We've long been building 996/997 GT1 based engines here and a problem that we've faced is the limitation of the ARP head studs which we the only option available at the time (really designed for 993 motors). No longer... check these babies out

http://www.sharkwerks.com/products.php?pid=251

Design Inspiration:
Most head gasket failures on these Porsche engines are due to the heads lifting from stretched or weak OEM or other aftermarket head studs. EVO has developed a direct replacement head stud kit that eliminates this problem. These head studs have been CAD engineered and implement critical design features for improved strength and durability. The materials undergo heat-treatment and test procedures including Torque-Tension, Tensile, Fatigue and Micrography to ensure consistency of each head stud that we produce. The stringent manufacturing process is carried out by companies with many decades of experience building the highest quality fasteners for the aerospace industry serving companies like Boeing, Bombardier, Dassault, GEAE, Pratt & Whitney, Rolls Royce, Euro Copter, Safran and automotive race teams such as Ferrari, BMW, Renault, TRD and many others.

Benefits:
· CAD Engineered in house with a - ZERO restriction - ground up approach for uncompromised quality
· Better materials and better design equals a better head stud. This translates into better head clamping force
· Direct replacement for the OEM head studs – No Machining Required
· Utilizes the OEM flanged nuts
· Engineered and manufactured in the USA

Technical Details:
· Manufactured with the highest grade - heat treated and stress tested H-11 tool steel
· Utilizes 260KSI tensile strength material for optimum strength
· Heat-treatment procedures are sealed and strictly controlled to ensure optimal consistency
· 44 mm of thread length (engine case side) verses 24 mm of thread length (stock and other aftermarket studs)
· 83.3% more thread surface contact with the engine case
· Incorporates a machined “Dog Point” end at the case side of the stud
· Bottoms out inside the engine case to disperse the thread load
· Reduces engine case thread fatigue
· Machined “HEX” broach at the end of the stud for easier
installation
· Machined with rolled threads for improved strength
· Designed to use with the OEM flange nuts
· Minimized thread length on the top of the stud for
increased stud strength
· 27% more clamping force than the leading brand head
stud @ 80% torque yield
· 38% more clamping force than the OEM head stud @ 80%
torque yield
· Capable of 15,244 lbs. of clamp force at 95% torque yield
· Precise torque specifications / procedure for consistent
clamp pressures

Conclusion:
Besides creating a stronger head stud, we incorporated features to make them easier to install and developed an installation procedure to help ensure proper head sealing. Our multi step torque process was developed to minimize installation torque variables and yield the most accurate clamp pressures. SharkWerks utilizes these head studs in all GT1-block motor builds.

We are using these even on our GT3 engine builds:
http://sharkwerks.com/porsche/techni...e-upgrade.html

 

Great write up Alex. Up to what psi boost can you push these studs?

 

They've been tested to go well beyond 1.5bar. I'll let Todd chime in here (congrats on the new baby btw) but 30PSI isn't an issue for them...

 

Thanks Alex. I know they could go well beyond that psi level. The crazy thing is none of us know at what point the heads will start to lift, I'm thinking beyond 35psi. But again who wants to stress these motors I will test them I guess Great looking studs by the way, good work Todd and EVOMS.

 

Alex,

How do these studs differ from the 12mm HS I have in my motor, other than the obvious and machining of course.

Ben

 

Congrats

These have been tested on a 996 turbo at 30 lbs of boost? This was accomplished with a stock block, stock gaskets and stock heads without the usual O rings and other goodies? This was accomplished without retorguing etc.. that most of us have to go through to get our heads to stay down?? If so HUGE breakthrough and congrats!

Robert

 

More details, photos and pricing can be found in the vendor classified section here:

https://www.6speedonline.com/forums/...ml#post2537517

 

yeah baby!! thanks alex and evoms!! in the shopping cart
tim

 

Todd
Great page but I do not see my questions being answered that I ask above??
Once again congrats
Robert

 

Robert,

There are MANY different factors to consider when building an engine and how a head stud will perform. 30 PSI of boost is not the only determining factor when it comes head sealing. Factors such as head flow, combustion, cylinder temperatures and other critical occurrences during an engines power producing process will also dictate how an engine can handle 30 PSI of pressure. If the engine is properly built, with good flow, these studs will allow enough head clamping pressure to hold 30 PSI of boost without the other head sealing procedures that you listed above.

 

Hello Ben,

The 10mm head studs were designed from the 12mm studs that are in your engine. Since many potential engine builds will not require the additional machine work and expenses associated with our 12mm stud conversion, we developed this direct replacement stud as well. Our 10mm studs were engineered and manufactured using the same design principals and materials as the 12mm studs and are a tremendous upgrade over the OEM or the other studs commonly found in the aftermarket. Our 10mm studs will be sufficient for most applications except for the ones that want to go to the extreme

 

Robert,

There are MANY different factors to consider when building an engine and how a head stud will perform. 30 PSI of boost is not the only determining factor when it comes head sealing. Factors such as head flow, combustion, cylinder temperatures and other critical occurrences during an engines power producing process will also dictate how an engine can handle 30 PSI of pressure. If the engine is properly built, with good flow, these studs will allow enough head clamping pressure to hold 30 PSI of boost without the other head sealing procedures that you listed above.

 

^Todd, I hope you saw the video I sent to Joe. See you in Texas and we can talk more in person.
cheers, art

 

I have these 12mm going into my car as we speak. Congrats on the baby Todd. Are my heads done? Also I emailed you a few questions yesterday, please send the answers when you get a minute.

Jag

 

Thank you Todd,

Congrats to you and Jenn to the new addition to your family. I hope Jenn and your new bundle of joy are doing well

Cheers,

Ben