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Originally Posted by TitaniumTT
The coating on the exhaust mani's is still intact although is has changed color slightly (although that happened quick and hasn't deteriorated anymore) and the coating on the intake mani's is still perfect.
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Yes that will happen. It is the pigment in the coating that doesn’t handle the heat and will fade to a degree when you heat it. This is a common and know side effect which I have yet to find a solution to solve. The ceramic media is not effected just the depth of the color. Some colors will fade less than others but will have a lower heat threshold.
Quote:
Originally Posted by TitaniumTT
Thanks again Anthony. I'll definately be sending you some more piping in the near future as I changed a few things from last year.
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Well thank you for the complement and I will be happy to help you in the future.
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Originally Posted by FDDandata
thanx, yall really went in on this ? more than i expected. Im just a little lost on one answer. I still didnt read thru all the reference material but im guessing low thermal conductivity material is good, and if high or low density is good or not, or if it matters, and not sure what "cp" stands for or what the R rating is. Im guessing level of insulation.
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The use of a High or Low thermal conductivity material really depends on what your working with and trying to accomplish both have desirable characteristics depending on the application. As far as your exhaust pipe goes you would want to use a material that is low in thermal conductivity.
“Cp” Stray Capacitance.
“R” basically put is the measurement of the insulations ability to resist the flow of heat, the higher the value the more effective it is in slowing or stopping heat flow.
Quote:
Originally Posted by FDDandata
To add to that, does thermal expansion play a factor in wrapping or coating. How im thinkin, if you wrap or coat a pipe when the pipe expands from heat i would think either the wrap would stretch a little since it wouldnt expand as much as the pipe on its own(or if coated the ceramic coating would spread & crack) and when the pipe cools the wrap wouldnt be as tight as initially wrapped. I would think something like that would happen but i guess it doesnt, unless the wrap keeps expansion in line or theres a way its compensated for. Dont know if im headin in the right direction with that but the thaught popped up
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Yes thermal expansion does play a role, and your assumptions are correct. Yes the pipe will expand and contract to some degree depending on the material it is made of and the amount of temperature it sees from the cycling of the heat. Your wrap will also be stretched over time but not like you would imagine very small amounts and depending on how well it was wrapped will most likely not be an issue. Your wrap will probably be ready to be replaced long before it has stretched to any measurable amount. The coating will also expand and contract with the pipe. Most coatings use a binder to hold the ceramic material and pigment together and against the part. Depending on the quality of the coating it will have some ability to flex with this expansion. Over time though all coatings will eventually loose this flex and begin to fail. However this is a process that a good properly applied coating will take years to happen to.
From my experience with in the racing field most racers choose to replace wraps or rewrap parts every couple of years. Some racers will have me recoat parts at the same frequency and some will recoat much sooner for an appearance aspect due to the required frequency of appearance requirements with their contracts.
In all honesty both are well worth the expense and you will see performance gains from both.
Hope that answers your questions better.