Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > C7 Corvette > C7 Tech/Performance
Reload this Page >

Testing the effectiveness of a Catalytic Converter shield

Notices
C7 Tech/Performance Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Testing the effectiveness of a Catalytic Converter shield

 
Old 09-06-2018, 06:05 PM
  #1  
LivinTheDream
CF Senior Member
Thread Starter
 
LivinTheDream's Avatar
 
Member Since: Aug 2003
Location: 60 miles from BGKY
Posts: 290
Thanked 8 Times in 7 Posts
Default Testing the effectiveness of a Catalytic Converter shield

Hello folks,

Having read a number of posts regarding shielding the driver side cat, I purchased the DEI b/c it's not overly expensive, and can be easily removed. To my knowledge, none of the vendors publish numbers stating the temperature drop one can expect. Forum members have shared anecdotal data suggesting the oil temperature does not appear to drop--so I knew what I was getting into.

I used a FLIR 165 camera to read the temperature at the middle of the cat, shielded and unshielded sides. I think the 165 is well suited for this kind of test. For the shielded side, I used emissivity settings of .9 and .95, which seem reasonable given the type of material and texture. The unshielded side was more of a guess, as it's metal, but not polished, so I used .3, .4, .7, and .75. I did not capture any images this time.

I put the car up on the QuickJack, installed the shield, then started the car, letting it idle for 15 minutes. I then took measurements from approx two feet away. There is little difference between sides (240 degrees F +/10 degrees), when using the .3 or .4 coefficient for the unshielded side. Using .7 or .75, the unshielded side read cooler, so those measurements were thrown out. The temperature on the shielded side was basically the same at .9 or .95.

Are these shield wraps worth it? I don't know, but it seems reasonable to expect the shielded side to read a noticeably lower temperature, even after idling for 15 minutes. Perhaps the test is invalid b/c the cats did not get hot enough. Maybe my methods (coefficients) are wrong for one, or both materials. I'm sure the vendors monitor the forum, so perhaps they will weigh in with their own test results, and the methods used.

Curious what others think, and thanks for reading--
LivinTheDream is offline  
The Following User Says Thank You to LivinTheDream For This Useful Post:
Gonzo (01-29-2019)
Old 09-06-2018, 06:31 PM
  #2  
Bill Dearborn
Tech Contributor
 
Bill Dearborn's Avatar
 
Member Since: Oct 1999
Location: Charlotte (formerly Endicott, NY) NC
Posts: 32,812
Thanked 3,325 Times in 2,225 Posts
Default

I asked a Ford Engineer I know to review that design. He said the cat shouldn't heat the oil due to radiation. The cat doesn't have a high emissivity and the cooler doesn't have a high emissivity/absorption.

Bill
Bill Dearborn is offline  
The Following User Says Thank You to Bill Dearborn For This Useful Post:
Gonzo (01-29-2019)
Old 09-07-2018, 10:19 AM
  #3  
LivinTheDream
CF Senior Member
Thread Starter
 
LivinTheDream's Avatar
 
Member Since: Aug 2003
Location: 60 miles from BGKY
Posts: 290
Thanked 8 Times in 7 Posts
Default

Originally Posted by Bill Dearborn View Post
I asked a Ford Engineer I know to review that design. He said the cat shouldn't heat the oil due to radiation. The cat doesn't have a high emissivity and the cooler doesn't have a high emissivity/absorption.

Bill
Thank you for commenting, this makes sense. I've presented the results to DEI and asked for their test methodology. Will follow up with a phone call.

Will keep folks posted. Worst case scenario, yank it off and get a refund.
LivinTheDream is offline  
The Following 2 Users Say Thank You to LivinTheDream For This Useful Post:
Gonzo (01-29-2019), Harris (09-07-2018)
Old 09-10-2018, 02:41 PM
  #4  
LivinTheDream
CF Senior Member
Thread Starter
 
LivinTheDream's Avatar
 
Member Since: Aug 2003
Location: 60 miles from BGKY
Posts: 290
Thanked 8 Times in 7 Posts
Default

Originally Posted by LivinTheDream View Post
Thank you for commenting, this makes sense. I've presented the results to DEI and asked for their test methodology. Will follow up with a phone call.

