A slugfest where not a single punch was landed. Speech is not violence.
When I grew up, the phase "sticks and stones" was a widely accepted concept.
As the target of some of the speech, I must say that I was not offended in the least.
I was not triggered to respond. I respond because I have something to offer and I enjoy the give and take.
Those who don't enjoy it can simply look away.

I totally agree

Black 993, your are correct for us to be lucky to have knowledgeable people to help spread this knowledge and give up precious secrets.

I don't have a problem with Henry suggesting people use his head studs. I am sure they are a fine product that works well. What I have a problem with is Henry trashing another manufacturer's head studs that are known to work quite well and are certainly the more common choice of renowned performance engine builders in this country and probably abroad as well. That should not be allowed.

Most people that frequent this sub-forum research their product options here. You guys treat Henry as if he were some kind of deity. So, he should be held to a higher standard and not be allowed to mislead people here...and he is misleading people if he says the Porsche 993 Twin Turbo head studs do not work well.

Henry is certainly not a deity -- I think they got some things right in the Ten Commandments and idol worship remains a no-no in my book. So far as I can see from the closed thread, all he said was this:

You are free to agree or disagree. The man was sharing his opinion and it's completely legitimate for you or anyone else to ignore him or provide different information or whatever you like. But we're definitely not going to start policing people's opinions about head studs here.

I will make it a point to disagree with him then.

It's one thing for someone to offer up his opinion and quite another for a Pelican Parts vendor to push his product on Pelican Parts while misleading people about the viability of another company's product. I am surprised you don't see the issue there.....

Closed in 3.....2......1......

I don't see the issue because I don't see the situation that way. I don't see any conspiracy at all in fact. I saw someone offering an opinion about head studs. I have a great deal of confidence in the intelligence, resourcefulness, and judgment of the members of this forum to make good decisions for themselves about head studs and a great many other things as well. I don't like infantilizing people or protecting them from discussion and debate. We're grown men here, and most of us have built our own engines. Keep the faith. We're going to be okay.

Obsession...........
 

Scott,

You could be right but your disagreement with someone else is consuming you. I think you are trying so hard to convince people that he is wrong and it is obvious now it’s becoming your obsession. Life is too short. Take a deep breathe and move on. You are intelligent and smart and should know better to put yourself in this kind of situation.

Tony

That’s the problem today, everywhere is treated like a family restaurant.

In the religion of “Dilivar” like many other faith-based belief systems, suppression of the perceived “evil”, (in this case science) is fundamental.
The true believer must testify to the absolute validity of the dogma. Ostracizing, isolating, and demonizing the non-believer is part and parcel to this fixation. Virtue signaling and crusading for the “truth” is common among those with no life beyond “Dilivarism”.

My POV is the popular misconception (religion) that all Dilavar is verbotten. On the contrary, all is not. Moreso with earlier versions. However, if there are breakage/failure issues with 993 twin turbo Dilavar studs, I've yet to read about them. Perhaps that issue is being suppressed? Dunno. FWIW.

If Supertec head studs are at least equivalent to the 993 studs, but cost less, I'd head that way unless I'm a stickler for factory only parts.

Sherwood

This post has information on why Dilivar 993 Twin Turbo head studs may be better than steel:

http://forums.pelicanparts.com/11245580-post1.html

That thread is completely theoretical and dangerously close to mental masturbation. It’s easy to postulate the scenario, it’s another to actually quantify it. With close to 50 years of air cooled Porsche engines running around with a variety of head studs, you would think that there would be consensus. If bore distortion was a problem we would have seen it on a blow-by meter on the dyno. Since we do not, the theory is moot. While 993 Dilivar can do the job, Henry’s studs are a great alternative and fit nicely between steel and Dilivar as far as expansion rate.... if you feel that it’s a factor in your decision. Run what you feel like using,

So, you claim to be an engine builder and you don't believe bore distortion exists because you can't measure it with a BLOWBY METER?! Holey Snikes!

What if.....
We install sensors inside a bare cylinder bolted onto a fixture, then test various stud materials and how they and the cylinder distort and change dimensions under stress, etc. while cycling the top, middle and bottom cylinder sections at typical operating temperatures?

Sounds like such a test has been performed back in the early days of automotive engineering.

I recall a test on air-cooled motorcycle cylinders that showed the upper cylinder ID increasing relative to the cooler lower section of the cylinder. Thus, so called taper boring was introduced to compensate for heat expansion and to arrive at an evenly round bore at operating temperature.

S

Where do I say it doesn’t exist?

And who are you? We as engine builders have multiple builds spanding decades.... of empirical data. Post yours squirrel.

Get specific, tell us what you have found.

Do you really want to go there? Because I can gurantee that there are many more years of experience out there in the people using 993 Twin Turbo Dilivar head studs than there are in the people using Supertec head studs. The empirical data is on the 993 Twin Turbo Dilivar head studs' side!!!!

So hand me empirical data stating that you need it Scott. I can provide real data because I have done the tests. It’s the real life testing that follows concern for such things.Making generic arguments based on theory is a waste of time and results layman regurgitating conjecture.

What’s the max deviation of acceptable ovality from Mahle? It’s more than you would expect and much more than I like to run.

I just did a leak down on a 98mm 3.2SS both at room temp and 5 min after shut down. The results were the same @ less than 1%. That was with stock steel head studs. Dyno data backs up this test.