V2Rocket

eventually i will get my headers ceramic coated inside and out...should take things down nicely

as for room for a WB02 there is all kinds of room down at the 2-1 pipe for another sensor. you could probably fit 2 or 3 lol

Bri Bro

I saw some pictures of an engine that had the intercooler pipes coated inside and out. The coating didn't take well on the inside and pealed off. This destroyed the turbo and he lost lots of compression in the cylinders. After that, I decided that coating inside of a pipe might not be a good idea on a Turbo. On the n/a, not a big concern on the exhaust pipes.

I had my headers coated (Turbo-X 2000) by these folks, good price and fast turn around.
http://www.thermaltechcoatings.com

krystar

http://www.jet-hot.com/ for header coating.

V2Rocket

i suppose it wouldnt be such an issue on a NA car but i guess it could be avoided anyways

phil823

i was just refuring to the header WRAP...its simple, cheap and has been shown to marginally work when wrapped correctly! i use it on motorcycles, and other cars alike, its not as good as a powder coat i dont believe though.

Bri Bro

The issue I have with wrap is that it will dry out over time and act like a sponge to liquids. Oil, and even anti freeze will be absorbed and act like a wick to an oil lamp...fire.

phil823

your supposed to spray coat the Wrap with HIGH heat silcone spray. its supposed to seal it from absobing liquids, although not many seem to use the coating!

whalebird

Header wrap is a good idea on paper, but causes problems on street cars as posted above. The stock headers from a late model(4-2-1) along with the stock exhaust is better than(at least as good) as any aftermarket exhaust available for these cars. The factory had it all figured out. Webcam is the last word in Porsche camshafts and will deliver whats promised.

944CS

I never understand this logic. The wrap doesn't burn. Oil smokes but doesn't light. How is a fire going to be started?

Bri Bro

If you reach the temperature of ignition of a compound with an oxidizer present (air), you will get combustion. If you have a oil leak, and the wrap gets soaked, the oil will vaporize and any source of temperature in excess of the temperature of ignition (spark, header temp, etc) will start the combustion. The combustion is sustained because the soaked wrap feeds oil vapor to the combustion. The odds of getting combustion before the oil completely vaporizes from the wrap are not that good, but the smell will drive you nuts.

A good example of combustion without a spark is a pile of oiled rags. Given enough time, they will heat up enough to start a combustion without a spark source. Another source of combustion is anti freeze. Ethylene glycol has an auto ignition temperature of 775°F.

944CS

I guess I just don't see anyone having that bad of an oil leak problem without it being addressed...I agree the smell and contaminants would prevent me from driving the thing

911racer

I have dumped (on a track car) oil on the exhaust wrap and no fire. It would seem that the temperature required for ignition where the air source is located (at the outside of the wrap) never gets high enough to sustain ignition.

Ed

Sterling Doc

I have seen an under hood fire on a 944 when an oil filter failed or came loose (not sure why) - it's right in front of the headers. I have also seen them go w/o causing a fire on my own car (balance shaft out of time caused the oil filter to come loose).

911racer

I can tell you that a VERY loose cam cover can leak a lot of oil and not cause a fire. (I drive the Poleizi car) I have had the oil filter seal fail too. (not sure why mine did except for maybe cold oil)

Ed

fortysixandtwo

With the exception of bursting oil filters (this should not happen either) I don't see how adding header wrap should cause a combustibility problem.
The argument is that the wrap will help maintain a burn. My problem with this reasoning is, that says it's okay if the oil leaking on your exhaust catches fire with no wrap because it will burn out quickly.
Autoignition is autoignition, the same conditions will cause an oil fire, wrapped or not. If you have the time and money to add header wrap but have oil leaks, you're spending your time and money in the wrong place. Fix the oil leaks first!
Then:
-You don't have to worry about oil fires
-Your car will not smoke and smell like burt oil
-Your car will no longer mark it's territory on your friends' driveway. (This is like bringing a pet over and having it pee on their living room rug)
-You'll spend less money on oil
-You'll also be less likely to run low on oil.