I fail to see the comedy in all of this but I read some post above that it is comedy gold.. I am thankful someone can get something positive out of this. I had rather try to distribute something called "GRACE" that seems to be lacking on many keyboards the days.
I simply do not want Henry or Winders in a silly conflict, They're both helpful to different sets of people. Winders has helped even his competition.

Dude, you have to try and see what all this self righteous hand winging is about.
This is just "panties in a twist" about a "one star" review.
If that isn't hysterical, I don't know what is.

I can't believe you keep getting manipulated into playing along.


http://forums.pelicanparts.com/uploa...1643266454.png

Not so sure it's comedy gold, but it is certainly a lesson in humility.

If this is a post to suggest that my delivery lacks "humility" you are correct. When it comes to the technical aspects of the 911 Mezger engine, honest, accurate information is more important than cultivating consensus.

Hi Neil
There is plenty of business to go around. Sourcing our specific material during these supply chain issues can ad delays. Any new stud design that seeks to overcome the Dilivar stud ridiculousness makes sense.
As an experienced Porsche engine builder (with a great reputation) why did you find a desire to enter the market?

Why anyone would use anything other than the Supertec stud is silly. Everything else on the market is not fit to use even in a generator, especially the turbo dilavar stud that is known to be inferior to anything short of Chinesium.

The answer is simple. Some first time builders are trying their best to navigate a process (very rewarding from my POV) in agreement with what they took apart. (Trying not to reinvent the wheel) To that end, adhering to the legacy build process has merit.
For those builders, there is an exceptional option manufactured by Canyon Engine Components. They are available from our host. They are a direct replacement for the Dilivar and steel stud used by the factory, will out perform the 993TT non-sense at a cost easily justifiable. How do I know this? I have direct knowledge of the design, metallurgy and manufacture process.
https://www.pelicanparts.com/More_Info/93010117002.htm?pn=930-101-170-02-INT

That's good to know, thanks! I have the Supertec in my motor.

I wonder if PMNA or Porsche Motorsports UK are using that dilavar garbage?

Vous avez raison @noir993, je suis d'accord avec vous !

Oh brother.

Or maybe, through willful ignorance, a certain opinionated builder, with no engineering background, insists on ignoring the importance of differential expansion, and refuses to acknowledge the extremely high reliability of the 993TT stud, which is now the only replacement stud offered through Porsche Classic parts.

I will reply, but in another thread. Give me the weekend to do this. I do have to make a living too. I will answer your question, add engineering as well as "brand" reasoning.

As a mechanical engineer and first time engine builder it has been frustrating to navigate some parts of the build process. Its clear that steel studs work in this application, and early in my build process 4 years ago I was advised by Chris Flavell that steel Studs from Porsche were a cheaper option that would work fine for a stock 930 rebuild. So I bought a set from Porsche. As my build goals warmed up a bit,.with bigger intercooler and free flow exhaust / headers I had the funds available to purchase the Supertec head stud kit. Peter Dawe recommended them as more affordable than the 993 studs.
Neither of these purchases were based on what I would call data. These are parts that have been proven to work in service. I am not sure how anyone other than OEM could do an engineering evaluation of this type of assembly. The joint gets tighter everytime you start the engine. An ideal joint would have a clamping set on assembly.by stretch or torque, and the tension in the fastener would not change in service. It seems like this head stud can change tension due to thermal loads, and possibly engine loads, this is a very complex situation to analyze.
I worked on a National Science Foundation project studying coefficient of thermal expansion of some low expansion materials, Invar being one of them. The time and effort to actually get valid data on that project was mind blowing.
At my current job we did some repairs to a high pressure high temp piping system, 800 psi and up to 1400 deg F service temp. How do we test the repair to be sure it's safe to operate the system? The last section of the high pressure pipe code I read through said if there are no other possible ways to test the system then an in-service test is acceptable. In service test means clear the area of people, turn on the system and ramp up to full pressure and temp and see if it fails. Slightly scarey when it's a 3 million dollar system of inconel pipe your testing.

So to sum up, I am really growing tired of each camp screaming louder and louder that they are right and everyone else is wrong.
To those people screaming the loudest, sit the **** down and chill out. Listen to what other people are saying, then bring some data to the table to move this conversation forward.
I would like to continue to learn about this complex puzzle called an engine that's laying on my work bench.

As a consumer, honestly , I would buy the ones that were suggested by the person who mans up and admits that the other person is allowed their point of view and moves on with the business at hand. Have you ever heard of a screen door on submarine? you have not because it doesn't make sense. just like this argument.

If "that's all Porsche offers" is your go to claim of undeniable excellence, perhaps you'll explain the low quality (compared to many after market sources) of the 9mm rod bolts the Porsche sell?
9mm being used on 3.2, 3.3, 964 and 993.

Bickyd and reclino sorry for this thread it seems very nonproductive and I apologize. The purpose of the forum is to help people and share information. It is not about promoting a product. There is a vast amount of good information in the forum.

Henry, your going off topic bringing rod bolts into it ,let's try to focus on the head stud discussion. See below for a critique of your argument tactic.
https://en.m.wikipedia.org/wiki/Ad_hominem

Look up member "Lorenfb" and see what happens when enough potential customers respect the knowledge but not the messaging.

It has been my experience (20+ years in highly technical B-B sales) that people do business with people that they like. The others vote with their feet and their wallets.

I come to Pelican to seek the tactile facsimile I cannot otherwise get because there is four feet of snow outside and I will not drive my car in the winter. My choice. If the external vendors think that the consumer is not judging the character of these vendors by their conduct in the forums then they are mistaken. I have many Pelican stickers on my toolbox and they belong there. Pelican has to be responsible as well because the last thing I want when I step into the house of Pelican is to step into piss because they cannot seem to keep their floors clean. If you reply that " They won't miss your business anyway" , or "who do you think you are?". That is not the point. The consumer is due the respect of his opinion and so does the visitor. I will not comment further.