Welcome to the North American Subaru Impreza Owners Club Friday September 19, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Custom Fabrication, Welding & Tools

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-11-2012, 06:50 PM   #1
Crazy_pilot
Scooby Newbie
 
Member#: 164242
Join Date: Nov 2007
Chapter/Region: E. Canada
Location: Toronto
Vehicle:
1992 SVX
2008 Spec B

Default Custom Exhaust Heat Shield

The exhaust on the SVX has two cats in the primary pipes that basically sit in the transmission tunnel. The heat off of these tends to make the footwell area fairly toasty after a bit of driving, so I'd like to build some heat shields to cut down on the radiant heat transfer.

The problem spot (There's now a 6-speed where that auto used to be):



My concept:



Is there an ideal stand-off distance between the shield and the exhaust? I had it set at 3/8 when I drew that up. Also, I originally picked stainless as the best material for this, but what about aluminium? This isn't a tuned turbo car so the temps never get that extreme. I'd also add some heat reflective tape to the inside of the shield.

And for anyone who might ask why not just use wrap, I just like fabricating things. This is more fun.
* Registered users of the site do not see these ads.
Crazy_pilot is offline   Reply With Quote
Old 10-30-2012, 02:49 PM   #2
401sti
Scooby Newbie
 
Member#: 321326
Join Date: May 2012
Chapter/Region: NESIC
Location: ri
Vehicle:
04 sti
silver

Default

nice looking design! im not an expert but from what i have read on heat tape an inch of air space is best. i have also read that the cats should never be wrapped, even though yours isnt turbo the cats still get hot and you never want to over heat a cat.
imo: factory heatshields have less then 3/8 of space between so i think you will be fine
401sti is offline   Reply With Quote
Old 10-31-2012, 10:38 PM   #3
speedyHAM
Scooby Specialist
 
Member#: 48377
Join Date: Nov 2003
Chapter/Region: MWSOC
Location: "They eat fish soaked in lye"
Vehicle:
1996 Gutted, built
XP class Impreza L

Default

I would put at least 1/2" of space between the cat and the shield. If you are closer than that stainless steel would be best, at 1/2" you should be able to use 0.020" aluminum without any problems. Closer and I'd worry about the heat affecting the strength enough to crack the mounts on the heat shield.

That CAD work does look nice.
speedyHAM is offline   Reply With Quote
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 Off
Forum Jump


All times are GMT -4. The time now is 10:31 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.