Another broken Divilar head stud sob story

[rokemester]

Originally Posted by 911pcars

Porsche engineers may be myopic on occasion, but seldom outright stupid. There was a reason for those different materials. Something about different operating temperatures/environments top and bottom. Don't put them in the same category as GM or Ford and others. I only wish for excellent hindsight when I'm creating/designing new stuff. :-)

Sherwood

How shortsighted of those Porsche engineers not to know that 26 years into the future old farts like me would be driving their racing machines around like little old ladies. Sorry GUILTY as charged! Although I really work to get that car up to speed as often as humanly possible without an Autobahn nearby.

[mr911er]

In the UK, Porsche engine rebuilders recommend that the latest Dilavar studs are used to replace headstuds during an engine rebuild. Is this just because they cost five times as much as steel?

[suprxman]

Rokemeister.
I have actually been to Solon a couple of times. Isn't Drew Carey from there, or close.
Went to Sea World a couple of times and stayed in Solon. Nice area and found a fantastic donut shop somewhere around there that used real whipping cream inside the donuts. Beer and donuts go great together.
Sorry for the hijack.

[911pcars]

Originally Posted by mr911er

In the UK, Porsche engine rebuilders recommend that the latest Dilavar studs are used to replace headstuds during an engine rebuild. Is this just because they cost five times as much as steel?

Only in the UK? Don't think so.

Dilavar is a steel alloy (~180ksi), albeit with a coefficient of expansion similar to aluminum/mg.

Maybe the Porsche tax or copycat repair applies, but most reputable repair shops select parts and materials that provide a repair and service life that minimizes comebacks and ensures customer satisfaction. In that regard, there are different opinions among many reputable builders. That said, there is consensus in many areas of Porsche-car maintenance and repair. However, that isn't necessarily true for tomorrow.

Not every shop specs the most expensive in every category - which brings me to this continuing observation: Disregard the tired saying, "You get what you pay for", (This doesn't apply to owners with bottomless checkbooks).

Sherwood

[DohertyCM]

I think you are missing the main issue....why he broke the stud?

If he is running the car too hot, then he needs to tend to that problem as well, don't you think?

[rokemester]

Originally Posted by suprxman

Rokemeister.
I have actually been to Solon a couple of times. Isn't Drew Carey from there, or close.
Went to Sea World a couple of times and stayed in Solon. Nice area and found a fantastic donut shop somewhere around there that used real whipping cream inside the donuts. Beer and donuts go great together.
Sorry for the hijack.

If you ever get to Solon you need to make sure you look me up. There is a Dunkin Donuts in town but I don't think that's the shop you are referring to. We'll have our own cars and coffee. Good luck with your unit.

My car runs pretty cool with 15W-40 Rotella T even in the hottest days we get around here low 90s. Last summer I drove the car pretty hard (at least for me) and had a hard time getting the temp above 200 deg. F. maybe occasionally up to 220 deg. F.

http://forums.pelicanparts.com/uploads2/tempmarks1080755488.jpg

[scbates930]

Originally Posted by 911pcars

FWIW, "Divilar" and "Dilivar", if accurately identified, are knockoffs of genuine Porsche Dilavar head studs. As such, they're not the real deal and probably made from some inexpensive, not-to-spec, good-enough material. It's like a "Rolex" watch that lasts 2 weeks. Rolex doesn't like knockoffs. Neither do unsuspecting consumers.

If it's merely a misspelling on your part, you could have an earlier version of the real thing (black coated are version 3 or 4). The fully threaded versions (993) are the latest. I think Dilavar studs were offered in at least 4 versions through the years including a defective batch from the factory.

Sherwood

I suffered a broken Divilar headstud, it was picked up during a regular service, and a few years later I'm getting the engine rebuilt to take care of this and a few other age related items. The engine shop confirmed that even on 3 bolts the cylinder had not moved.