I noticed some headers that are wrapped with some kind of material ....

what is that for ??
why do you wrap the headers ?

 

heat wrap stuff keeps heat from getting away from the header into the bay 'im not sure how well it works

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ace$nyper &raquo;</TD></TR><TR><TD CLASS="quote">heat wrap stuff keeps heat from getting away from the header into the bay 'im not sure how well it works </TD></TR></TABLE>

ya but dont you want to eliminate heat from the engine/headers ??

 

well i'm really qutie drunk at this time but if i can think strait enough to make some logic header wants heat on it but the motor stays cooler and the heat doesn't leak off to hit your intake rad and all that stuff keeps the heat in the header it self and then out the exhaust

If i was sober i'd give you the correct and or better explained rearson

 

from an emissions point of view, keeping the headers hot and not letting the heat leak, makes your catalytic converter operate better, most cats operate between 900-1600 degrees F. And it also keeps most of the heat from heating the engine bay, about the same purpose as that metal plate that is on stock exhaust manifolds. as for keeping the heat out of the engine, thats what an EGR does. It recirculates exhaust gases and lowers combustion chamber temperatures. hope that helps.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrmechanic &raquo;</TD></TR><TR><TD CLASS="quote">from an emissions point of view, keeping the headers hot and not letting the heat leak, makes your catalytic converter operate better, most cats operate between 900-1600 degrees F. And it also keeps most of the heat from heating the engine bay, about the same purpose as that metal plate that is on stock exhaust manifolds. as for keeping the heat out of the engine, thats what an EGR does. It recirculates exhaust gases and lowers combustion chamber temperatures. hope that helps. </TD></TR></TABLE>

good enough'

but to cover now the downsides
by concentrating the heat into the metal of the headers, it causes more stress into the welds, and or material wich can bring some cracks with time......

 

Get the header coated instead...

 

No matter what you do you will not be aable to eliminate heat from the header. Being they get so hot thats why they make insulation for them so you dont make everything else under the hood extra hot. I've heard they make your header rust quicker though.

 

I have A DC Sports ceramic coated 4-2-1 header.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rob. &raquo;</TD></TR><TR><TD CLASS="quote">I have A DC Sports ceramic coated 4-2-1 header.</TD></TR></TABLE>

Me too. The wrap is designed to insulate the outside from the heat that the header radiates. The downside is that a lot of people believe the ceramic coated headers will crack if they have no way to dissipate their heat.

"header wrap is bad mmkay" --- https://honda-tech.com/zerothread?id=454373

Read what Buzzbomb said --- https://honda-tech.com/zerothread?id=821070

 

hotter exhaust makes it flow better and faster, thats why the turbo guys do it. wrapping it keeps that heat in the exhaust.

 

for all of those who say it cracks i wanna see some pics of some cracked exhausts. ive only seen one and he didnt even wrap his.

 

Keep the wrap about a 3/4 of an inch from the welds.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaKPX &raquo;</TD></TR><TR><TD CLASS="quote">for all of those who say it cracks i wanna see some pics of some cracked exhausts. ive only seen one and he didnt even wrap his.</TD></TR></TABLE>

it cracks the inside of the header so it would be hard to see. but if your running stainless steel header it shouldnt rust. a mild steel header that isnt coated basically no one sell a header that is mild steel and not coated. unless its some custom header. the ceramic coating of the header does exactly wut u want wiht the header tape make the ehaust gases stay inside increase velocity and not increase engine bay temp. to be on the safe side people get it coated by places like jet hot swain hpc coaiting.s

 

what is this Jet coating?
do you buy it like in a can and you spray it yoursefl?
how does this work?

 

you have to send it to the shop they coat the inside and outside its rated for hella heat. made so that the heat doesnt escape that muchprotects against rust. its slippery some people use it inside of guns makes. makes the velocity faster cuz the inside is htoter while it makes engine temps lower because it doesnt make the header escape heat. they go for around 100 buck or so.

 

How will header wrap the affect o2 sensor readings?
o2 sensor is seeing more heat.
How does the ecu react?



Modified by eda6 hb at 9:42 PM 7/21/2004

 

Heres your CRACK.... well rewelded hole that is. You can also see where the 2 primaries broke and had to be rewelded....


And heres some rust from the wrap too...


Would post more of it but threw away the old header.....

 

ill test this out. ill clean up my jdm dc 4-1 ss hdr then wrap it. record engine bay temps @ the track before and after, and possibly dyno runs?!? im interested unless there is some data available already...pics, the whole shabang

 

I used 2" DEI header wrap on my 1990 Honda Civic Si. Exhaust wraps main use is to reduce the engine bay temperature by keeping the heat in the exhaust, They claim about a 50% drop in temperature which is very close to being correct from my experience. Keeping the heat in the exhaust system also increases the velocity of the exhaust coming out of the tailpipe. I can drive my car all day long, Touch the header and not get burned. As far as the header cracking from wrapping it, You cannot overlap the header wrap more than a 1/4" over itself or you will cause hot spots which will cause cracking. Everyone that I spoke to that cracked a header had wrapped it incorrectly. For no reason on any part of the header should you overlap the header wrap more than a 1/4". If you run into an area where you have the choice either to overlap the header wrap more than a 1/4" or leave a small area uncovered, It is best to leave that small area uncovered. I have had my header wrap on for over 2 years with no problems, only benefits. Hope this helps!

 

Mine cracked dc 4-2-1 after about 2 years with the wrap. It wasnt anything major and I weld so it wasnt really any issue. Really helps with smog

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zad5 &raquo;</TD></TR><TR><TD CLASS="quote">to be on the safe side people get it coated by places like jet hot swain hpc coaiting.s</TD></TR></TABLE>

I had mine done by HP Coatings - looks great, and no worries about rusting (again), and hopefully, gave a teensy bit of hp, too. It's a much better-looking alternative to wraps. And I have seen premature rusting from using wraps, too. Traps condensation. Well, you could go stainless, I guess; I just think that coating 'em looks so much better, for that add'l bling bling.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hahagasdcrx &raquo;</TD></TR><TR><TD CLASS="quote">Heres your CRACK.... well rewelded hole that is. You can also see where the 2 primaries broke and had to be rewelded....


And heres some rust from the wrap too...


Would post more of it but threw away the old header..... </TD></TR></TABLE>

thanks for your help

 

I had my turbo manifold coated by Jet-Hot. It cost about $120 including shipping my manifold to them and back. It looks really good. They use a silver coating which is very shiny almost like chrome. It seems to me that it works very well. Im not running a heat shield and it still seems to put out less heat than the old manifold with a heat shield. I highly recommend the coating.