Exhaust Pipe Material Q
07-26-04, 06:40 PM
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Exhaust Pipe Material Q
HAd a flange made to bridge the gap between a RB down pipe and main cat on a vert. Asked the guy like 20 times to use SS. Picked up the flange today and saw that the pipe used was not SS. the owner of the shop said it was aluminized or something like that. So for you exhasut guru's - is this thing going to melt?
07-26-04, 10:32 PM
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I doubt it... An exhaust shop wouldnt use metal that would melt. If its a fab/mach. shop, and u told them what it was for, they probably used something that wont melt.
I took my engine to turbo manifold stuff in today to have it welded, i made sure to tell them what it was for, so they wouldnt use crappy material on it
I took my engine to turbo manifold stuff in today to have it welded, i made sure to tell them what it was for, so they wouldnt use crappy material on it
07-26-04, 10:36 PM
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should have seen this guys face when I reminded him it was going in a high temp application. I have never used this stuff. Unless someone knows for sure I am just going to grind this crap out (which is to bad becasue the welds are great0 and buy my own pipe for a reweld.
07-26-04, 10:41 PM
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Actually, exhaust shops are retards. It's aluminzed steel. The idea is, coat it in aluminum so it doesn't rust. Problem is, the aluminum will burn off within a week, and then it'll rust.
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07-27-04, 08:01 AM
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Incase this wasn't implied from my first post. The aluminized crap will burn off after a week, the pipe itself won't melt. I've seen upwards ~900C on EGT without a problem, however, since the aluminized crap burns off, the pipe then begins to rust. That's the only downside.
07-27-04, 08:08 AM
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Originally Posted by SonicRaT
Incase this wasn't implied from my first post. The aluminized crap will burn off after a week, the pipe itself won't melt. I've seen upwards ~900C on EGT without a problem, however, since the aluminized crap burns off, the pipe then begins to rust. That's the only downside.
I have had a MS midpipe on my Impreza for two yrs with no rust, but they dont put that salt **** on our roads in the winter..
07-27-04, 08:51 AM
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Is it aluminized? Chances are you didn't burn the aluminized coating off if it is, or it's painted. Mine hasn't seen a tinge of winter driving and it's got surface rust already because the damn **** burnt off. The exhaust shop was mighty surprised that it was rusted when I brought it back to them to have my mufflers moved.
07-27-04, 09:17 AM
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Originally Posted by SonicRaT
Incase this wasn't implied from my first post. The aluminized crap will burn off after a week, the pipe itself won't melt. I've seen upwards ~900C on EGT without a problem, however, since the aluminized crap burns off, the pipe then begins to rust. That's the only downside.
-Joe
07-27-04, 10:28 AM
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thanks guys, didnt want to go through the hassle of replacing this pos part after its been run for a few thousand miles. Going to get some header paint and slap it on.
I have to tell you I am real impressed with the RB catback. I have used the old ones (black upto the tip). the new all stainless one not only looks great, it fits better and sounds better. Plus its as rock solid as the factory system was when it was new.
I have to tell you I am real impressed with the RB catback. I have used the old ones (black upto the tip). the new all stainless one not only looks great, it fits better and sounds better. Plus its as rock solid as the factory system was when it was new.
07-27-04, 10:58 AM
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Originally Posted by OverDriven
The aluminized pipe I use has the aluminum mixed in. Its not a coating and so it doesn't burn off.
-Joe
-Joe
07-27-04, 12:43 PM
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I wasn't aware the two would mix. Never heard of that at all, but it sounds kind of strange since they'd contract/expand at different rates you'd think it would be more prone to cracking. Interesting, time to start digging around for more info!
07-27-04, 01:41 PM
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Steel melts at around 1300, aluminum melts around 660 degrees F. They use aluminized steel for diesel exhausts and it doesnt melt off. They basically dip steel into molten aluminum. The aluminum is more corrosion resistant than the steel (good). It also forms an alloy layer in between the steel and aluminum that does 2 things. It decreases the thermal conductivity of the metal (good for exhausts), and it helps the aluminum bond to the steel (also good).
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