#BulletSolano 

overall temperature is only one component of thermal conductivity. its measured in watts of power transmitted by an area. you can put whatever you want on those headers, even the high tech black ceramic heat tiles from the space shuttle, they will still heat up to the same temperature as the exhaust. but they wont transmit the heat outwards into the air or the body of the car. source - engineer and car guy Here is a good real world example... if you leave a piece of steel and wood outside in the sun, they will both heat up to the same temperature. but if you pick up the steel it will burn the piss out of you, and the wood will just feel hot to the touch. the steel conducts heat to your hand much faster. thats what you are trying to prevent

I appreciate the time you took to experiment and make this video 👍

I didnt know a sewing machine could get so hot..

The header is hotter because you've kept the heat localized onto the header where it is more beneficial for exhaust velocity and decreasing engine bay heat spread. On the stock heat shield, temperatures on the shield are lower because the heat is being dispersed into the bay with a larger surface. Not keeping it localized on the header. Just a bit misinforming in the video.

When you coat a header to control heat you're reducing the exhaust tubes ability to radiate heat. What that means is it would be more scientific to mount a piece of metal near the headers and then take temperature reading from it before and after. There are a few products that you can apply inside the tube as well. In a northern climate this isn't that important but if you regularly see temperatures in the triple digits it can really make a lot of difference. Taking a temp reading on the tube won't properly show the difference in heat transmission. It's also important to know that there are header wraps that can be painted. In a case like that I paint the header, wrap it and then paint the wrap. This helps protect the wrap and also locks it in place. If you plan to paint the wrap then only overlap it by 1/4 inch. Bullet you can make an custom aluminum heat shield for your header that mimics the stock manifold shield as well and really lower your temps.

the hotter the header the better that means the temp is staying inside, measure the temp of something near it like the engine mount or the alternator

Taking reading with infared temp gun on a reflective surface like aluminium gives inaccurate readings, I would stick tape/non reflective material to the metal

You dont need to wet the titanium header wrap. Do you know why you wrap your headers? The reason is because when you wrap the header, you keep the heat in, making it really hot. The higher temps will increase exhaust gas velocity....that's why you are supposed to wrap your headers.

Honda Stock is Best. It was built that way for a reason. I am studying Head and Exhaust temps for my Honda Motorcycle Build. Great Video. Been working on Honda Accords since 1994. Cheers!

The whole point is to make the pipe retain the heat and have exhaust gases exit quicker... Which it's doing exactly that.

It seems like the wrap holds more heat, without the wrap it lets the heat out in to the engine bay. Would be cool to have ambient temp sensors in there for more data. Good video

You just saved me!! I have classic Chevy " starter heat soak". 350FI starts great cold. Just barely turns the flywheel, even with hi torque gear starter. Thought I would wrap header and pipe near starter to keep it cool. Bad idea. Now I will fabricate starter heat shield and separate header/pipe heat shields. My application is emergency rescue equipment. Performance is not important, BUT reliable start/restart is life dependent! Thanks

Nice simple video, thanks for taking the time to do it

You should NOT take a measure at the first day of wrapping (i have wrapped my exhaust too) because the material is still wet You have 2 options 1) drive and everybody will horn to you ''hey something is burning in your engine'' due to the smoke that will produced from inside your hood 2) do it in your backyard when your car is idlying but this will take much more time and effort. Nevertheless YOU MUST let the wrapping dry before taking any measures with your thermometer otherwise you get faults results.

i loved the part where you left out a header bolt

Nice video.. Clearly shows that if you intend to daily drive your car in traffic or the likes and want other components in your engine bay to have a longer life..stick with the stock exhaust manifold and heat shield.. as engineered by the manufacturer and forget the headers... The hotter the surface the more heat it radiates.. The best would be headers that come with a heat shield built around them.. But that is asking too much from the header companies.. Lol

This is very helpful. I wonder if you can paint the stock heat shield with some high temp paint to further cool the engine bay... does any have any suggestions for heat shield paint?

Good information Thanks for your time and efforts

The wrap is supposed to make it lower in the temp. That stuff is no good then. Glad you did this test. Wonder what’s out there that will help lower the surface temp of the exhaust

Laser temperature will ALWAYS give false readings on reflective coatings, chrome , aluminum silver paint, ect. I suspect heatshield would be hotter than 150ish after 20mins.. 🤣🤣🤣

Hot headers make more power, hot air flows faster but u don’t want that heat in your engine obviously

Very educational video man. Thank you a lot.

