exhaust / header wrap, Pro / Con |
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exhaust / header wrap, Pro / Con |
drive-ability |
Jul 3 2006, 11:46 PM
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#1
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Senior Member Group: Members Posts: 1,169 Joined: 18-March 05 From: Orange County, California Member No.: 3,782 |
I was thinking of ways to lower engine noise and maybe heat in the engine bay.
Opinions on the header / exhaust wrap? |
alpha434 |
Jul 4 2006, 12:14 AM
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#2
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My member number is no coincidence. Group: Members Posts: 3,154 Joined: 16-December 05 From: Denver, CO Member No.: 5,280 Region Association: Rocky Mountains |
(IMG:http://www.drury.edu/nltimage/sh.jpg)
DO IT!!!!! No, seriously. It may not quite things down a whole lot, but for just a little work, you can reduce your engine bay temps. |
Mueller |
Jul 4 2006, 01:13 AM
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#3
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914 Freak! Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
for a V8 watercooled car like yours, not too bad of an idea, it will lessen the lifespan of your headers...ceramic coating works for the heat, but it costs more...
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elocke |
Jul 4 2006, 07:15 AM
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#4
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Member Group: Members Posts: 178 Joined: 9-February 03 From: Georgetown, MA Member No.: 272 |
It reduced my engine bay temps significantly. I've already got ceramic coated headers so I just did the pipes back to the muffler. But it got rusty under the wrap.
Ed |
SLITS |
Jul 4 2006, 07:44 AM
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#5
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
The only con to the wrap is that due to the increased heat in the metal, it will crystallize and have a tendency to crack over an unspecified period of time.
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JPB |
Jul 4 2006, 09:39 AM
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#6
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The Crimson Rocket smiles in your general direction. Group: Members Posts: 2,927 Joined: 12-November 05 From: Tapmahamock, Va. Member No.: 5,107 |
I'd ceramic them first then wrapp. The ceramic will keep the pipes rust free and won't crack from the heat since it will be protected from the coating. Ceramic headers for a v8 should only be 200$ or so and thats inside and out.
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Brett W |
Jul 4 2006, 11:51 AM
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#7
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Advanced Member Group: Members Posts: 2,858 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None |
Get stainless headers and you won't have to ever worry about rust or wrap. Stainless is better than coated anything.
But if your budget isn't as big you can wrap steel pipes. They will start to corrode quickly though. I ran my stock heat exchanger pipes wrapped and after two years of daily driving they started flaking big chunks of steel off. |
drive-ability |
Jul 4 2006, 03:45 PM
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#8
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Senior Member Group: Members Posts: 1,169 Joined: 18-March 05 From: Orange County, California Member No.: 3,782 |
I found a good article on header/exhaust warp, basically they said it will dust your headers what ever they are made of. Here is a sample of what happens to a set of headers over time. I think I will pass on the warping of the exhaust for now.
Try these actual test numbers: Mild Steel (1010) uncoated header exposed to 1200º F. in normal air will have a weight loss percentage of roughly 25% with only 10 hours use at this temperature. Stainless Steel (410) uncoated header will have roughly 8% weight loss in the same 10 hour period. A coated mild steel header will have NO weight loss at temperatures up to 1200º F. In fact it will actually gain a bit of weight! Between 1300º F. and 1600º F. the coating will begin to show signs of mud cracking or like the look of lacquer checking. However, limited diffusion takes place between the coating and the substrate, producing a very thin film of iron aluminide, which continues to inhibit oxidation |
lmcchesney |
Jul 4 2006, 03:51 PM
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#9
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Member Group: Members Posts: 488 Joined: 24-November 03 From: Ocala, Fl. Member No.: 1,381 Region Association: None |
Header wraping has had a bad (w)rap. Sorry, I could not resist.
Instead, I wrapped my intake tubes to reduce their temp. Larry |
Andyrew |
Jul 4 2006, 04:34 PM
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#10
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California |
Header wraping has had a bad (w)rap. Sorry, I could not resist. Instead, I wrapped my intake tubes to reduce their temp. Larry Cant really wrap the intake tubes on a sbc... (IMG:style_emoticons/default/biggrin.gif) Im considering doing it for my car... We'll see I guess. |
lmcchesney |
Jul 4 2006, 04:36 PM
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#11
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Member Group: Members Posts: 488 Joined: 24-November 03 From: Ocala, Fl. Member No.: 1,381 Region Association: None |
Sorry.
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Joe Bob |
Jul 4 2006, 05:59 PM
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#12
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
RUST....you need more of it? Wrap yer headers....
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turboman808 |
Jul 4 2006, 06:22 PM
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#13
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Advanced Member Group: Members Posts: 2,718 Joined: 31-January 06 From: North Jersey Member No.: 5,505 Region Association: North East States |
Cars both ceramic coated and header wraped.
Now I did this on my civic and it worked wonders. The most important thing I found out though is this. If you use the silicon spray to spray the pipes before and after you wrap them they don't seem to rust. You can clearly see where I missed spraying the downtube on my car. That spot is rusted a bit nothing else is. |
PRS914-6 |
Jul 4 2006, 08:24 PM
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#14
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Excellence Magazine Project 914 3.6 Group: Retired Members Posts: 1,278 Joined: 20-May 06 From: Central California Member No.: 6,031 Region Association: None |
While there are performance gains to be had, there are as many down sides. Most header companies will not warranty a set of headers that have been wrapped. They just get too hot. Drive any vehicle up a hill at night, jump out and look at the exhaust manifold and it will be glowing red. Imagine what will happen with thin tubes and wrap. Don't do it.
This is from Doug Thorely Headers: Why does header wrap void the warranty? Let’s pose this question: “Is it wise to put on a coat, in the desert, in the middle of summer?” With headers, it’s always summertime. You can imagine the effect the wrap has on the headers; it holds in heat and literally cooks the headers. |
drive-ability |
Jul 4 2006, 09:49 PM
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#15
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Senior Member Group: Members Posts: 1,169 Joined: 18-March 05 From: Orange County, California Member No.: 3,782 |
Turns out I have Renegades ceramic headers anyway and after reading some more wright-up's its just better not to use the wrap on the system. I am going to close in my engine bay lid vents and vent the air out of the trunk area. Don't know where exactly as yet. Having a V8 (no air pumping air cooled engine) the exhaust/engine heat is drawn into the cab. If I move the vents back it will then be drawn off away from the cab. I can insulate the engine bay lid and use electric fan to vent the hot air out further back. This will stop the hot air from entering the cab and cut down on engine noise.
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