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Heat shielding for intake and exhaust?

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Number21
Posts: 2
Joined: May 15th, 2018, 2:21 am
Stroker Displacement: 4.0L
Vehicle Year: 1998
Vehicle Make: Jeep
Vehicle Model: Cherokee

Heat shielding for intake and exhaust?

Post by Number21 » May 15th, 2018, 2:37 am

I don't have a stroker, but, if I ask a performance question on a normal Jeep forum they tend to freak out...

I have a 1998 4.0 Cherokee, and I want to replace the exhaust system entirely. I plan on using a header (undecided on brand) with a custom 2.5" front pipe, high flow cat, muffler, 2.5" tailpipe, etc. Have to get rid of that god awful factory downpipe.

Since I've got to take off the intake to install the header, I might as well upgrade to the '99+ style intake manifold, bored TB, and a new set of the 4 hole injectors. (190,000 miles I'm sure my old injectors aren't working at 100%) Yeah, I know, not going to be 1,000hp, but it should breathe much better.

I'd really love to insulate both the exhaust and the intake to reduce both intake and underhood temperatures. For the header, I would like to wrap it with header insulation. I don't want to send the manifolds away anywhere to be ceramic coated.

First, I'm wondering if this product from Eastwood would be good for coating the inside of a header in addition to an external wrap?
https://www.eastwood.com/eastwood-hi-te ... ozzle.html

With that in mind, would it make sense to use the same coating on the inside of the intake manifold? Also, if I coat the outside of the intake manifold with a ceramic coating, would it make sense to only coat the bottom half, or do the entire thing?

Russ Pottenger
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I love JeepStrokers.com!!
Posts: 639
Joined: August 15th, 2009, 1:27 am
Stroker Displacement: 4.7
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Heat shielding for intake and exhaust?

Post by Russ Pottenger » May 15th, 2018, 7:32 am

Haven't had any experience with the Eastwood product, but seems too gimmicky to me. Don't see how I could properly be done much less hold up over a period of time.
Since you haven't bought your header yet I would purchase one that is coated both on the inside and outside.

Do Not use a wrap on your header. It retains moisture and eventually your header will rust and fall apart.

Using a heat barrier tape or product on the underside of the intake couldn't hurt, but I would resist put anything inside the Plenum or Runners of your Intake manifold.

Number21
Posts: 2
Joined: May 15th, 2018, 2:21 am
Stroker Displacement: 4.0L
Vehicle Year: 1998
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Heat shielding for intake and exhaust?

Post by Number21 » May 15th, 2018, 5:35 pm

Russ Pottenger wrote:
May 15th, 2018, 7:32 am
Haven't had any experience with the Eastwood product, but seems too gimmicky to me. Don't see how I could properly be done much less hold up over a period of time.
Since you haven't bought your header yet I would purchase one that is coated both on the inside and outside.
I'm not sure how the product is different than high temp ceramic paint, but probably not a lot, maybe thicker. In my experience the high temp paint usually holds up quite well, and even a thin layer of paint provides better thermal insulation than bare metal. Eastwood products tend to be pretty good quality, and it does have a bunch of 5 star reviews. I definitely wouldn't use it on a used header, but something brand new shouldn't have any adhesion problems.

Ceramic coated headers tend to be MUCH more expensive, and I'm not putting a $500 header on a 20 year old Jeep. I'm looking at several stainless headers under $200.
Russ Pottenger wrote:
May 15th, 2018, 7:32 am
Do Not use a wrap on your header. It retains moisture and eventually your header will rust and fall apart.
I really don't think that would be a problem on a stainless header, especially in the south where salted roads do not exist. I would put a layer of ceramic paint on the header first, every little bit helps, and, they even make high temp paint that is designed to go on top of header wrap to seal it. Header tape is going to have a much higher insulating value than even a professionally coated ceramic header could provide.

6sense
Posts: 5
Joined: August 3rd, 2018, 4:50 am
Stroker Displacement: 4.0
Vehicle Year: 1999
Vehicle Make: Jeep
Vehicle Model: Grand cher

Re: Heat shielding for intake and exhaust?

Post by 6sense » August 7th, 2018, 2:16 pm

Number21 wrote:
May 15th, 2018, 2:37 am
I don't have a stroker, but, if I ask a performance question on a normal Jeep forum they tend to freak out...

I have a 1998 4.0 Cherokee, and I want to replace the exhaust system entirely. I plan on using a header (undecided on brand) with a custom 2.5" front pipe, high flow cat, muffler, 2.5" tailpipe, etc. Have to get rid of that god awful factory downpipe.

Since I've got to take off the intake to install the header, I might as well upgrade to the '99+ style intake manifold, bored TB, and a new set of the 4 hole injectors. (190,000 miles I'm sure my old injectors aren't working at 100%) Yeah, I know, not going to be 1,000hp, but it should breathe much better.

I'd really love to insulate both the exhaust and the intake to reduce both intake and underhood temperatures. For the header, I would like to wrap it with header insulation. I don't want to send the manifolds away anywhere to be ceramic coated.

First, I'm wondering if this product from Eastwood would be good for coating the inside of a header in addition to an external wrap? I’m useing this Eastwood product I don’t know how well it really works because I have no other reference.I will tell you it sprays like water direction say shake it around then pore out the extra.I used it on my banks torque tube.Like I said I have no reference.My Jeep Grand Cherokee has a m90 supercharger so I’m trying to keep things cooler
https://www.eastwood.com/eastwood-hi-te ... ozzle.html

With that in mind, would it make sense to use the same coating on the inside of the intake manifold? Also, if I coat the outside of the intake manifold with a ceramic coating, would it make sense to only coat the bottom half, or do the entire thing?

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Cheromaniac
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Re: Heat shielding for intake and exhaust?

Post by Cheromaniac » August 8th, 2018, 1:29 am

1992 XJ 4.6 Stroker - 5MT - 202rwhp/258rwtq - Sold 13/12/2016 :cry:
Stroker build-up, Stroker "recipes"
2006 Mustang 4.6 GT - 5MT
- 310rwhp/328rwtq - Midlife crisis car :D
A few bolt-ons

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