Will keep folks posted. Worst case scenario, yank it off and get a refund.
UPDATE: DEI has not contacted me, which suggests they have no proof to offer. Shame on me--an engineer that knew better. Products like this must back their claims with data. Time for a refund!
LivinTheDream is offline  
The Following User Says Thank You to LivinTheDream For This Useful Post:
Gonzo (01-29-2019)
Old 09-11-2018, 09:28 AM
  #5  
Flame Red
CF Senior Member
 
Flame Red's Avatar
 
Member Since: May 1999
Location: Windermere FL
Posts: 5,307
Thanked 527 Times in 340 Posts
Default

Got to agree, I installed the DEI and did not notice any difference. Another feel good product.
Flame Red is offline  
The Following User Says Thank You to Flame Red For This Useful Post:
Gonzo (01-29-2019)
Old 01-18-2019, 10:19 PM
  #6  
Gonzo
CF Senior Member
 
Gonzo's Avatar
 
Member Since: Dec 2000
Location: "Atlanta" Ga.
Posts: 7,063
Thanked 146 Times in 111 Posts
Default

I have to say I am disappointed in the results. I expected some benefit ......
Gonzo is offline  
Old 01-19-2019, 02:48 PM
  #7  
ersatz928
CF Senior Member
 
Member Since: Mar 2001
Location: New Jersey
Posts: 1,688
Thanked 262 Times in 201 Posts
Default

You should measure the temperature of the oil cooler, with and without the shield installed. Who cares about the temperature of the Cat?

Last edited by ersatz928; 01-19-2019 at 02:48 PM.
ersatz928 is offline  
The Following User Says Thank You to ersatz928 For This Useful Post:
Gonzo (01-29-2019)
Old 01-21-2019, 09:32 AM
  #8  
BrunoTheMellow
CF Senior Member
 
BrunoTheMellow's Avatar
 
Member Since: Jan 2015
Posts: 2,009
Thanked 319 Times in 252 Posts
Default

Originally Posted by ersatz928 View Post
You should measure the temperature of the oil cooler, with and without the shield installed. Who cares about the temperature of the Cat?
Very true. Just use an IR gun pointed at the bottom of the cooler.

Problem is, the oil and water will keep the cooler at the same temp. Just circulating through the radiator more often.

Only way to truly test is at the track, which I did, and it showed zero tangible improvement. A feel good product. Worth a shot.

Last edited by BrunoTheMellow; 01-21-2019 at 09:33 AM.
BrunoTheMellow is offline  
The Following User Says Thank You to BrunoTheMellow For This Useful Post:
Gonzo (01-29-2019)
Old 01-23-2019, 01:42 PM
  #9  
subieworx
CF Senior Member
 
Member Since: Oct 2016
Posts: 357
Thanked 52 Times in 42 Posts
Default

Originally Posted by ersatz928 View Post
You should measure the temperature of the oil cooler, with and without the shield installed. Who cares about the temperature of the Cat?
If the outside of the cat is cooler everything else around it should be.

In general wraps of this nature are useless. If they had a purposes you would see F1 teams wrapping their exhausts. Instead they use a dimpled metal sheet formed to a clam shell design where necessary. More robust and better at separating hot air from cold.
subieworx is offline  
The Following User Says Thank You to subieworx For This Useful Post:
Gonzo (01-29-2019)
Old 01-23-2019, 09:29 PM
  #10  
badhabit_wb
CF Senior Member
 
Member Since: Sep 2014
Location: in the country North Carolina
Posts: 2,193
Thanked 224 Times in 201 Posts
Default

I have a heat shield for the oil cooler if you're interested. It actually bolts to the cooler. I never installed it because I decided to remove the og cooler and install an external cooler. I agree with you on the converter shield I think the only thing they do is ruin the converters. I haven't used this shield so I can't tell you how well it works but if you're interested in trying it let me know.
badhabit_wb is offline  
The Following User Says Thank You to badhabit_wb For This Useful Post:
Gonzo (01-29-2019)
Old 01-29-2019, 09:37 AM
  #11  
Gonzo
CF Senior Member
 
Gonzo's Avatar
 
Member Since: Dec 2000
Location: "Atlanta" Ga.
Posts: 7,063
Thanked 146 Times in 111 Posts
Default

what does it look like? is it for the specific oil cooler we have??
Gonzo is offline  
Old 01-29-2019, 09:39 AM
  #12  
Gonzo
CF Senior Member
 
Gonzo's Avatar
 
Member Since: Dec 2000
Location: "Atlanta" Ga.
Posts: 7,063
Thanked 146 Times in 111 Posts
Default

Originally Posted by badhabit_wb View Post
I have a heat shield for the oil cooler if you're interested. It actually bolts to the cooler. I never installed it because I decided to remove the og cooler and install an external cooler. I agree with you on the converter shield I think the only thing they do is ruin the converters. I haven't used this shield so I can't tell you how well it works but if you're interested in trying it let me know.
Why would it ruin the cat's ??

