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johncmng's Avatar
Join Date: May 2006
Location: San Jose, CA.
Posts: 247
What are thermal reactor?

Are they the same as Catalytic Converter?
Old 06-04-2007, 10:11 AM
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Join Date: May 2007
Posts: 26
Nope, totally different. On 911s they are big cans under each bank of cylinders. They get heated up by the exhaust and serve as an area to further react the exhaust gases and partially unburned fuel after it's been used and ejected out of the cylinders.

Our host has a diagram of the parts. Look in the 74-77 911 catalog under exhaust.
1977 Porsche 911S
Guards Red/Cork, no sunroof, no flares!
Old 06-04-2007, 10:35 AM
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jkarolyi's Avatar
Join Date: Feb 2004
Location: Socialist Republic of California
Posts: 2,128
Nope, they were what Porsche used before the catalytic converter was designed and introduced on the 911SC. They were used on the California market '75 models, and all US '76-77 models.

I'm not sure how they were supposed to operate...(edit: see above explanation) but the intent was to superheat the exhaust gases to reduce emissions. These were very restrictive systems and caused the engine to run very hot as well. These engines also had a five-blade fan which further increased engine temps. The result was that most 2.7s with thermal reactors had a short life span.

If you have these on your car, make plans to remove them pronto! Almost all have been removed by this point.
Old 06-04-2007, 10:51 AM
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