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trunk exhaust heat shielding (cut trunk, 4.9 swap) suggestions needed by jokerb90
Started on: 05-30-2010 03:48 PM
Replies: 9
Last post by: josef644 on 06-06-2010 10:23 PM
jokerb90
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Report this Post05-30-2010 03:48 PM Click Here to See the Profile for jokerb90Send a Private Message to jokerb90Direct Link to This Post
So my cat and muffler live where the deep part of my trunk used to be, with the cat about 3 inches from where the new "floor" will be.

Questions -- how hot is this going to get before I build the floor? Decklid melting or just warm?

What have you used for heat sheilding?

Thanks?
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jokerb90
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Report this Post05-31-2010 12:35 AM Click Here to See the Profile for jokerb90Send a Private Message to jokerb90Direct Link to This Post
I need to drive the car for about a 20 minute drive with the trunk cut and am wondering if I will need to stop and let it cool....

anyone?
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cptsnoopy
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Report this Post05-31-2010 01:48 AM Click Here to See the Profile for cptsnoopySend a Private Message to cptsnoopyDirect Link to This Post
I am guessing of course but I think you will be ok. If the trunk is still open on the bottom you should have enough air moving around to keep from melting the deck-lid.

Try driving it around for 5 to 10 minutes and see how the bottom surface of the deck-lid feels.

Charlie

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josef644
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Report this Post05-31-2010 09:17 AM Click Here to See the Profile for josef644Send a Private Message to josef644Direct Link to This Post
MAke you a card board floorboard shelf, then transfer it to a piece of plywood or metal. This is my plan. I have seen a car Archie built, and it had the factory trunk fabric over the installed shelf.
mine:
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couldahadaV8
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Report this Post05-31-2010 10:33 AM Click Here to See the Profile for couldahadaV8Click Here to visit couldahadaV8's HomePageSend a Private Message to couldahadaV8Direct Link to This Post
As long as you are driving you should be fine. When you stop you should open the trunk lid right away so the heat rising can get out.

I have my exhaust system from my V8 running where the lowest part of the trunk was. I welded in a new trunk floor about 1" above the mufflers/pipes. I sealed it completely around the edges. My plan is to add 1-2" of fibreglass insulation on top of the new metal floor, and then a sealed plywood trunk floor on top of that.

Rick

[This message has been edited by couldahadaV8 (edited 05-31-2010).]

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jokerb90
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Report this Post05-31-2010 10:57 AM Click Here to See the Profile for jokerb90Send a Private Message to jokerb90Direct Link to This Post
Everyone, thanks for the info, I'll try to get her home on thursday. Actually got to use the car as part of my degree at the local college -- man that lift was nice. Now that she is running I just want to bring her home. Will post pics when complete.
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Arns85GT
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Report this Post05-31-2010 12:10 PM Click Here to See the Profile for Arns85GTSend a Private Message to Arns85GTDirect Link to This Post
If you know an HVAC tech, or a furnace/AC installer, they have foil backed white fiber insulation good for about 2000*.

I've used it behind my forward heat shield and it works perfectly. They usually have left over pieces after doing a major job and it is normally free.

Hope this helps

Arn
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Francis T
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Report this Post06-01-2010 03:30 PM Click Here to See the Profile for Francis TClick Here to visit Francis T's HomePageSend a Private Message to Francis TDirect Link to This Post
If you use self-stick alluminiumized heat shield like those that Summit and Jeg sells, add a bunch of pop rivits to make sure it stays put.

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jokerb90
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Report this Post06-06-2010 06:55 PM Click Here to See the Profile for jokerb90Send a Private Message to jokerb90Direct Link to This Post
well, made it home fine, with a sheet of 16? gauge metal. Stopped twice (okay thrice) on the way just to make sure everything was okay. The metal got too hot to touch, so earlier today I did some homebrew heat shield work. I am nearing completion, and on a shoestring budget (aren't we all...) so please realize I had to work with what I had. On with the pics!

Here is what I started with today:

This is the two parts of shield I had left over, and the trunk "floor"

First I used some bolts to create standoffs for some air gap

Installed part one

installed part two -- aren't self tapping screws great!

Slapped a piece of alumnium angle for rearward floor support

Floor test:

Quite possibly the best use I've come up with for header wrap


Did it work? Well, I let her idle for twenty minutes with everything closed. Opened the decklid and could easily put my hand on it, 'twas warm, but not hot at all. I then drove around too see if it changed, and as I expected it only got cooler. I no longer fear reinstalling my carpet, should look good when done.

Was twenty minutes long enough -- well, it was for me. I won't let my car idle for that long (except for this test), your results may vary. How do you think I did? I wonder what other forum members think -- any suggestions for improvement?

Well, hopefully this will help someone else, and enjoy that swap, this one's a hoot to drive now.
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josef644
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Report this Post06-06-2010 10:23 PM Click Here to See the Profile for josef644Send a Private Message to josef644Direct Link to This Post
I like the way you did this. This was my plan too.
Joe
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