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Old 03-29-2005, 12:26 AM   #1
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Thoughts on Exhaust Header Wrap?

What do you guys think about using some high-temp exhaust header wrap on the downpipe/exhaust section that is exposed in the engine bay? I've heard claims of nearly 50% decrease in radiant heat in the engine bay, which makes me all tingly. On the other hand, I am a little concerned about keeping all that heat in the exhaust in such a high concentration (don't want to warp or crack any expensive parts)...
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Old 03-29-2005, 03:43 AM   #2
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i just wrapped mine like 5 days ago... man the smell is terrible the wrap is still in its first stages.
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Old 03-29-2005, 03:46 AM   #3
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I just did mine last night......pretty thick stuff, make sure you get the metal tie wrapps to keep the beginning and end of the wrap nice and tight.....

"tingly?" :P :P
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Old 03-29-2005, 05:23 AM   #4
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I had my downpipe wrapped for like a year. I kept the engine bay a lot warmer. I had it wrapped from the turbo back the the flex pipe.
I took it off cause i hear a good point.
If you wrap a pipe and its not stainless and it gets in contact with water. That water is going to stay on the wrap. Making the water stay on the pipe which will make it rust. After i took mine off, the whole pipe was rusted where i put the wrap onto.

Its a good product, but keep it out of pipes that would see rain or wet.
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Old 03-29-2005, 05:29 AM   #5
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Great for race cars or garage beauty queens. Nasty for daily drivers - I've seen handfuls of manifolds that were cracked, warped, or rusted through from this stuff, and I've never seen one that had it on for any length of time and wasn't damaged.
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Old 03-29-2005, 06:59 AM   #6
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i assume stainless dp wont b damaged by it bud
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Old 03-29-2005, 07:15 AM   #7
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You're right, bud - as far as rust damage is concerned.

How many TSL members have stainless manifolds though?
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Old 03-29-2005, 08:15 AM   #8
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im taking abou tthe downpipe and i think the initial poster was also talking about the downpipe my manifold is ceramic coated
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Old 03-29-2005, 08:23 AM   #9
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Quote:
Originally Posted by ricot83
im taking abou tthe downpipe and i think the initial poster was also talking about the downpipe my manifold is ceramic coated

I think why he mentioned the manifold is that the problem you can encounter is hotter gas in the piping leading to air not moving as fast and raising EGT's all the way back to the Turbo and thus cracking the manifold from excessive heat.
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Old 03-29-2005, 05:17 PM   #10
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Wouldn't hotter gas = more energy = higher velocity ?
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Old 03-29-2005, 05:21 PM   #11
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precisely jabm
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Old 03-29-2005, 06:03 PM   #12
 
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Quote:
Originally Posted by JABM
Wouldn't hotter gas = more energy = higher velocity ?
Uh oh....Adrian is going to appear and deliver a sermon on fluid dynamics of gases in 4......3......2.......1.....





But....Most aftermarket downpipes are stainless for at least the first half to resist cracking. I'm looking into a heat wrap or some kind of shield because my intake pipe is about three inches away from the dp.....

The problem with wrapping a manifold is that you can't wrap it evenly, so it can't expand evenly. Cast iron is pretty tolerant of temperature extremes but it has its limits. You'd be better off coating the manifold and evenly wrapping the downpipe with Thermo-Tec or some similar product....
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Old 03-29-2005, 09:49 PM   #13
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Quote:
Originally Posted by ricot83
precisely jabm
Are we sure about that??? We need an engineer here!!
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Old 03-30-2005, 04:12 AM   #14
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Quote:
Originally Posted by mike saunders
You'd be better off coating the manifold and evenly wrapping the downpipe with Thermo-Tec or some similar product....
And/or just building a heat sheild that won't touch or interfere with any exhaust or intake manifold parts!

I've seen too many aftermarket headers/manifolds that were crap, and far too many stock pieces that were ruined by DIY projects, I suppose it's left me jaded.
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Old 03-30-2005, 06:16 AM   #15
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Quote:
Originally Posted by mike saunders
Uh oh....Adrian is going to appear and deliver a sermon on fluid dynamics of gases in 4......3......2.......1.....
I was looking for his post...
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