quality bolt, With a torque procedure that results in it stretching to or past it yield point. Some TTY bolts are designed to focus the stretch in a certain area of the bolt.
Here's some interesting info that doesn't get too technical.
Threaded Fasteners Torque-to-Yield and Torque-to-Angle - Engine Builder Magazine
Here's some interesting info that doesn't get too technical.
Threaded Fasteners Torque-to-Yield and Torque-to-Angle - Engine Builder Magazine
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Mountain Pass
Joined: Mar 2009
Posts: 183
Likes: 12
I completely understand the benefits of the studs, as well as the science of the metals and all that. No arguement.
What im getting at is OEM uses TTY head bolts, which fail. ARP are not TTY or at least have a much higher tensil strength and as a result, a much higher yield or stretch point. Studs are a pain to install, but worth it, especially if running high boost. But for those that run nominal boost but just want the insurance...why doesnt anyone just run higher quality head bolts that are not TTY?
What im getting at is OEM uses TTY head bolts, which fail. ARP are not TTY or at least have a much higher tensil strength and as a result, a much higher yield or stretch point. Studs are a pain to install, but worth it, especially if running high boost. But for those that run nominal boost but just want the insurance...why doesnt anyone just run higher quality head bolts that are not TTY?
Post Fiend
Joined: Oct 2009
Posts: 12,123
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From: N. Fort Worth, tx
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Cargo Master
Joined: Apr 2010
Posts: 3,236
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From: Shelbyville, Indiana
I'm thinking it'd be a PIA to use bolts for these heads. As a "Driveway Mechanic" I used the studs to help line everything up when I put the heads back on. However, I didn't pull Monster's body off the frame and I have to "man handle" everything on a gravel driveway. So the added insurance of hopefully never having to pull the heads again was all it took to convince me to use the studs!!
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Token Redneck
Joined: Jun 2007
Posts: 9,331
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From: Breckenridge, TX
Wouldn't the process for a non-TTY bolt be pretty much exactly the same as a stud? You just don't do the torque-angles at the end to yield the bolt.
Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
Interesting question. Part of the answer is that the design of the stud results in less rotational torque being applied to the stud as its nut is tightened. That loads the shank more in a vertical plane with less twist. And is more accurate way of getting the tightness right. A TTY bolt isn't particularly "special" in its metallurgy. It's a high quality bolt, With a torque procedure that results in it stretching to or past it yield point. Some TTY bolts are designed to focus the stretch in a certain area of the bolt.
Here's some interesting info that doesn't get too technical.
Threaded Fasteners Torque-to-Yield and Torque-to-Angle - Engine Builder Magazine
Here's some interesting info that doesn't get too technical.
Threaded Fasteners Torque-to-Yield and Torque-to-Angle - Engine Builder Magazine
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