Anyone have experience with "Jet Hot Coatings"

I had my rear header coated by Jet Hot. So far it's holding up well & looks good. I went with their std black coating, felt it was less noticable than their silver.

Search the Tech Q&A archives for 'ceramic' and 'exhaust', don't forget to look in the 'Old Fchat'. There are 6 or 8 threads on ceramic coating.

 

I've had several sets of headers coated as well as Porsche Mufflers etc.. Have used the Matte Silver finish, the Sterling, and the black finish all with very good results!

I would reccomend that you go for it!

Paul

 

Had both headers on the 308 coated and after a year of driving, including many track days, they look great! Went with top-line silver-colored coating that brings added life to the headers and also reduces operating temps. The reduced temps part is what i wanted. Looks great, holds up well, and Jet Hot is very well respected and include warranty.

Go for it!

 

Agree 100%. I've had several sets of headers Jet Hotted for my Jaguar XKEs. They look great, hold up extremely well, and do reduce the amount of heat that the headers throw off. I've always done them in black, but I've seen the silver ones and they look great and hold up nicely. They don't turn black and blue like stainless headers do.

 

I used to work for a place called "House of Cobras" in Orange,ca.We sold and assembeled Superformance Cobra repos and We sent all headers out to Jet Hot for coating.Always turned out real nice and was quite durable too.a good product. Tim

 

I have the headers on my off road car coated with the Silver ceramic. The finish is almost indestructable. Pretty much lasts forever.

Darrell.

 

No problems whatsoever, well worth doing.

DM
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I've had every hot side of every turbo that i have owned Jet-hot coated. Its a very nice product



E

 

Hi Fred.

There is a place right off 595 that does the jet hot style coatings. He gave me a price of around 200 for the whole system. Go sr 84 east of University, turn right at Signature Grand the I think the address if 1013 in D bldg. I have the number at work.

I went there to see his work, VERY nice stuff. Plus he displays at the Fri Night gathering at Tower shops, Craig

 

What's the biggest advantage of doing this? Is it just to reduce the under hood temp or does it somehow, thru some act of temperature physics, vent the exhaust better?

 

As i understand it, and there is info about things on their website, is that it lowers temps. Other benefits can include a smoother surface for the air to flow and the coating resists corrosion. The reason i went with it was to reduce temps as at Lime Rock last year in mid-July i felt the oil temp during afternoon sessions at 120C and water at 110C was too high. Ambient was 85F with track at about 110F.

 

I had my headers and muffler caoted. It sure was a lot easier than buffing the muffler.
Photos posted here:
http://www.ferrarichat.com/forum/showthread.php?t=92534&highlight=stebro

 

To be effective from a temperature standpoint, the coating must act like an insulator (low conductivity) and/or a low emissivity surface (reduces radiation from the outside surface to neighboring bodies). Any heat that doesn't go into the engine compartment will have to go somewhere else, namely uncoated bodies like the muffler or cats, with the balance exiting the exhaust system as a hotter gas.

Bill

 

my entire exhaust sytem and turbo are coated with jet hot. keeps the temps down and has held up well. and it looks great as well.

 

The heat has to go someplace, either it is extracted as hot gas out the exhaust (good), emitted into the engine compartment (not so good), or remains in the head (bad). Anyone have any proof of what exactly is happening?

 

Link to Fchat thread.
http://www.ferrarichat.com/forum/showthread.php?t=107453

Scroll halfway down to see the comment by "Harmony..." claiming that jet hot has chipped before and they use Swain Tech
http://www.swaintech.com/

Jet-hot
http://www.jet-hot.com/Pages/coatings.html

No experience with either, but it does look like a way to extend the life of headers that have mild surface rust showing.

 

The ceramic coatings are thermal insulators, so the heat stays inside the manifolds & goes into the muffler.

BTW, it's best to coat everything inside & out. Inside coating reduces the exposure of the header metal to the hot exhaust gasses. Also, the intermediate pipes between the headers & mufflers should be coated, including the 'test pipes' you install for the track.

I had my rear header coated while I had it out last year. The temp between the rear bank & the luggage compartment is now noticably cooler than between the front bank & the firewall. Before I installed the coating the temps were pretty much the same.

Sorry, don't have thermometer data, but the difference is enough so that you can feel it with your hands. Definitely am going to coat the front header as soon as it's convenient.

 

There is a good thread here. http://speedtalk.com/forum/viewtopic.php?t=1050

From another forum I read, just to add fuel to the fire.

[/QUOTE]While concevable, the benifit of keeping the coating on the inside is that the metal is protected from the heat with the internal coating while using only an external coating essentially turns the header into a self cooking oven by allowing the heat to penetrate the metal and then not disipate away because the ceramic is insulating the heat in. The result is the header metal now is subjected to more heat than no coating at all.[/QUOTE]

Actually, the carbon that forms inside of a typical exhaust part is a far greater thermal insulator than the coatings you're talking about, so I'd say the opposite would be true. The coating resists the adherance of the carbon within the pipe, eventually allowing chunks/sheets of carbon to sheet off and possible foul turbochargers, catalytic converters, etc.

[/QUOTE]Some people have gone so far as to ceramic coat the internal and external surfaces of the tubine and compressor as well as the impeller/wheel. I believe one porsche owner on this sit actually did this in the last year or two.[/QUOTE]

Many of the turbine engines I've built have ceramic coatings on the turbine blades, nozzles, flameholders, etc. However, these coatings are NOTHING like the coatings that the applicators doing those turbocharger jobs are doing. The turbine engine coatings are applied at the factory under very closely controlled conditions, and are not something of the water based spray-on/cure in your oven type of products we see advertised online and in magazines. In fact, these aerospace coatings are fused into the parent material, something you're not going to find in the coatings that guys like us can purchase.

[/QUOTE]The key to not having that failure would be to make damn sure the guy or company who is doing your coating's knows what he is doing, and is using a product designed for the level of heat, pressure, vibration that it's being applied in.[/QUOTE]

I'll agree with this. I had a talk with the guy who holds the ONLY FAA approval for exhaust system coating on the phone yesterday, and he mentioned a lot of what's discussed here. He said that coating the inside of exhaust headers, etc. was a waste of time and money. He said that most places that claim that they coat inside and out. . . . don't. He said to consider the cost of what they offer. . . . . if they say they'll do the outside for $300 a pair and the inside for just $50 more. . . you've got to be suspicious. There'll be a lot more work involved in in preparing the inside than the outside, so why would they charge less than 20% more to do more than twice the work?

 

They can't really coat the insides... The powder coater that ceramic coated mine wouldn't even consider quoting doing the insides. His process wouldn't work on the inside of the pipes. He did a REALLY nice job on the outsides.

I posted a few photos in this other thread:
http://www.ferrarichat.com/forum/showthread.php?t=110790&page=2

 

Interesting thread on speedtalk. I've observed very rapid deterioration of piston crown and skirt coatings done by a a major player in the business and haven't used the coatings since.

A lot of the new engines run so lean they really don't make much soot to coat the insides of the pipes with.

I'm not in the business of coating headers pipes but to me it seems it wouldn't such a trick to fill the whole header up with ceramic slurry and then let it run out to coat the inside. It's an an age old process in the ceramics business and a lot simpler than spraying the outside of a set of intertwining primary pipes.

I wouldn't bet the farm on what some aircraft people say. A lot of us have real awe for them but I've met some real hacks in that business which is really scary.

Wil