Allen head broached and tough!
05-10-2004, 09:34 PM
#1
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Allen head broached and tough!
The title says it all.
Stock head bolts TQ'd to stress levels higher than I like to see is around 14,000 lbs of clamping force. 170,000 PSI material 12mm studs are around 15,500 lbs. 190,000 PSI material 12mm studs are around 17,400 PSI and finally these....well they are from 220,000 PSI material and are nearly 20,000 lbs of clamping force
The "Real Deal" in head studs!!!
The top end of the studs are broached on the EDM machine here or done from the factory. Either way, it sure beats the heck out of the old double nut trick when removing and even installing them!!
No machine work to the block to fit is needed like with 14mm studs. You dont even need to remove the head. Just take out one bolt at a time and pop a stud in its place.
We worked with ARP to get these bad boys out and available. After months of work and manufacturing time...they are done and ready. I would not even consider another company for the job. They are top notch folks.
These are not the cheap Chinese studs I saw floating around earlier in the Cummins performace market and they are not thread cut before heat treatment. They are thread rolled after heat treatment as specified and stronger than any Chinese or aftermarket bolt with the same PSI rating material.
Stock head bolts TQ'd to stress levels higher than I like to see is around 14,000 lbs of clamping force. 170,000 PSI material 12mm studs are around 15,500 lbs. 190,000 PSI material 12mm studs are around 17,400 PSI and finally these....well they are from 220,000 PSI material and are nearly 20,000 lbs of clamping force
The "Real Deal" in head studs!!!
The top end of the studs are broached on the EDM machine here or done from the factory. Either way, it sure beats the heck out of the old double nut trick when removing and even installing them!!
No machine work to the block to fit is needed like with 14mm studs. You dont even need to remove the head. Just take out one bolt at a time and pop a stud in its place.
We worked with ARP to get these bad boys out and available. After months of work and manufacturing time...they are done and ready. I would not even consider another company for the job. They are top notch folks.
These are not the cheap Chinese studs I saw floating around earlier in the Cummins performace market and they are not thread cut before heat treatment. They are thread rolled after heat treatment as specified and stronger than any Chinese or aftermarket bolt with the same PSI rating material.
05-10-2004, 10:21 PM
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everytime I hear EDM or the best I know my pocket book is going to like talking into an empty 55 gallon drum. I know they are worth it (gotta pay to play) but just how much do I need to save up now 
DM01
DM01
05-10-2004, 10:48 PM
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Don,
Since you can change them without removing the head- Is there room to do it with the engine in the truck?
What (as a wag) do you think the max boost pressure the stock head gasket could take with these installed?
Since you can change them without removing the head- Is there room to do it with the engine in the truck?
What (as a wag) do you think the max boost pressure the stock head gasket could take with these installed?
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05-10-2004, 11:41 PM
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looks like I'll have for sale--26 fish weights--can be used a studs for a 24 valve in a pinch--so that I can get some of these new ones---
what's the torque rating on these things--I'm at 135lbs now with the existing ones---chris
what's the torque rating on these things--I'm at 135lbs now with the existing ones---chris
05-10-2004, 11:51 PM
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Part of the trouble in the past with TQ values was the inconsistant results obtained with engine oil and over the counter moly lube. ARP has developed a lubricant that will outperform moly and oil by a large margin.
The lubricant is included in the stud kit and only requires a 96 lb TQ value to get the full 20K clamp force. No more tq than this is required. If you retorque later and need to use oil...you would take them to 125. MAX. Never more. This gives you a 75% preload. Exactly what is needed.
Don~
The lubricant is included in the stud kit and only requires a 96 lb TQ value to get the full 20K clamp force. No more tq than this is required. If you retorque later and need to use oil...you would take them to 125. MAX. Never more. This gives you a 75% preload. Exactly what is needed.
Don~
05-11-2004, 08:18 AM
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Originally posted by signature600
Yeah, that picture of Brandon is really nice, and I'll bet he's looking for a new camera.
Chris
Yeah, that picture of Brandon is really nice, and I'll bet he's looking for a new camera.
Chris
Brandon - you have been awfully quite lately. Fess up, were you one of the beta testers for these things?
Guess I need to shut up and get in line for some, huh?
Matt
05-11-2004, 08:28 AM
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Originally posted by signature600
Yeah, that picture of Brandon is really nice, and I'll bet he's looking for a new camera.
Chris
Yeah, that picture of Brandon is really nice, and I'll bet he's looking for a new camera.
Chris
Brandon - you have been awfully quite lately. Fess up, were you one of the beta testers for these things?
Guess I need to shut up and get in line for some, huh?
Matt