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Exhuast manifold option for desert use.

3blackbirds

NAXJA Forum User
Location
Hummelstown, Pa.
Hello all,


I'm building up my father's '01 XJ with a 4" lift and a bunch of maintenance items and upgrades. He's moving from central PA to New Mexico within the year. His, like my '99, has the heat soak issue. He's a light wheeler with 250k on original motor. It's a DD. I don't think he'll do a stroker when this motor quits, but he will put in rebuilt one if it does.



I'd like to know if I should leave the stock cast iron manifolds bare, ceramic coat them or swap out for a ceramic coated header like JBA or AFE.


Thanks in advance.
 
Are you try to fix something? The biggest question I would have is it Fed or Cali Emissions ?
 
Are you try to fix something? The biggest question I would have is it Fed or Cali Emissions ?

I thought all the 01's got the Cali emissions package with the pre-cats? I know mine has them.

I'd add a fan timer to run the efan after shutoff if heat soak is an issue. I've got the parts sitting in my garage to do it sooner or later.
 
I'm not trying to fix anything, just keep the heat soak from happening or greatly reduce it. It has the pre-cats after after the manifolds. I already have a switch installed on his to turn the fan on manually. I plan on adding an aux fan timer and wrapping the injectors with the DEI kit. I have both on mine. I know ceramic coating helps keep the temps down under the hood. Wasn't sure if you south-westerners prefer the cast iron manifolds or aftermarket headers to manage the heat in the engine bay.
 
Well I would definitely do the DEI kit, I have it on both my 2k's. Plus I also just installed a SS feed line.
P1080615_zpsxhifpl4l.jpg
 
I have been dealing with the hot soak issue for 15 years in my 2001 XJ.
Three things have had positive effect.
Insulating the injectors and fuel rail, as mentioned by RCP Phx, using he DEI kit.

Adding a three minute fan timer, for use in hot weather.
When used, I never experience a hot soak problem.
https://www.flickr.com/photos/lwade/sets/72157617434915718/
And insulating the bottom of the intake manifold.

39870476132_cf248e9bc1.jpg
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Hood vents didn't seem to make much a difference and caused problems with water getting into the TPS, requiring drip trays to be fabricated.
The fan timer is the the only absolute, hot weather cure, in XJs with the twin mini-cats.
 
I have been dealing with the hot soak issue for 15 years in my 2001 XJ.
Three things have had positive effect.
Insulating the injectors and fuel rail, as mentioned by RCP Phx, using he DEI kit.

And insulating the bottom of the intake manifold.

What is the product you used for the bottom of the intake manifold? How has it held up over time?
 
What is the product you used for the bottom of the intake manifold? How has it held up over time?

I used this.
https://www.amazon.com/gp/product/B...arch_asin_title?ie=UTF8&psc=1#customerReviews
No idea of how it will hold up over the long run, the engine was installed a little over year ago, so far, so good.

Previously, I used a Thermo Tec sound and heat barrier, glued to the bottom of the intake manifold. It seemed to help a lot in keeping the intake air cooler and in reducing the heat soak problem..
It was in use for about five years before the engine came out for the stroker and the insulation was still in decent shape, with some peeling around the edges.
https://www.thermotec.com/products/...rs/suppressor-acoustical-and-heat-control-mat
On the old style intake, a piece of aluminum sheet metal can be fitted as a heat shield.
https://gojeep.willyshotrod.com/HowtoIntakeShield.htm
 
Lazyxj, I remember those pics from when I was installing my timer a few years ago. The one pics greatly helped for the termination points on the jumper. Thanks for posting those.


I didn't think to insulate the intake manifold. I'll do that. How much material did you use? I'll have the stock exhaust manifolds ceramic coated too since I can have that done locally for under $200.



Thanks for the replies so far.
 
On the old style intake, a piece of aluminum sheet metal can be fitted as a heat shield.
https://gojeep.willyshotrod.com/HowtoIntakeShield.htm

I'm working on a 96 at the moment so this may be my best option -- thinking I'll also incorporate some sort of fuel line heat shield also

I do remember reading guys using some sort of aluminum baking pans for replacement heat shield over the cat/muffler -- have to see if I can find them - might be a good candidate for this too
 
I didn't think to insulate the intake manifold. I'll do that. How much material did you use?

I used the whole 24" x 24" piece, as linked to above.
 
Heavyopp;246641766- thinking I'll also incorporate some sort of fuel line heat shield also I do remember reading guys using some sort of aluminum baking pans for replacement heat shield over the cat/muffler --[/QUOTE said:
Dual layer insulated baking sheets.
https://www.amazon.com/Masterclass-Non-stick-Layered-35x28cm-Sleeved/dp/B0001IX3L4
https://www.bedbathandbeyond.com/st...-sheet/5290800?keyword=insulated-baking-sheet

They come various sizes and can be found locally at BB&B and other household goods stores, as well as online.
 
I was checking it out today — I just re-installed the intake and exhaust manifolds a few days ago — still have the air box and power steering pump uninstalled — the fuel line is also still loose

I cut a piece of cardboard roughly to the right size/shape just to see if I could get it in there without bending — looks to fit easy enough

I’ll end up making the heat shield with 1/8th aluminum plate and I’ll also weld up something to help shield the fuel line that runs under there too — the 1/8th plate should be stiff enough to not rattle but remain light enough to only need mounting at the 2 bolts for the fuel line bracket
 
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