Quoted from Techline's website:

The pigments determine the actual lubricating potential. PTFE, as an example, is listed as having the lowest coefficient of friction (COE). However, under high speed and load, the COE of PTFE degrades while that of MOS2 (Moly) improves, until it is significantly better than PTFE. Selecting the proper ingredients can make or break a coating.

From what I understand, under high load PTFE (or 'teflon') can separate from the surface to which it is applied. If that is correct, I'm not sure you want it to be loose in your oil system.

 

i dont think trace amounts of teflon in the oil system would be all that bad of a thing...i mean it might just help out the bearings. i use coatings on the dirt bike pistons when we rebuild those, however i didnt think it would be worth 6% hp. thats a ton, would love to see some dyno sheets on that. when i rebuild my motor i will for sure be spraying my own coatings, i mean its pretty easy and almost free power.

 

moly is in all the good synthetic engine oils.

 

Some notes on polytetrafluoroethylene gleaned from the web:

- From Ryan Plastics website
P.T.F.E is the most popular of the fluropolymers. P.T.F.E suffers high elastic deformity under load which reduces it's effectiveness for bearing applications.
http://www.ryanplastics.co.uk/htmlpa...ials/ptfe.html

- From Dupont's website
Heat resistance: Teflon® industrial coatings can operate continuously at temperatures up to 260°C/500°F and can be used for intermittent service up to 316°C/600°F with adequate ventilation.
http://www.dupont.com/teflon/coating...roperties.html

PTFE simply does not have the thermal or load-bearing properties to warrant use as a friction-reducer in an automotive environment. It is, however, highly resistant to chemical degradation. This may make it suitable for items such as valve seals, provided it does not encounter heat or loads which will cause it to breakdown.

- From Mindfully.org
In new tests conducted by a university food safety professor, a generic non-stick frying pan preheated on a conventional, electric stovetop burner reached 736°F in three minutes and 20 seconds, with temperatures still rising when the tests were terminated. A Teflon pan reached 721°F in just five minutes under the same test conditions (See Figure 1), as measured by a commercially available infrared thermometer. DuPont studies show that the Teflon offgases toxic particulates at 446°F. At 680°F Teflon pans release at least six toxic gases, including two carcinogens, two global pollutants, and MFA, a chemical lethal to humans at low doses. At temperatures that DuPont scientists claim are reached on stovetop drip pans (1000°F), non-stick coatings break down to a chemical warfare agent known as PFIB, and a chemical analog of the WWII nerve gas phosgene.

For the past fifty years DuPont has claimed that their Teflon coatings do not emit hazardous chemicals through normal use. In a recent press release, DuPont wrote that "significant decomposition of the coating will occur only when temperatures exceed about 660 degrees F (340 degrees C). These temperatures alone are well above the normal cooking range."

Okay, I know that cookware and automotive engines are not the same thing. The point is that PTFE's decompose at temperatures well below which they might encounter in an engine. The thermally-decomposed products (gases and particulate) of PTFE have been found to have effects ranging from moderate irritation to fatal in very small doses. Particularly, these products have been linked to liver cancer (all PTFE is carcinogenic) and acute lung injury.

 

You say that it is easy to do? I had thought about that, but then quickly forgot about it since it is internal engine parts and I dont want to F them up, but explain how easy easy is and it could save me some money, I found one site that I could get the pistons, CCs, and main/rod bearings coated for little over $200, didnt think that was all that bad compared to other places, but if I can get the materials for cheap and do it myself I just might.

 

I had my Hooker long tubes coated @ Swain. The coating has a rougher texture than Jet Hot or HPC and it's white. The bad thing is that even saying the word "dirt" will leave a mark on them. Not a major problem, but annoying at first. I just sold them, so I should still have some pictures around of them. A friend of mine just sent his turbo headers & exhaust housings off to them to be coated. Hopefully they'll be back next week...hopefully.

I will have my turbo logs, wastegates, exhaust housings and downpipes done by them as well. Definite thumbs up on their work and customer service.

 

yeah, whenever my dad does it, its just a matter of getting out the touchup spraygun and masking them off. soon as you are done, toss them in the oven. i looked out in the garage and we have allot of the same kinds of coatings that one of the links in here had.

 

http://www.quarter-mile.net/03buildu...s/MVC-001F.JPG
http://www.quarter-mile.net/03buildu...s/MVC-002F.JPG
http://www.quarter-mile.net/03buildu...s/MVC-003F.JPG

The second pic is a little screwed up, but gets the point across.

 

Mines are black and have a rough texture as well...
the inside coating looks like yours outside...

I wonder if it keeps the heat better the coating from swain than from jet hot.

 

That reminded me of my Material Science professor from a couple years ago. He was adamantly "anti-Teflon" for food preperation. I left the course with the impression that he was a very qualified brilliant professor. In addition to being PA dutch, its another reason to continue liberal use of butter as my non-stick agent of choice.

-brent

 

So it sounds to me like the most benefit would come from getting a TBC on the piston domes and CC of the heads, and maybe coating the bearings with whatever they use. Doesnt sound so far like there is a whole lot of benefit from coating the skirts of the pistons as long as it is assembled well with good rings and such.

One site I found (http://www.performancecoatings.com/enginecoatings.html) it runs $30 a cylinder for the piston dome and CC ($15 piston/$15 CC) which is a measly $240 and could benefit a lot from doing so correct?

 

What I would like to know is if there was any real difference in coolant temps with the chambers and exhaust ports coated!!! that is the most important thing for me right now.. I dont care if it gives me 3HP or 0HP!

 

I would imagine it would have to. Someone above was even saying that, I mean if you keep 10% (random#) more heat in the combustion chamber, you will keep 10% more heat out of the coolant passages if it cant transfer through to the coolant.

I dont know if the exhaust ports being coated would affect the coolant temps at all, but it might help if it were an extremely slick coating where the gases would escape easier.

 

TEA told me that it wasn't worth it... better the pistons if not.. nothing

 

Wastn worth what, the CCs or the exhaust ports, I cant see coating the exhaust ports doing anything, but engine logic would say that a piston/CC thermal barrier coating would definitely help in both ways, hp and cooling i would think. trapping more heat in there is good, and it keeps that excess heat out of the passages, but im a novice im just trying to use logic to explain myself, not experience