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Exhaust Pipe Rust or Dirt?

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Old Jul 31, 2013 | 10:40 AM
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Default Exhaust Pipe Rust or Dirt?

Watch this C7 video. Then notice that the exhaust pipes look like they might have rust in them.

http://jalopnik.com/the-2014-corvett...miss-913824179

Is it rust or dirt? Rust seems kind of odd for such a young car, but I suppose anything is possible.

PS: I'm still getting one of the first ones out. (#94 on GMer's list.)
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Old Jul 31, 2013 | 10:54 AM
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I can't open that vid on my phone, but I think I've seen what you're talking about. It looked like heat discoloration to me, and it seemed more pronounced on the two outside valved pipes. That's my guess.
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Old Jul 31, 2013 | 11:10 AM
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Originally Posted by MikeG37
I can't open that vid on my phone, but I think I've seen what you're talking about. It looked like heat discoloration to me, and it seemed more pronounced on the two outside valved pipes. That's my guess.
Whatever it is, it should not be there. I'm wondering, hoping really, that one can wipe it off when cleaning, but unfortunately, rust, (if it is rust) does not wipe off.
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Old Jul 31, 2013 | 11:59 AM
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Some chrome polish should take care of it.
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Old Jul 31, 2013 | 12:00 PM
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My solution to that is to get high temperature silver powder coat applied to the exhaust.

With silver painted rims, matching silver powder coat exhaust tips instead of polished or chrome looks so much better.
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Old Jul 31, 2013 | 12:16 PM
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If you are talking about the exhaust tips, they are polished stainless steel - no rust. But you will get combustion by-products build-up on them. It can be cleaned off.

Exhaust, aluminized stainless-steel with 3" polished stainless-steel tips
NPP Exhaust, dual-mode, performance, increases horsepower (5HP), aggressive exhaust sound, with 4" polished stainless-steel tips
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Old Jul 31, 2013 | 12:35 PM
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Originally Posted by Zymurgy
If you are talking about the exhaust tips, they are polished stainless steel - no rust. But you will get combustion by-products build-up on them. It can be cleaned off.
I'm looking at the rust colored discoloration on the inside of the far right exhaust tip in the video link I sent in the OP.

And I do hope it can be cleaned off.
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Old Jul 31, 2013 | 12:44 PM
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The factory polish of the tips is not that great. Here is the solution.

http://www.qpcpv.com/topflightreproductions/id12.html

I use this kit on my C6 NPP and it makes the tips shine like a mirror. If you don't want to buy this kit you can get the materials at any metal polishing supply, the kit is nice because they provide the right size buffing pads and all the compounds you need in one package.
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Old Jul 31, 2013 | 12:45 PM
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Originally Posted by Dracla
I'm looking at the rust colored discoloration on the inside of the far right exhaust tip in the video link I sent in the OP.

And I do hope it can be cleaned off.
That is what I thought you were talking about. The tips are polished stainless steel. Stainless steel generally will not "rust". The tips can definitely be cleaned. In fact, frequent cleaning is one of the best ways to prevent stainless steel corrosion. Do not use abrasives.
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Old Jul 31, 2013 | 01:23 PM
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Originally Posted by adamsocb
The factory polish of the tips is not that great. Here is the solution.

http://www.qpcpv.com/topflightreproductions/id12.html

I use this kit on my C6 NPP and it makes the tips shine like a mirror. If you don't want to buy this kit you can get the materials at any metal polishing supply, the kit is nice because they provide the right size buffing pads and all the compounds you need in one package.
2 Qs.

1) Does it use anything abrasive?

2) Got any pictures you can post?
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Old Jul 31, 2013 | 01:52 PM
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It's the soot that collects on the WILD pipes. On the current Z06 the inner pipes are the WILD ones. On the C7 the outer pipes are the loud ones. Comes off with a dust rag.
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Old Jul 31, 2013 | 04:23 PM
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Originally Posted by Duke/Earl
It's the soot that collects on the WILD pipes. On the current Z06 the inner pipes are the WILD ones. On the C7 the outer pipes are the loud ones. Comes off with a dust rag.
You might be right, but...

I though soot was black, or grey/black but not redish. So this looks more like rust, but I'm hoping I'm wrong. And I understand rust can't take hold on chrome, but that just raises the question as to what it really is.
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Old Aug 2, 2013 | 05:58 PM
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Originally Posted by Dracla
You might be right, but...

I though soot was black, or grey/black but not redish. So this looks more like rust, but I'm hoping I'm wrong. And I understand rust can't take hold on chrome, but that just raises the question as to what it really is.
Stainless steel, not chrome. Some stainless steel can rust.
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Old Aug 2, 2013 | 06:34 PM
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Cheap stainless rusts. Note enough chrome. Get some home depot bolts and use them where there is lots of water, like on a boat. You'll see rust spots.
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Old Aug 2, 2013 | 10:37 PM
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My '86 vette always got a lot of soot on the back end. Always hated cleaning it, but I was hoping those old days would be gone when I get a C7. The '86 was white so it made it very apparent. SJ
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Old Aug 3, 2013 | 07:45 AM
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I was using Simichrome back in the 80's on my BMW R100RT bike. It's just one of those things every detail person should own. Worked like magic on the chrome and really good for removing the light scratches on the plexiglass windshield. Worked on all polished metal surfaces such as alloy's too. Rub it on, then rub it off.
Originally Posted by Dracla
2 Qs.

1) Does it use anything abrasive?

2) Got any pictures you can post?
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Old Aug 3, 2013 | 11:53 AM
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Originally Posted by stevelischynsky
Cheap stainless rusts. Note enough chrome. Get some home depot bolts and use them where there is lots of water, like on a boat. You'll see rust spots.
It is not a matter of cheapness, it is a matter of the alloy. 300 series does not rust, 400 series does get surface rust. 400 is stronger so it has its uses.
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Old Aug 3, 2013 | 12:01 PM
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Simichrome, buff, power drill. Done.
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Old Aug 3, 2013 | 02:14 PM
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Originally Posted by Dracla
Watch this C7 video. Then notice that the exhaust pipes look like they might have rust in them.

http://jalopnik.com/the-2014-corvett...miss-913824179

Is it rust or dirt? Rust seems kind of odd for such a young car, but I suppose anything is possible.

PS: I'm still getting one of the first ones out. (#94 on GMer's list.)
What are you looking at? This is a long video.

Michael
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Old Aug 3, 2013 | 02:53 PM
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Originally Posted by Michael A
What are you looking at? This is a long video.

Michael
The right hand exhaust pipe shows up at least twice in the video and it has something that looks redish on the inside.
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