Thread: Heat, Exhaust, Shield, Tape, Exbox, Hot

I ordered some "stuff", most of it arrived today.
Results and temperature shots to come.

Originally Posted by jon3950

I spent a little time to tonight lying under the Defender and contemplating the world and all things heat and exboxes. At the risk of stating the bleeding obvious, here are my thoughts. The problem as I see it is the shape of the transmission tunnel. It's basically a big square box at the end that traps all the heat from the transmission and exhaust. The back of this box is the back of the seat box which blocks any airflow in this area. The top of this box is where the exbox sits. Putting heat shield on the bottom of the exbox will help, but a lot of heat is being absorbed by the back of the seat box. This can then be conducted up to the exbox and because it is sealed it then acts as an oven. The first thing I need to do is wrap the exhaust between the flange and the muffler. I only wrapped up to the flange because I was only thinking about my feet (selfish, I know). Once it gets to the muffler it is behind the seat box so should be ok as its all out in the airstream. Not sure what to do next. The most effective solution would probably be self-adhesive heat shielding stuck to the underside of the transmission tunnel and seat box, so there's no dead airspace behind the shielding. This would be a very complicated job and I don't really like the idea of it sitting under there gathering mud. Maybe just a bit on the back of the seat box might help. Another option would be to shield the seatbox and transmission inside the cabin. This might work but the exbox would have to be insulated from the seatbox - ie no metal to metal contact. I've been eyeing off the Exmoor stuff - a lot of money, but if it does the job it would be worth it. They say the on their website it doesn't fit the 2.2 so need to find out about that. Anyway, some food for thought. I'll wrap the rest of the exhaust up to the muffler on the weekend and see how that goes. I also need to get a more comfortable driveway. I can see I'll be lying on it a lot now. Cheers, Jon

A good option would be a coating of some sort, one of our members is doing a restore and has used Raptor lining for some of his panels (not for heat reduction) if the Raptor lining reduced or reflected heat this would be a good option as it can be rolled on.
Another roll on option would be a ceramic coating I know they use these already in/on mechanical parts and in my line of work (commercial/industrial floors) I will ask my suppliers for some tech data on a roll on ceramic, then there would not be the problem of mud etc sticking under there. You might still have to back it up with some heat protection inside the cab under the Exbox.

I'll make a phone call and get back to you all.

Sent from my iPhone using Forum Runner

I did a few things today with the exbox install on a 2015 defender.

First of all, I dynamat both the inside and outside of the exbox.
(Theres probably better stuff for heat shield but this should help).

Outside


Inside (You may notice that I raised the electrics another 25mm using some 25mm alu tubing - The sires look too cramped below the fusebox)


Now to work on the exhaust.
This is the problem


and from below


I bought this heat shield stuff from Carbuilders. (prompt delivery can recommend - I bought other stuff too, thats for another thread) Sound Deadener - Car Builders - Sound Deadener Heat Insulation Car heat Shields
I hat to cut a little bit out, so it would go over that bit of metal welded to the pipe, you can see it the picture above. (Yes I used the bottle opener on the scissors)



Heres what it looks like installed

Ive just spent about $1700 on Dynamat, Dynaliner, Car builders heat sheild and hood liner etc.
I picked my Defender up in Albury today and will start lining it top to bottom next week when I drive back to Cairns.
I'll put some photos up here as well, but will follow closely what you have done around the exhaust. My seat box is almost too hot to keep your hand on.
That being said, the 110 is no where as loud as I was expecting (and Im ex military, so know Perentie very well.
Best wishes all.
Ken

I've got an Exbox in my 90 that houses the usual electrics from under the seat and all the Redarc gear.The latter being the main concern as the Exbox got so hot you could hardly touch it on a long drive.I bought some Heatshield Products from the States.I got the exhaust wrap,Muffler heatshield and another heat reflective,self adhesive product you cut to size for under the Exbox.This was aPITA as you have to undo the Exbox and lift it up as much as possible to fit,so it'd be wise to do it before installation.Temperate is cut down a fair bit, probably not as much as I'd like,although to touch it the change is noticeable.

Karlz
Thanks for the photos and ideas
That heat shield looks a good option.
Are you happy with the hose clamp attachment or is it a little chincy ?
With the clearance seen I can see me tigging a few tabs onto the zorst and installing a stainless shield.

I love your idea of spacing the electrical system off the heat sink

S

Originally Posted by roverrescue

Karlz
Are you happy with the hose clamp attachment or is it a little chincy ?
...
I love your idea of spacing the electrical system off the heat sink

S

The clamp is stainless, its pretty tight. Ive hidden the tabs up, I dont think they will be the 1st contact point. Theres plenty of something else under the defender to get trapped 1st.

I think the product is good, all the bits are stainless except for the shield itself.
But there is something in between the alu of the shield, i.e. its not just a piece of Alu Its sort of sticky. I dont know what it is.

I also bought from Carbuilders a big piece of this shielding. That will go above the muffler, havent worked out the mounting mechanism yet.

Thanks for the ideas,
I have already wrapped the exhaust to the first flange, awesome result.
Thinking, this, Zero Clearance is a premium quality peel and stick heat shield material, under body engine bay heat , would be great in the transmission tunnel, & under ex-box, probably when i pull the transfer case to put the good Ashcroft bits in. Has anyone done this ?

And i might as well do the rear seat area in sound deadener, sound dampening, noise insulation, dynamat, resomat, underbody, sound proofing

Again, thanks for the link