Reduce Underhood Temps- Exhaust Wrap - Page 2 - JeepForum.com

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post #16 of 30 Old 11-21-2010, 03:02 PM
TXjeepTJ
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What if you prepped it extremely well, put on a few coats of high temp. rust proof paint - then wrapped it?

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post #17 of 30 Old 11-24-2010, 06:17 AM
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I'm wondering about this as well. I wrapped the pipes on my bike and got an extra kit to do my brand new Edelbrock Header that I'm installing. I've been putting off the installation, because I'm not 100% sure if I should wrap it or not. I was worried how nasty it would get with me wheeling. I'd use High Temp header paint to prep it, wrap it, and then seal it with the silicone spray that comes with the kit. Anyone do this and not have their header rot out in 2 years and how does it hold up to washing it? Not pressure washing with extreme force, but just some engine degreaser and the hose once every couple of months.
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post #18 of 30 Old 11-26-2010, 03:05 PM
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ive knowticed none of the hightemp paint really holds up. Ive even done the bake on high temp and used our oven at work after about a month the paint came off. i think the only option is to get ceramic coating, but that in it self acts like a heat retainer.

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post #19 of 30 Old 01-03-2011, 12:16 AM
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Quote:
Originally Posted by josh9465 View Post
the stainless steel that rusts. made in china i suppose.
Perhaps it was sever corrosion due to oxidation, and not rust?

Yeah...chinese metal sounds like a more likely explanation ha.
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post #20 of 30 Old 01-05-2011, 07:33 PM
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Originally Posted by tehgregzor View Post
Perhaps it was sever corrosion due to oxidation, and not rust?

Yeah...chinese metal sounds like a more likely explanation ha.
Oxidation is rust.

Stainless steel can and does oxidize or rust, it is far more resistant then carbon steel, and was probably a poor grade of stainless.
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post #21 of 30 Old 03-22-2011, 05:06 AM
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I wrapped a set of headers back in the late 80's. Tehy did rust quite severly. They did reduce the underhood heat, a lot. In that car a 75 Bricklin, it was way worse than a jeep. Stick your head in an over for comparision. I then had the headers Jet Coated. It reduced the heat almost as much as the header wrap. They still look new. Although I haven't driven the vehicle much. Headers get hot, so I don't see why or how a bit more heat would crack them.
There are two types of Stainless, 300 series and 400 series. One if magnentic (the cheaper one), and the other non-magnetic. I think they use the magnetic one in headers, as it is easier to bend. And yes, I have seen SS rust. It was a revolver that was in a flooded basement.
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post #22 of 30 Old 06-10-2011, 06:06 AM
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The wrap made by COOL IT sold at NAPA has a high heat coating spray that you put on over the wrap to protect against moisture, abrasion and keeps the wrap from deteriorating. The guys that had their pipes rust probably didn't use this spray right? Just a thought.
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post #23 of 30 Old 06-10-2011, 10:51 AM
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Originally Posted by richardshd View Post
The wrap made by COOL IT sold at NAPA has a high heat coating spray that you put on over the wrap to protect against moisture, abrasion and keeps the wrap from deteriorating. The guys that had their pipes rust probably didn't use this spray right? Just a thought.
Wrong. I coated mine with that. I painted the header before wrapping. And after wrapping. Maybe I didn't coat it enoguh, but I doubt that. I haven't had much if any probelms with JET coat or the Armour coat on the Pace Setter headers.
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post #24 of 30 Old 10-28-2011, 02:24 PM
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There are 2 kinds of stainless steel ferrous and non ferrous. Ferrous is more likely to rust but will not rust out under normal conditions. All stainless will rust when covered. So the wrap prevents oxygen from getting to the stainless causing it to rust.

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post #25 of 30 Old 11-10-2011, 06:39 AM
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There are 2 kinds of stainless steel ferrous and non ferrous. Ferrous is more likely to rust but will not rust out under normal conditions. All stainless will rust when covered. So the wrap prevents oxygen from getting to the stainless causing it to rust.
Uh, no. All steels are ferrous, ie iron based. That defines steel.
http://en.wikipedia.org/wiki/Stainless_steel
The alloying of stainless steels give different types. Oxygen causes rust, ie Iron-oxide. The problem with the wrap is that it traps moistier (water) next to the steel. It prevents it from evaporating. This accelorates the corrostion process know as rust.
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post #26 of 30 Old 12-26-2011, 10:20 AM
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That's why it isn't called stainfree. StainLESS. I've seen 316 SST flash rust plenty of times. It all depends on what you're using it for.
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post #27 of 30 Old 02-21-2012, 06:34 PM
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I know this is an old tech article but I think I can shed some light on the moisture issues being experienced by some.

There is a silicone spray the OP mentioned in his write-up, this is a coating that creates a waterproof seal after wrapping headers. Make sure header wrap is completely dry with a heat gun. Also, I wouldn't worry about having the rattle can ceramic paint baked, it will bake the first time you use it.
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post #28 of 30 Old 03-19-2012, 05:10 PM
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jet hot coatings hehehe
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post #29 of 30 Old 03-27-2012, 12:00 PM
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Originally Posted by 100kclub
jet hot coatings hehehe
X2. Excellent product!!
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post #30 of 30 Old 05-08-2012, 12:50 PM
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Quote:
Originally Posted by Idwheelthat
I know this is an old tech article but I think I can shed some light on the moisture issues being experienced by some.

There is a silicone spray the OP mentioned in his write-up, this is a coating that creates a waterproof seal after wrapping headers. Make sure header wrap is completely dry with a heat gun. Also, I wouldn't worry about having the rattle can ceramic paint baked, it will bake the first time you use it.
Most header companies put a warning on wraping them, it causes them to deteriorate at a faster pace because they get so hot without being able to have air flowing around them, make sure you are wrapping the ones calling for it not all... Just what I learned...

Keep on Keep'in on

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