Which head studs for a 964 rebuild?

[Turbo_pro]

Originally Posted by KNIGHTRACE

Turbo-pro You mentioned my name above asking me to explain my "thought" process on delivar. I think more than most do.

My question wasn't do you think about the parts you use but what are the features of the 993 TT stud that leads you to believe they are the right choice?
Simply, tell us why you use them. Please

[KNIGHTRACE]

Jim I will answer based on my experience. Henry told me I am misunderstanding you therefore I will give an answer that may help some on the forum and I apologize in advance for misunderstanding the thread.
I use the 993 TT studs when I am building high power motors over 400 hp typically. I ran a 3.5 turbo for 3 years at 2 bar of boost. I never had a stud failure with 993 TT studs. My heads on my race motors are running over 400 degrees so there is a lot of stress on the studs.
I like the Supertech stud and I am using it on a build presently. I have used supertech studs on some street builds with no problems. The early slick delivar studs are a very different delivar than the 993TT studs. The early delivar 3.0/3.2/3.3 studs should not be used in a motor in my opinion. The reason I have not tested more supertech studs is because there difficult to acquire therefore I dont have a lot of experience with them. I have seen some issues on higher HP builds with ARP and Raceware. They dont break just dont expand enough is my opinion and cause other issues. That being said If your building a 250 hp street motor they would be fine and I have used many Arp head studs. I have had excellent results with the factory cheep steal studs on high HP race cars.
If I were an enthusiast building my on street hotrod I would use Supertech
I sincerely hope this helps the forum and answered your question, WILLIAM KNIGHT

[KNIGHTRACE]

Jim, I got your private message and replied I dont think it went through having lots of trouble with my Mac. However Thank you for the message and I am sorry I misunderstood you. I am Thankful for the forum to help many people it is one of the positive things that keep me going through the last two years of difficulty. Have a great weekend. I posted here because I dont thing the private message made it out . William

[Turbo_pro]

Originally Posted by KNIGHTRACE

Jim, I got your private message and replied I dont think it went through having lots of trouble with my Mac. However Thank you for the message and I am sorry I misunderstood you. I am Thankful for the forum to help many people it is one of the positive things that keep me going through the last two years of difficulty. Have a great weekend. I posted here because I dont thing the private message made it out . William

William, thank you. I was hoping for something a little more technical [it's how my brain works] but your response is appreciated.
When I load ammunition, I want to understand bullet weight, powder load, muzzle velocity and expected trajectory.
When I look to experts for tyre recommendations, I want to know aspect ratio, wear and traction ratings.
I don't build my own engines so I have to rely on experts [like yourself] for technical data to aid in my decisions about how I want my project to proceed.
These types of forums are where I get that data.
Again, thanks for your participation on this forum.

[KNIGHTRACE]

My general starting point on those two subjects, BC and tread wear numbers. The tread wear number would help lots on the site. maybe a good subject. William

[Neil Harvey]

Originally Posted by Turbo_pro

William, thank you. I was hoping for something a little more technical [it's how my brain works] but your response is appreciated.
When I load ammunition, I want to understand bullet weight, powder load, muzzle velocity and expected trajectory.
When I look to experts for tyre recommendations, I want to know aspect ratio, wear and traction ratings.
I don't build my own engines so I have to rely on experts [like yourself] for technical data to aid in my decisions about how I want my project to proceed.
These types of forums are where I get that data.
Again, thanks for your participation on this forum.

Some vendors may be reluctant to give up their specs. Totally understandable. I do not know what others makes theirs from but we have ours made from 17-4 stainless and the heat treat is to H900 spec.

I have no issues giving up this info, because, as a supplier and user of high quality parts, I want to know what I'm buying and using.

We made Head studs years ago, maybe the only other place that did, other than Porsche. I even remember Henry coming to PD and looking at our studs.

Our latest version incorporates many features that are not about the strength or efficiency, rather about the ease of use. The upper hex makes installation easier, and adjusting the required height even when the heads are installed. Tighten the nut and find you do not have enough threads exposed, easy, just loosen the nut, and unwind the stud with the nut already attached.

We use a Titanium washer and nut to help with the heat stress and use this material as an insulator. We have found steel nuts do expand under temperature and can loose their grip.

Builders and assemblers will use what they think are the best. As long as the stud does not fail in its use, there is nothing else that should be said. Its good there are choices for everyone to chose from.

We design and have our own made for what we want to see in a stud. We have studs that have a 12.00mm thread at one end for stronger anchoring into the case as well. We saw a need so we designed a stud for this. Same for the through bolts with the center dowel. We saw case shifting and designed (kinda copied) a stud for this. Porsche did this years ago and we redesigned ours with added features.

[Henry Schmidt]

For those who need 993 twin turbo studs and nervous about getting counterfeit replacements, we have a few sets that we pulled from band new 993 cases.
I hate to throw them away but I won't use them. Email me for a great price.

[KNIGHTRACE]

I will offer $100 to save them from the garbage.

[Henry Schmidt]

Originally Posted by KNIGHTRACE

I will offer $100 to save them from the garbage.

And everyone says you don't have a sense of humor....
You showed them.....lol

[KNIGHTRACE]

I disagree. I have great sense of humor. Happiness cant exist without laughter. WK

[nene]

Well said!!!!

Originally Posted by neil harvey

yes you are correct. I'm not well known in the porsche world as i stay in the background supporting many of the shops you listed.

My background is not building porsche engines like many of the shops you listed. My background was spending many years building engines for f1, cosworth and bmw, then coming over here and building some indy engines before working for toyota building the imsa 4 cyl turbo engine, v6 offroad and the toyota atlantic engine. Then spending a few years working for andial in the race engine dept., doing all the dyno testing on the 962c engines and some other porsche race engines. After leaving andial, i started pd continuing building 962c race engines, some air cooled turbo engines and when the water engines came in around 2000 developing many parts for those. A few years ago when we were asked to build high end high performance air cooled engines we set about designing and developing parts for the air cooled engines, many shown in my air cooled developments post on this site.

So, yes we are not well known in the air cooled "club" scene as we have been too busy designing and building slightly more developed engines.

I wonder, does that make me capable of building a less developed porsche air cooled club engine? Don't know myself. That i will leave up to customers to come to me and ask.

Btw, i'm buried with work building engines with parts we developed and shown in my air cooled developed parts on this site.

I'm tired, i need to lie down and take nap.