It's counter productive putting the wrap..I live in Chicago so my pipes are below temp...cooled faster without the wrap

the heat your reading is on the header wrap and headers, not the engine compartment, the header wrap stores all the heat inside of it increasing its internal heat, this also aides in the exhaust function, hence manifolds are thick iron, with a shield on the top elbow where the highest heat shall concentrate there and it being closest to the cylinder. what would be great is sensors inside the engine compartment near plastic while driving, and thermal checking with your laser meter all other objects underhood, they ideally should be cooler. Ceramic coating the headers is best way to go, regardless if you wrap. although my 302 torino 1973 loved wrapped headers.

wow this is a informative comparison, thank you sir.

I had a 2002 Maxima that I put a custom turbo kit on it and had the manifolds and downpipes jethot ceramic coated. The engine bay was SMOKING HOT!!! So I bought some Heatshield inferno exhaust wrap and wrapped all the manifolds and downpipes and WOW!!!!! HUGE MASSIVE difference in engine bay temps dropped dramatically!!!! Wrap is WAY WAY better than ceramic coating. Ceramic coating only looks prettier Thats it!

Thanks for the video. I was wondering what the wraps did, looks like they dissipate heat.

With heat shield it will spread heat into your entire engine bay. Without heat shield same too and with wrap less heat into the bay so that mean your intake suck cooler air = more hp

Considering that HEAT will eventually KILL things in your engine compartment, I think it's a horrible idea to add the wrap, it only made the engine compartment hotter. MORE HEAT = LESS HORSEPOWER. On a 4 cylinder NA engine, headers add negligible horsepower anyway and now you add headers which run hotter than your factory manifold and heatshield and to me it sounds like your actually LOSING HORSEPOWER! Anyone else think the same way?

The exhaust pipes themselves WILL be hotter because the heat is being contained inside so it doesn't bake everything else around it. If it's +100 degrees that means there's that much less radiating into the surrounding engine bay.

Did you not know that that wrapping them increases the temperature of the pipes ? Lol wrap is not meant to cool down the headers it stops heat from radiating into your engine bay ....

More plz. Lol good video

I know it's not scientific but I wonder how warm it feels to put your hand near the exhaust for comparison. There isn't more heat applied since it is the same source so maybe the IR thermometer isn't telling the whole story. Heat wrap looks good.

The optical temperature readers depend on the surface emissivity, so black coated will typically read higher temperatures.

Look up the aerodynamics around the windscreen…. Those ‘hood risers’ only work at VERY low speeds.

I would have thought the wrapped pipes would be notably cooler. Interestingly they were not.

Good video man!

But your engine bay temps will be less with the wrap. Less radiant heat. You are just measuring surface temp. Also hotter gasses flow better

Try touching the raw headers vs wrapped, the wrapped headers can be touched, much cooler engine bay temps.

A more accurate temp would be ambient.

Cool video bro. 👍

The reason why it was super hot in the beginning it was because the wrap needs to burn and get attached to the headers. You should’ve tried it after couple days after trying it

thanks for the video. seems to me the conclusion is more about how temperature is measured and limitations of an IR thermometer. Maybe another way to measure the heat would be to put a remote oven thermometer in the engine compartment, close the hood, and track the air temperature. Doing a before and after, and making sure the outside air temp and sun conditions are similar would give good info. You could also add in a 15 minute run down the expressway on cruise control.

Do you experience any different in performance after wrapping?

Those led strips on the headlights are so cool! Did you do that custom?

What about jet hot coating them?

great work!!!

Sorry, but that's not a true comparison .. Put a heat shield over headers and you'll get a lower temp reading from the shield as heat has already been lost ...That's why the bolt reads hotter because it is connected to the manifold itself..Heat shields are there to protect you and the manifold will be a lot hotter underneath Put a heat shield over the headers and you will get a lower reading on the head shield again like the first reading you took The gun you are using too is not accurate on reflective surfaces either.... Ceramic coatings are well proven to reduce total engine bay temperatures by an average of 25 degrees or so ..Heat wrap done with good quality can reduce surface temp by 30 degrees or more too ..I know, it had made a HUGE difference to my Hot Rod and spark plug caps

Sorry. Useless video. You're missing the science behind heat wrapping. It's to reduce conductive heat transfer. And increase exhaust gas speed , and more.

