Simple, its during the tempering process. The colors depends on the metal content and the temperature. Purple to blue on stainless steel is typically 450-600°. Higher chromium content or a chromium coating will make most metals more resistant to tempering...
i appreciate people for asking questions instead of thinking they know everything.. if you dont know you dont know! you got to ask to learn... ther is alot of people on IA that talk alot and dont know anything..
i dont know myself so i googled it..
seems like speedminded was right!
Gold and blue pipes result because the exhaust is running too hot. There are three reasons for this. The first, most common reason, is that the bike is running lean. A lean mixture causes exhaust temperature to rise very sharply. A slightly rich mix WILL NOT CAUSE BLUED OR YELLOWED PIPES.
However, a *VERY* rich mix can result in an extreme case of bluing. This happens when the mix is not completely burned in the combustion chamber, (either due to a too rich mix, malfunctioning coil, burned valve, improper timing, or whatnot) and rather ignites INSIDE THE EXHAUST. This can result in an exhaust pipe that GLOWS RED while the bike is running. Only in this extreme case can a too-rich mixture cause bluing.
The common myth that blue is lean and gold is rich (or the reverse) is just that. A myth.
Third, long periods of idle can cause pipes to blue because there isn't any airflow to blow off the heat. (Some people let their bikes idle WAY too long upon start up before they take off)
Some pipes can not be restored to the original chrome finish. Others can come back close with using Blue Away.
If the pipe(s) doesn't come back to looking like you want, chances are there is an exhaust cover (chrome plated) you could put on the pipes so the blue doesn't show
True, but the thing is is that it's faster to google/search it than to post it on the forums and wait for an answer. A right answer that is.Originally Posted by JITB
VTECH ... Making phones since 1994.
Looking for Integra Sedan (DB7/8) parts <--clickable
Q:Nitrous on stock LS high mileage. Too risky?
A:IMO nos is like steroids and giving steroids to a grandma doesnt sound all that good to me!
most if not all headers go through some type of machining process and in order to machine metal...oil is use in the cutting and drilling stages...some of that oil transfer onto the product....most manufacturers leave the oil on there on purpose to help prevent rusting...you can do like whathisface said and wipe it off but it will burn off eventually anyways...just like the oil on new brake rotors....ever install new one and notice them smoking?
i spray oil on my rotors and let them smoke regularly ....cuz i am badass
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