Muffler Rusty?
11-03-2008 | 04:17 PM
#51
JK Enthusiast
Joined: Feb 2008
Posts: 241
Likes: 0
From: Atlanta, GA
this sounds like something I have to try...I was just waiting for it to rust out so I could replace it with an aftermarket one. To the person who replaced theirs with the banks....how do you like it.
11-03-2008 | 06:49 PM
#52
JK Newbie
Joined: Aug 2008
Posts: 96
Likes: 0
From: Vista, Ca
I have not yet experienced the rust. But it is interesting to not that stainless is not stain proof, regardless of grade. Even 316 stainless (much better than 304), will develop surface rust if it is left in stagnant water. This has to do with the material being unable to develop its protective coating without the presence of oxygen. You will note that when the engine is cold, a lot of water is exhausted out of the engine, and is left to sit in the muffler.
As far as 409 being a cheaper stainless, I doubt that is true. In engineering, the different grades of stainless are chosen for different properties. Some of the 400 series do not work harden. They are great for cold heading or die casting or hydro-forming etc. 304 work hardens, and may not be suitable with the production methods they are employing.
As far as 409 being a cheaper stainless, I doubt that is true. In engineering, the different grades of stainless are chosen for different properties. Some of the 400 series do not work harden. They are great for cold heading or die casting or hydro-forming etc. 304 work hardens, and may not be suitable with the production methods they are employing.
11-07-2008 | 12:33 PM
#55
JK Enthusiast
Joined: Feb 2007
Posts: 196
Likes: 0
From: North Carolina
Only sure way to keep it from rusting is... move outa the North. lol Just kidding, I'm sure there are a lot of southerners with rusty mufflers. You can come get mine if you want to start fresh with a new one. It is on the garage floor. 
11-07-2008 | 04:11 PM
#56
JK Jedi Master
Joined: Feb 2008
Posts: 12,882
Likes: 172
From: Maine
I have not yet experienced the rust. But it is interesting to not that stainless is not stain proof, regardless of grade. Even 316 stainless (much better than 304), will develop surface rust if it is left in stagnant water. This has to do with the material being unable to develop its protective coating without the presence of oxygen. You will note that when the engine is cold, a lot of water is exhausted out of the engine, and is left to sit in the muffler.
As far as 409 being a cheaper stainless, I doubt that is true. In engineering, the different grades of stainless are chosen for different properties. Some of the 400 series do not work harden. They are great for cold heading or die casting or hydro-forming etc. 304 work hardens, and may not be suitable with the production methods they are employing.
As far as 409 being a cheaper stainless, I doubt that is true. In engineering, the different grades of stainless are chosen for different properties. Some of the 400 series do not work harden. They are great for cold heading or die casting or hydro-forming etc. 304 work hardens, and may not be suitable with the production methods they are employing.
I have not found a direct cost comparison, but one of the reasons repeatedly given for using 409 SS is a more favorable cost.
11-08-2008 | 02:35 PM
#58
JK Jedi Master
Joined: Feb 2008
Posts: 12,882
Likes: 172
From: Maine
11-08-2008 | 04:25 PM
#60
JK Enthusiast
Joined: Nov 2008
Posts: 194
Likes: 0
From: Denver, CO
Painting the muffler makes it look 1000% better! I know what I'll be doing tomorrow. For the guys that have painted it, are you doing it with the muffler still on the Jeep or are you taking it off first?