993GT

the idea of using an inserted coolant pipe(into casing) isn't a horrible idea, but would have been much better if using a 'sealant' with a support(ie.pinned, retainer, screwed-in pipe fitting, etc) rather than a structural adhesive/sealant used on a performance-designed car which sees many, frequent heat-cycles

wross996tt

You are free to give your opinion of course, but don't come off as if you are stating a fact. You have provided no data. I doubt your engineering expertise has seen all applications of adhesives and not all adhesives are designed to fail in time.

Dock

Right...that must explain why I've see broken metal brackets, broken bolts, and broken welds.....?????

993GT

I'm not talking BS here, anyone can do the research themselves if they want to prove right or wrong...my 'opinion' is based on real-life experience as well as my own research, and from my family's background in engineering and chemistry
I'll be either pinning(along with a suitable sealant) or welding mine soon...I'm not waiting for a magic adhesive to replace the current adhesive
Cheers,

993GT

'well-designed'....'proper metallurgy'....

993GT

I'm not trying to anger anyone here, just stating that as wonderful as modern adhesives are, we shouldn't rely on them completely...

Dock

Yes.

928drvr86.5

Welcome to the group Rob.

993GT

Hi and Thanks Ben! sure is a lively bunch here, keeps the ideas fresh...
My father tells me you have a beautiful TT.

SSST

ill keep that in mind and mention it when the time comes. I've used these guys a couple of time for items not covered under the CPO. They really seem to know their stuff.

Dock

http://www.specialchem4adhesives.com...l.aspx?id=2360

http://solutions.3m.com/wps/portal/3...ons/Adhesives/

http://www.permabond.com/en/en-conta...=cyanoacrylate

http://www.cotronics.com/vo/cotr/ca_metallic.htm

http://www.henkelna.com/industrial/m...ives-13573.htm

http://www.firesleeveandtape.com/hig...sket-seal.html

Dock

http://www.gleicher.com/adhesives/structural-adhesives/

993GT

Dock, those all look like great adhesives/sealants/fillers, but they all still have a limited life-span, words like 'long-lasting' and such terminology is used indicating it might be a great product but is still not expected to last 'life-long'.
The space shuttle keeps being used as a halo example for adhesive use, however it is rated for up to 100 launches within 10 years 'operation life', perhaps due to the 'unknowns' of adhesives????...adhesives can have properties of strength in servere heat and vibration, etc usage, but I have yet to hear/see/know of any product which claims to 'completely' resist the effects of aging/atmospheric effects
Just don't want anyone using a 'new' adhesive on their coolant pipes thinking its a guaranteed 100% structural fix and have them blow out and cause an incident/injury to themselves or anyone else

Dock

Metal fasteners do not have an unlimited life-span. Additionally, Porsche didn't design the 996 Turbo to have an unlimited life-span.

When I designed an addition to my house, the engineering showed that a single LVL beam would meet the load requirements; however, I wanted to make sure the flooring that was going to supported by the beam would not have any movement, so I installed two LVL beams. This is what's called "muscling up" (stronger than needed), and it is a strategy that in many cases extends the initially calculated useful time. So in the Turbo's adhesive case, this would be like Porsche using an adhesive that exceeds the calculated stress, temperature, and stress requirements that were initially calculated. So assessing a particular adhesive in any of the links I provided has to be done within the framework of what the initial target calculations were for the coolant pipe connection was. If an adhesive exceeds the engineering requirements, then in many cases the longevity is increased.

I'll also say, again, that I no one has shown any data that indicates an unmodified and street driven (non-tracked) 996 Turbo has coolant pipe connection failures of any kind, and more specifically, catastrophic failures of any kind.

wross996tt

Well the NHTSA has opened an inquiry. I am hopeful this will be investigated and data will be needed to substantiate any actions. Just because no one has given YOU any data, does not mean it doesn't exist.