Heat!

Jeff B

Well-known member
Ok, let’s discuss heat. My daughter and I drove the D90 to North Carolina Outer Banks this afternoon.
Ambient air temp was 90-92 .
The first hour was ok but by the second hour the seat box had absorbed enough heat that we were roasting.
Its a ‘97 ST and engine temp the entire 6 hour trip was 186-190F.
No, I don’t have AC.
I have a RN Badger softop.

I do have the Exmoor seatbox- floor- tunnel mat.

At about hour 4, I took the temp of the seatbox with IR gun and it was 129F.....

I have put some heat shielding underneath....


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Tbaumer

Technical Excellence Contributor
Ouch. I am looking at getting the Exmoor floor - tunnel mat, hoping it's still available without the seat box section, so it will help quiet the noise & keep my floor from cooking my feet. 129F - that's some heat to be sitting on! Is there an exhaust pipe shield to direct the heat down? The exhaust pipe seems to be the main source of the heat on mine.
 

Angus

Well-known member
Just a suggestion, but you could put header wrap (Summit Racing) around the exhaust pipe under the floor/seat box to prevent heat transfer...
 

1of40

Well-known member
Welcome to summer Defender bonding. That sounds pretty normal. Sealing up the seat box lids helps a little bit but the key is to keep the heat from getting to the metal. Insulating on the inside is ok for cold but not ideal for heat that transfers and radiates.
 

Uncle Douglas

Well-known member
Callsign: delete
Ouch. I am looking at getting the Exmoor floor - tunnel mat, hoping it's still available without the seat box section, so it will help quiet the noise & keep my floor from cooking my feet. 129F - that's some heat to be sitting on! Is there an exhaust pipe shield to direct the heat down? The exhaust pipe seems to be the main source of the heat on mine.
your diesel wont make that heat. Its the cats on a V8 that create these temps.
I think the magnaflow and NRP cats flow better and dont make the crazy heat that the stock ypipe makes
 

Jeff B

Well-known member
I think the magnaflow and NRP cats flow better and dont make the crazy heat that the stock ypipe makes
Oh, and I’m running stock y-pipe with NRP behind that.
I even wrapped the NRP muffler and used some of the reflective stuff on the bottom of the floor.

I think a standoff heat shield would probably help...

Maybe I can fan up one out of Aluminum.


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Jeff B

Well-known member
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Uncle Douglas

Well-known member
Callsign: delete
It would be interesting to see how hot your atf is getting in that environment. After having a gauge on the atf in the powerstroke its was a real eye opener how it spiked after running 70 to pull up to a traffic light. It would shoot up 50 degrees in the period of a single traffic stop.
Got to be ugly in the beach traffic crawl getting up to Corolla.
 

jymmiejamz

Founding Member
Callsign: KN4JHI
It would be interesting to see how hot your atf is getting in that environment. After having a gauge on the atf in the powerstroke its was a real eye opener how it spiked after running 70 to pull up to a traffic light. It would shoot up 50 degrees in the period of a single traffic stop.
Got to be ugly in the beach traffic crawl getting up to Corolla.

I may be wrong, but I think that is due to the torque converter. As I understand they generate a lot of heat.
 

Napalm00

Technical Excellence Contributor
The local club here in California has been over this extensively.

Most guys are using perforated aluminum heat shield available on Amazon with a standoff from the body. this creates reflective air gap that seems to be effective in rejecting most of the heat. Others are running wrapped exhaust header but you can't wrap it around the cats.

adding internal rubber mats is not going to solve this problem as it eventually just heat soak through these mats. we've come to conclusion here across a bunch different trucks that heat rejection is the number one way to reduce this baking effect inside of V8 trucks. Diesels don't get nearly as hot but some guys have done the same air gapped insulation and or header wrap with nearly instantaneous impact.
 

RBBailey

NAS-ROW Addict
Callsign: KF7KFZ
I have a solid heat shield hovering over the top of the pipe as it runs under the floor/seat box. I think the air gap between shield and pipe and seat box is important. I think it works well, but I wouldn't know the difference since I put it on as I put the truck back together.
 

Jeff B

Well-known member
The local club here in California has been over this extensively.

Most guys are using perforated aluminum heat shield available on Amazon with a standoff from the body. this creates reflective air gap that seems to be effective in rejecting most of the heat. Others are running wrapped exhaust header but you can't wrap it around the cats.

Yeah, that sounds interesting.
On Amazon? Any links? I’ll try and search....

The rubber Exmoor seatbox/floor/tunnel cover helps insulate sound but once the heat soaks in it is just as hot as the floor..
 

Napalm00

Technical Excellence Contributor

Jeff B

Well-known member

this stuff so so way cheaper just to buy it at the junkyard because on most full size trucks and vans it's down there in 8 ft long sections
Hey now...... local junkyard... now there’s an idea.

Maybe a big ‘Murican full size heat shield cut down a bit...


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Uncle Douglas

Well-known member
Callsign: delete
I may be wrong, but I think that is due to the torque converter. As I understand they generate a lot of heat.
yep anytime an auto trans torque converter isnt locked up ie top gear its generating heat. In the case of the big diesel pickups,
they run cool until air stops flowing over the cooler.
The power steering cooler on a powerstroke pickup is larger than a 97 NAS 90 trans cooler- wondering how effective the rover trans cooler is.
 
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redcoat22

New member

this stuff so so way cheaper just to buy it at the junkyard because on most full size trucks and vans it's down there in 8 ft long sections

Does anyone here have any experience with putting something like this on the underside of the seat box? I might give this a whirl along with lining the battery box with Dynaliner.

Thoughts?
 

Jeff B

Well-known member
Does anyone know some good trucks to scavenge some heat shields from? I might try my local pick-n-pull if I have a few models to source ...


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rocky

NAS-ROW Addict
If there are generic cats that fit, see if they are also used on more generic vehicles aka cheaper...that had heat shields.
 
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