Do you think the heat shield for the oil cooler would help, or just prevent heat from radiating off of it??
Gonzo is offline  
Old 01-29-2019, 01:26 PM
  #13  
ersatz928
CF Senior Member
 
Member Since: Mar 2001
Location: New Jersey
Posts: 1,688
Thanked 262 Times in 201 Posts
Default

Originally Posted by subieworx View Post
If the outside of the cat is cooler everything else around it should be.

In general wraps of this nature are useless. If they had a purposes you would see F1 teams wrapping their exhausts. Instead they use a dimpled metal sheet formed to a clam shell design where necessary. More robust and better at separating hot air from cold.
Actually the opposite : Assuming the same heat being input to the cat (from the reaction with the exhaust), if the surface of the cat is cooler, that means it is radiating/transferring MORE heat to its external environment (the air, the oil cooler near it...)
ersatz928 is offline  
Old 01-29-2019, 01:36 PM
  #14  
badhabit_wb
CF Senior Member
 
Member Since: Sep 2014
Location: in the country North Carolina
Posts: 2,193
Thanked 224 Times in 201 Posts
Default

Originally Posted by Gonzo View Post
Why would it ruin the cat's ??

Do you think the heat shield for the oil cooler would help, or just prevent heat from radiating off of it??
I think it may trap too much heat in the converter and cause it to overheat. Several people with wrapped converters have had to have them replaced. The shield for the cooler has an air gap. I think it will keep any heat radiated from the cat from getting to the oil.
badhabit_wb is offline  
Old 01-29-2019, 03:55 PM
  #15  
BrunoTheMellow
CF Senior Member
 
BrunoTheMellow's Avatar
 
Member Since: Jan 2015
Posts: 2,009
Thanked 319 Times in 252 Posts
Default

Originally Posted by badhabit_wb View Post
I think it may trap too much heat in the converter and cause it to overheat. Several people with wrapped converters have had to have them replaced. The shield for the cooler has an air gap. I think it will keep any heat radiated from the cat from getting to the oil.
I haven't had a problem in my 570 rwhp z51 with coolant temps up to 250+ F several times. 100 F ambient.
BrunoTheMellow is offline  
Old 01-29-2019, 06:20 PM
  #16  
badhabit_wb
CF Senior Member
 
Member Since: Sep 2014
Location: in the country North Carolina
Posts: 2,193
Thanked 224 Times in 201 Posts
Default

Originally Posted by BrunoTheMellow View Post
I haven't had a problem in my 570 rwhp z51 with coolant temps up to 250+ F several times. 100 F ambient.
The ones I heard about were z06.
badhabit_wb is offline  
Old 03-13-2019, 09:03 PM
  #17  
Statoot
Junior Member
 
Member Since: Mar 2017
Posts: 9
Thanked 0 Times in 0 Posts
Default

Hello Badhabit, I def would be interested in trying out that heat shield . I cant seem to find them anywhere. Everyone is pushing those DEI wraps, with no real positive results. I think they do more harm than good. Can you send me a pic and a number to cover it and postage @: [email protected]. I have a 14 z51 manual trans. It has an elliptical, not square shaped cooler. I think the square ones came out in 15 or 16.Thanks C
Statoot is offline  
Old 03-14-2019, 05:02 PM
  #18  
badhabit_wb
CF Senior Member
 
Member Since: Sep 2014
Location: in the country North Carolina
Posts: 2,193
Thanked 224 Times in 201 Posts
Default

Originally Posted by Statoot View Post
Hello Badhabit, I def would be interested in trying out that heat shield . I cant seem to find them anywhere. Everyone is pushing those DEI wraps, with no real positive results. I think they do more harm than good. Can you send me a pic and a number to cover it and postage @: [email protected]. I have a 14 z51 manual trans. It has an elliptical, not square shaped cooler. I think the square ones came out in 15 or 16.Thanks C
I emailed you pictures and a quote. Thanks
Herman
badhabit_wb is offline  
 


Thread Tools
Search this Thread
Quick Reply: Testing the effectiveness of a Catalytic Converter shield


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: