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1987 NA Factory Headers Stainless or Not? (Read 1720 times)
OK-944
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1987 NA Factory Headers Stainless or Not?
Apr 8th, 2019 at 6:29pm
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Have just given a header from my '87 NA to a welder to fix a crack, and I need to know what its made of...Stainless or non stainless steel? 

Sounds stupid I know...but I'm getting lots of conflicting info on this, and a web search is basically unproductive. 

At any rate, does anyone know, for sure, what was supplied from the factory, in 1987, for headers of my '87 NA...Stainless or Non Stainless?  Thanks!
  
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #1 - Apr 9th, 2019 at 7:36pm
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Yup...mostly non stainless, but apparently lots of stainless aftermarket units.

Right now I've got my eyes on a set of cast iron headers - sounds like they may never crack...
  
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OhioTom
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #2 - Apr 10th, 2019 at 5:28pm
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Hmm. I always thought late model ones were stainless.
I know mine has 300,000mi and not one spot of rust on it..

Not sure how it could be anything but stainless....
  

Tom Simpson&&VW/Porsche freak.
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #3 - Apr 10th, 2019 at 5:28pm
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Welder guy should be able to look at it and tell...
  

Tom Simpson&&VW/Porsche freak.
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #4 - Apr 14th, 2019 at 2:37pm
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If they are factory, not aftermarket, they are steel. In 1985.5 models is the material change from cast iron probably due to the turbo waste gate recycle gas. Chemistry is like that gases on the power stroke can burn super hot due to the covelant bond and travel at the speed of sound.The wave generated is what cracks the steel. Could be the extent of rust breaking it down but definitely some waste gas heat recovery is in the mix.About 10 min and a dremel tool you can see what you can see.

You could have a combination like the ones on my car 1985/5. See the attached pic the flange looks cast and the pipe looks lighter tubular steel. That might be because Porsche put in ceramic liner coating in the late models.

Take a look on Rennlist at Jim Pasha write up about LB/FT vs HP and typical RPM measure and street versus track use.
« Last Edit: Apr 15th, 2019 at 8:19am by anchor »  

20190414_074555.jpg ( 3788 KB | 20 Downloads )
20190414_074555.jpg
20190414_160955.jpg ( 3635 KB | 21 Downloads )
20190414_160955.jpg

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OhioTom
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #5 - Apr 15th, 2019 at 6:33pm
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The late model factory exh would not look that "good" if it were mild steel.

the tubing has zero rust or pitting on it. If it were mild steel, it would be fuzzy with rust.

Same with the whole exhaust system. Not one fuzzy spot or pitting anywhere (except for the cat).
  

Tom Simpson&&VW/Porsche freak.
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anchor
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #6 - Apr 16th, 2019 at 9:49pm
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I have a file that refuses to let me attach. Maybe like Friday this week otherwise ' No Joy' until I can make it into a PDF.

Grin
Http:/www2.us.porsche.com/English/USA/company/history/innovations/80.htm

Then search for Exhaust.docx, expect to find inside the exhaust document tool building, 15mm several throw away open end wrenches manufacturing with oxy/ acetylene torch and vice.
Purpose to tune your exhaust closer to your needs.
Find also ideal gas law P1×V1/ T1= P2×V2/T2

Mild steel and aluminized steel are different. It is plain to distinguish in that the life of aluminized steel does not rust. It does not imply these are not original exhaust Porsche manufactured parts. Difference is aluminized coating it is still tubular steel which is all I ever implied. See attached chart

This I hope will help solve the back pressure on the test pipe when crimping the coupling and other O2 questions.
Hope the link works.just tried 'no joy' ( top gun movie phrase from Jester the instructor " I was below the deck Maverick, so no joy, the rules of engagement were not adhered to.")
« Last Edit: Apr 18th, 2019 at 6:54am by anchor »  

download.jpeg ( 16 KB | 32 Downloads )
download.jpeg

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anchor
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #7 - Apr 18th, 2019 at 10:43pm
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Here it is
  

EXHAUST.pdf ( 296 KB | 27 Downloads )

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OhioTom
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Re: 1987 NA Factory Headers Stainless or Not?
Reply #8 - Apr 22nd, 2019 at 7:15pm
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Yep, so Aluminized steel is coated. The coating wears off and the rust starts running away under neith. Just like your chart shows.

If you look at the 400 series stainless, the "used" look is exactly correct to what we see on late model cars.

Also, as one who works with 400 series stainless steel, I can tell you that heat likes to make it crack.
Thus the 300 series stainless that is meant for welding and hot applications.
  

Tom Simpson&&VW/Porsche freak.
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