moremazda

[quote name='1Revvin7' date='Sep 7 2005, 12:00 AM']That was done for a reason, I actually cut that out this morning. I only used an RB flange, because it was handy. I have had my own flanges cut recently.



If I do mass produce these, I have decided its going to be 304SS, ceramic coated inside and out, and it will mate to the stock cat.


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There is absoluty NO advantage to using 304 stainless steel over mild steel if you plan on using ANY kind of coating.

teknics

[quote name='moremazda' date='Sep 11 2005, 09:07 PM']There is absoluty NO advantage to using 304 stainless steel over mild steel if you plan on using ANY kind of coating.


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that was what i was thinking. why use stainless and then coat it? kinda negates the use of stainless to begin with.



kevin.

mazdaspeed7

You can run a thinner wall with stainless because its less likely to sag at the temps it will see than mild steel of the same thickness. Thinner wall = less weight.

Dramon_Killer

not bad, nice header though personally i think that rotaries were made to be boosted.

teknics

[quote name='mazdaspeed7' date='Sep 13 2005, 12:16 AM']You can run a thinner wall with stainless because its less likely to sag at the temps it will see than mild steel of the same thickness. Thinner wall = less weight.


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yea but if you coat the mild steel then the coating will absorb the heat and not the metal, isnt that the purpose? it prevents the heat from escaping by absorbing or blocking it, the heat that actually reaches the metal itself is lower temps by the time it hits raw metal past the coating.



kevin.

mazdaspeed7

But the same would apply to coated mild steel. Stainless steel is more than just a prettier version of mild steel. Its more corrosion resistant, and it retains its mechanical properties better at high temp than mild steel.



The coatings help, but they help SS just as much as mild steel. Cost is the only reason I could see for not using SS.

1Revvin7

[quote name='mazdaspeed7' date='Sep 13 2005, 03:00 PM']But the same would apply to coated mild steel. Stainless steel is more than just a prettier version of mild steel. Its more corrosion resistant, and it retains its mechanical properties better at high temp than mild steel.



The coatings help, but they help SS just as much as mild steel. Cost is the only reason I could see for not using SS.


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89 Rag

304 ceramic coated stainless sounds like an all around great product to me.



Why would anyone need to complain about a great product?

mazdaspeed7

[quote name='89 Rag' date='Sep 14 2005, 01:50 AM']304 ceramic coated stainless sounds like an all around great product to me.



Why would anyone need to complain about a great product?


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Thats what Im trying to figure out. But Id at least like to be able to read the RB flange after the header is installed

89 Rag

[quote name='mazdaspeed7' date='Sep 13 2005, 11:05 PM']Thats what Im trying to figure out. But Id at least like to be able to read the RB flange after the header is installed


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Can't really see it anyway, unless you're on a creeper under the car



Prototypes are rarely perfect, by the time you make the 2nd and 3rd, it becomes a work of art.