Lol you got the same broken bolt on your headers as I do lmfao

Something is wrong to me. Water boils at 212 degrees so if your working on your car and sweat drop on that heat shield it boils away so how does your thermo only read in the hundreds?

How about testing a diy ceramic coating and test the temperature?

Good video just a bit of advice I know it's kind of old, something that would've been good is to measure the surrounding components for heat soak.

Good review

Very useful video!

good to know tho I didn't know it would change alot

I'm wondering what the temp of the stock headers is without that shield. My 01 Accord 2.3L has the stock headers but the shield is rotten and falling apart so I'm curious if there's any harm done from heat if I just ran without it

the exhaust system dissipates heat, NO THE SHIELD IS NOT DOING ITS JOB ITS ONLY A SHIELD, the aftermarket headers are STAINLESS STEEL and do not dissipate heat as well as steel, THE WRAP INSULATES IT AND IT WILL BUILD HEAT

You didn't calibrate your temp gun for the different emissivity of black paint vs fabric. Your readings are completely invalid as a result. That's the problem with the cheaper guns.

Did you wrap it right side around?

That's that alibaba heat wrap sauce lol

u need to wrap those again😂 tf

Temp guns like you have won’t give you the correct temp, the shine of the rap throws the temperature gun off I know i use to work at a place that we had to check temperatures on shiny objects, I will tell you this you can lay your hand on the exhaust wrap that header you won’t without the wrap

Damn your better off keeping shit stock 4real tho lmao to much heat in my opinion

so your checking it with the heat shield on? ok thats not valid test, looks like your motor is glowing red hot something wrong with it bro

Well factory don't have header. They have exhaust manifold.

Cannot understand a word you saying man. Glad to see your doing good on YT.

I want to see dyno befor and after

They say That header wrap is bad due to the wrap trapping the heat and causing the welds to fail. Take note brothers, to each is own tho. Just trying to spread the word. Looks can be deceiving.

imagine that at full bore, at full speed

Those damn headers glow when you run it hard. Headers only begin to work at 6000 rpm according to conventional wisdom.

wow that's why race teams just use aluminium plates as a heat shield

Are those wraps available in the U.S. ?

Header wraps are designed to keep the heat in the header to improve the scavenging of the cylinders. Keeping the heat in the header allows the exhaust speed to remain high. (the right idea) Header wraps, by keeping the heat in the header, also reduces the radiant heat in the engine bay. There are no header manufacturers that I know of who will warranty their headers if header wrap has been installed on their products. This includes partial installations of the header tape on certain tubes or sections. In most cases, the header wrap damages the headers beyond repair. (I will explain below) If you run a lean mixture, you "may" see a slim performance gain using header wraps. A rich mixture may show slim to absolutely NO gain in performance. If replacing your headers and header gaskets regularly does not bother your wallet or your time, and you like that ugly look of a wrapped header, go ahead and use the heat wrap. So put the stock exhaust manifold on that car and drive it like a small economy car that it is. It's not a Porsche, Lambo or Ferrari. But I do appreciate the time you took to make this video. Good stuff man.

looks like to missed a bolt on the right

Did you wet the header wrap when you installed it?

Those guns work on reading the reflective light back from a laser (not the red indicator light). The figure changes because ur “laser” is being absorbed and thereby effecting the results.

Just paint it with 2000 high heat

Wrap them

Dude. I don’t need a temp reader. I can run my car hard for 3 hrs on my wrapped header. (Not headerS) ... and I can rest my hand on them. Now Do that on a stock heat shield.. or no wrap header. Have 911 on speed dial

I thought this was a rap video 😁

Removed the cover the original exhaust 😠👍

It's not stock headers its exhaust manifold

How long did it took till you heared a big BANG and found out this is totally useless? :D

Fully warmes up after 20 minutes? Ur cars oil donst get above 80 degrees before 30 minutes😂

That's a shity wrap job bro!!

Mal metodo de medicion !!!!

Made it worst lol.

The wraps are meant to keep the headers cool....

to much measurement failures! touchless are depending on the colours!! Black will create a different value than white! So your work was useless, sry