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-   -   Why doesn't broken head stud destroy the engine within a few seconds ? (http://forums.pelicanparts.com/porsche-911-technical-forum/1060270-why-doesnt-broken-head-stud-destroy-engine-within-few-seconds.html)

sugarwood 05-08-2020 11:42 AM

I think people who rub their car with a diaper, drive it 200 miles a year, and mothball it 6 months a year since they only drive in 72F or warmer are more likely to suffer broken head studs. Sad !

juanbenae 05-08-2020 12:13 PM

^^^^ that shows just how informed you really are.

proporsche 05-08-2020 12:30 PM

Quote:

Originally Posted by juanbenae (Post 10857202)
^^^^ that shows just how informed you really are.


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Rawknees'Turbo 05-08-2020 01:06 PM

The lower/exhaust sides break because the dilivar alloy used was garbage (until the 993TT version) - plenty of instances reported where brand new ones broke upon assembly, which rules out corrosion being the only negative factor.

911pcars 05-09-2020 11:58 AM

The cylinders slide into spigots in the crankcase. 4 studs/cylinder, anchored in the case, snake through each cylinder and each cylinder head. The one-piece cam housing then clamps onto the three cylinder/cylinder head assemblies as one structural assembly. So no.

One or several head studs, even if simultaneously breaking, will not allow a cylinder to fall out or shift to any appreciable distance to implode the engine. This is not to say the engine cannot self-grenade. That requires other major component failure to occur. I’ll leave that scenario to your follow up question.

Sherwood

Bob Kontak 05-09-2020 01:05 PM

Quote:

Originally Posted by sugarwood (Post 10857152)
I think people who rub their car with a diaper, drive it 200 miles a year, and mothball it 6 months a year since they only drive in 72F or warmer are more likely to suffer broken head studs. Sad !

Maybe you could get a copy of Bruce Anderson's 911 Performance Handbook and read through it. It would be an investment in your credibility.

Seriously. It's old school. Pretty cool stuff and Anderson is a good writer.

Bob Kontak 05-09-2020 01:08 PM

Quote:

Originally Posted by Rawknees'Turbo (Post 10857277)
The lower/exhaust sides break because the dilivar alloy used was garbage (until the 993TT version) - plenty of instances reported where brand new ones broke upon assembly, which rules out corrosion being the only negative factor.

Lion's share is pitting and axial shear post heat cycling.

Tell your Mom I said Hi.

Rawknees'Turbo 05-10-2020 11:58 AM

Quote:

Originally Posted by Bob Kontak (Post 10858557)
Lion's share is pitting and axial shear post heat cycling.

Tell your Mom I said Hi.

Agreed with that - amazing how weak and non-resilient those studs are (must be millennial "studs" :D).

You sister just gave my mom your message, bro! :)


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