Rusty Bowtie
General Category => Early Chevy/GM Discussion => Topic started by: madmike3435 on September 26, 2017, 01:48:36 AM
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that header wrap woven stuff, has anybody used it.
I believe its supposed to keep the heat inside allowing the surface to be cooler. A friend with side pipes installed found that the metal on the pipes got real hot on the exposed area causing the side covers to get hotter and the body to also get hotter. Anybody have any experience with this stuff.
I have seen it on lots of motor cycles exhaust.
mike lynch
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that header wrap woven stuff, has anybody used it.
I believe its supposed to keep the heat inside allowing the surface to be cooler. A friend with side pipes installed found that the metal on the pipes got real hot on the exposed area causing the side covers to get hotter and the body to also get hotter. Anybody have any experience with this stuff.
I have seen it on lots of motor cycles exhaust.
mike lynch
Read this....https://www.centuryperformance.com/exhaust-header-heat-wraps-do-not-use.html (https://www.centuryperformance.com/exhaust-header-heat-wraps-do-not-use.html)
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I wrapped the tube headers on the 270 GMC in my pickup to get rid of some under the hood heat. I ran it for several years before switching to cast headers. I didn't wrap them because I had heard how bad it is. I had no problems and the truck ran a lot better with the tube headers. I'll put them back on the next engine but I'll probably have them coated.
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The only thing I've heard bad about the wrap was getting it wet or salted. Needs to be changed often like a bandage.
Maybe make some shields with 2 u-bolts and some steel sheet with holes for ventilation
(like X's) .
I passed inspections with some of the sidepipes from jc Whitney and never burned a leg, they stayed cool to the touch.
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Used the wrap a couple times. Had bad luck both times. It creates enough heat to deteriorate the ceramic coating over time and then the rust sets in. Might have been poor coating. Headers were from Sanderson and Hooker. I noticed the rust on the outside of the wrap so I pulled it off and found the tubes almost rusted thru.
Plus I think it looks like crap to begin with and most people use it as a band aid. After a while looks even worse
Wouldn't use it on my bath tube pipes............. Ron
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I've used it, but only where heat burn next to a component is needed protected. Personally don't like the look of heat wrap though. Never used it to increase performance so I can't answer to that. That article seems to have a lot of half truths in my opinion. I would personally like to see the effects of a new set of headers after 500 miles @8-9k rpm with header wrap vs bare, (same tubing, same header) I highly doubt that all that holds it together after the race is the wrap. Only 10hrs use on bare header loses 25% metal, Christ how did I make it to California and back ;D Just my observations and curiosity, i'm no engineer nor have I ran tests on the matter.
I've seen new Hooker headers rust out in a year at the collecter(painted), yet a cheap set of Blackjacks last 15yrs. A friend had a set of Headmans on his 69 Chevelle sbc for 3-4 years before swaping out for a 396. They where "wrapped" , surprisingly clean when the wrap came off. He lightly hand sanded and repainted, sold them at swap meet.
No doubt ceramic coated works for a long time and is expensive. Wrap is cooler to the touch however.
Mike what are these sidepipes and what are they on? Like Rattiac said, the JC Whittney/ (Speedway/Rocket etc)type screen cover works good. Hooker Show tubes on the old Vettes and Camaros would burn the hyde of your legs in an instant! Usually happened to the girlfriend in shorts.
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I believe the guy who was offering the 50 ft of the stuff , had it on his 65 corvette SBC 365 hp- with factory side pipes.
He really felt the heat with the wrap on and also the sills got really hot also. He used a thermometer gun to record the temps, before removing it, the wrap.
I liked what the reviewer had to say in the posted link, MOOSIE posted
mike 8)
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I believe the guy who was offering the 50 ft of the stuff , had it on his 65 corvette SBC 365 hp- with factory side pipes.
He really felt the heat with the wrap on and also the sills got really hot also. He used a thermometer gun to record the temps, before removing it, the wrap.
I liked what the reviewer had to say in the posted link, MOOSIE posted
mike 8)
Mike his application would increase muffler temps. He probably started the wrap just below the exhaust manifold to the last turnout to muffler? All that heat held in the wrapped area is not being disipated by the time it hits the muffler, now being disipated starting there. All the older Vettes were notorious for under hood/floor heat. If he was trying to keep the heat out of the pass compartment, a heat shield under the floor pan (I know C3s had them) and more insulation under the carpet are your best bet. (And there still hot) Dad had a 65 same equipped and a 66 same except standard exhaust. The 65 might have been a tad cooler on the floor pan. I cant remember if they were a fiberglass cover, I know my '69 had factory sidepipes and had fiberglass side covers, never got that hot to burn or touch.
Repeat, I do not like the looks even if wrap works. Every situation, cars are different to your needs. It does have its place.
The first time I read that article(?) 10+ years ago, I took it as just an advertisement for Jet Hot Coatings. You know, buy our product because it's better than anything out there. ;D I've seen it reposted (minus some, plus some added by individual posters and figures have a to very ;))
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Army hummers have these shields. The X metal stuff.
https://goo.gl/images/wL28jU