Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical Chat

Post Reply
 
LinkBack Thread Tools Display Modes
Old 02-04-2017, 05:35 AM   #1
Registered User
 
Dave80GTSi's Avatar
 
Join Date: Sep 2016
Location: Central Ohio
Posts: 399
Composition of the exhaust manifold catalytic converters

Does anyone know the construction composition of the primary catalytic converters, the one integral to the exhaust manifolds, as shown?

Specifically, are they metallic or are they ceramic?

Thanks - DM



__________________
2000 Ocean Blue Boxster S
1980 Ferrari 308 GTSi
2019 Alfa Romeo Giulia Ti Sport AWD
Dave80GTSi is offline   Reply With Quote
Old 02-04-2017, 07:16 AM   #2
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,261
They are a ceramic honey comb which is coated or impregnated with metals such as platinum which fosters the desired chemical reaction to reduce pollutants in the exhaust stream.
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote
Old 02-04-2017, 04:45 PM   #3
Registered User
 
Dave80GTSi's Avatar
 
Join Date: Sep 2016
Location: Central Ohio
Posts: 399
Interesting, thank you!

So the manifold cats are made of ceramic, while the secondary cats further back are metallic-core based?
__________________
2000 Ocean Blue Boxster S
1980 Ferrari 308 GTSi
2019 Alfa Romeo Giulia Ti Sport AWD
Dave80GTSi is offline   Reply With Quote
Old 02-04-2017, 05:18 PM   #4
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,261
Quote:
Originally Posted by Dave80GTSi View Post
So the manifold cats are made of ceramic, while the secondary cats further back are metallic-core based?
No, the are both ceramic with metal coating/impregnating.

Why are you asking?
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote
Old 02-05-2017, 04:58 AM   #5
Registered User
 
Dave80GTSi's Avatar
 
Join Date: Sep 2016
Location: Central Ohio
Posts: 399
I recently cut open a secondary cat that some guy had tried to gut, apparently using something like a crow bar and a sledge hammer.

These cat cores are made of metal, so that his efforts to break up the core simply bent it all into a metallic lump. Presumably had the core been ceramic, it is brittle enough so to break up into small chunks under such crow bar force.

My original question was out of curiosity, simply to wonder if the manifold cats were also made of the same metallic construction.

Seems to me that a ceramic core would hold up better under the higher heat exposure so close to the engine.

Thanks - DM



__________________
2000 Ocean Blue Boxster S
1980 Ferrari 308 GTSi
2019 Alfa Romeo Giulia Ti Sport AWD
Dave80GTSi is offline   Reply With Quote
Old 02-05-2017, 05:50 AM   #6
Registered User
 
steved0x's Avatar
 
Join Date: Dec 2012
Location: FL
Posts: 4,143
Stealth cat delete pipes
steved0x is offline   Reply With Quote
Old 02-06-2017, 02:07 PM   #7
Registered User
 
AZ986S's Avatar
 
Join Date: Jun 2016
Location: Arizona
Posts: 379
Funny, I just pulled mine.
Now I understand the "restriction" thing...
Next item on the list: high flow exhaust headers!
__________________
2002 Boxster S - NHP 200 Cell Headers,test pipes,Borla CatBack,Competition Plenum,74 mm TB, EVOMS Tune,Tarett UDP,Eibach Swaybars,BIlstein PSS9s,TuneRS rear toe links,wheel studs,15 mm wheel spacers on all 4,EBC yellow stuff pads,Sebro rotors, EBS oil baffles,160 deg Thermostat,2 quart Accusump,full filtration remote oil filter,rad fan switch,custom gauge/switch plate, Race Capture data logging, 90K miles
AZ986S is offline   Reply With Quote
Old 04-15-2017, 03:34 PM   #8
Registered User
 
Dave80GTSi's Avatar
 
Join Date: Sep 2016
Location: Central Ohio
Posts: 399
Quote:
Originally Posted by Dave80GTSi View Post
I recently cut open a secondary cat that some guy had tried to gut, apparently using something like a crow bar and a sledge hammer.

These cat cores are made of metal, so that his efforts to break up the core simply bent it all into a metallic lump. Presumably had the core been ceramic, it is brittle enough so to break up into small chunks under such crow bar force.

My original question was out of curiosity, simply to wonder if the manifold cats were also made of the same metallic construction.

Seems to me that a ceramic core would hold up better under the higher heat exposure so close to the engine.

Thanks - DM
Now able to answer my own question.

Both the manifold and the secondary cats are identical in construction materials, and both are made of a non-ceramic metallic honeycomb.

So you can't bust a thru hole via brute force, a crowbar, and a sledge hammer. Like someone - not me - tried to do, as shown in the picture which I posted here earlier.

DM

__________________
2000 Ocean Blue Boxster S
1980 Ferrari 308 GTSi
2019 Alfa Romeo Giulia Ti Sport AWD
Dave80GTSi is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 02:23 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page