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Old 12-15-2005, 09:50 PM   #1
UltimateLurker
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Default What makes a muffler go bad?

1. Rust?
2. A baffle breaking loose?
3. The packing coming apart?

Some of these after-market mufflers are little more than straight-through pipes with some perforations for fiberglass, how long will they last?
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Old 12-15-2005, 11:23 PM   #2
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Yes, yes, yes.

Some will succumb to road-hazard impact, backing into high curbs, etc, and bad welds that give up. The cherry-bomb style cans can last longer or shorter, for any of the same reasons. The better ones will outlast the crappier ones. If you live in a coastal area that sees salted roads in winter, corrosion will probably be the biggest killer of exhaust parts.
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Old 12-16-2005, 09:53 AM   #3
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A weak constitution and hanging out with a bad crowd will cause a muffler to go bad.

Seriously, rust may cause it to go bad, but accumulating moisture is where the rust comes from. During a short trip, you will warm up the exhaust system enought just produce moisture. When you park after a short trip, that moisture sits in your exhaust system, usually in your muffler, as it is the most restrictive section. If you have a decent commute without a lot of stopping, you heat the system up enough to evaporate the moisture out of the muffler, and it will last much longer. Moisture build up is worse in cold temps.

I have had great luck will all the factory Honda and Subaru mufflers that I have had. I also had a quality aftermarket performance cat-back system that lasted forever, too. I think you get what you pay for. I remember getting $60 lifetime-warrantied mufflers for my Accord, and after my third one, i went back to an OEM unit.

I would think a straight-through design would harbor moisture so much because it is less restrictive.
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Old 12-16-2005, 10:41 AM   #4
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Salt is a big problem here in Rochester. I get my car washed multiple times throughout the winter to get salt off the exhaust, but a lot of people wait until the end of the winter which gives that salt time to chew away at exhaust bits.
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Old 12-16-2005, 11:07 AM   #5
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The bearings just wear out over time. High heat and such
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Old 12-16-2005, 11:11 AM   #6
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Your muffler has bearings?
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Old 12-16-2005, 11:11 AM   #7
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Hanging out with a bad crowd? Drinking beer at an early age?




*not allowing for the condensation to burn off inside between start up and shut down.
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Old 12-16-2005, 11:20 AM   #8
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Quote:
Originally Posted by Master2192
The bearings just wear out over time. High heat and such


Mufflers don't have bearings.

This is what happens when you fall asleep at the mouse.
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Old 12-16-2005, 11:23 AM   #9
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Quote:
Originally Posted by conker69


Mufflers don't have bearings.

This is what happens when you fall asleep at the mouse.
Yeah, mufflers don't have bearings just like blinkers don't have blinker fluid. Come on get with the program.
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Old 12-16-2005, 11:29 AM   #10
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Quote:
Originally Posted by emorphien
Yeah, mufflers don't have bearings just like blinkers don't have blinker fluid. Come on get with the program.
That reminds me...I need a new hood scoop plug and some more turbo boost fluid.
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Old 12-16-2005, 11:29 AM   #11
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Hey!! I want muffler with bearings....
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Old 12-16-2005, 12:14 PM   #12
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Some mufflers DO really have bearings. :-) Well, the mufflers are mounted on bearings. The exhaust system of a very large engine like those used for 2500 kVA generators (65 to 70 liter engines) expand as they heat up. So the mufflers are mounted on bearings to allow them to expand.
Richard
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Old 12-16-2005, 12:25 PM   #13
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Quote:
Originally Posted by conker69


Mufflers don't have bearings.

This is what happens when you fall asleep at the mouse.
yes...they do!
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Old 12-16-2005, 12:46 PM   #14
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Any high power diesel generator in-the-know person knows you don't refer to generators in kVA rating. 2000kW (2MW) FTW!

-Jason
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Old 12-16-2005, 01:39 PM   #15
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Ah yes, muffler bearings and blinker fluid. This season, also be sure to change the oil in your tires and rotate your radiator.
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Old 12-16-2005, 01:40 PM   #16
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If you're rotator splint gets water-logged, some rust will form and then your muffler is as good as garbage
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Old 12-16-2005, 01:47 PM   #17
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My experience

The previous owner of a 86 Mazda MX-6 I owned went up skiing a LOT. As a result, a lot of the underside was rusted, which ate up the cat back and muffler. I eventually had to replace both because rust had eaten through the layers of the muffler and holes appeared. The cat back pipe also rusted to a point where a hole was ripped open by the exaust.

My relative's Audi had a cat that deteriorated and was shot down the exhaust until it got trapped in the baffled muffler which caused it to massively restrict and make lots of annoying noises. (Like cotton in a pipe)

My Civic has lived in the garage at night all its life and I never went to the snow with it. The muffler, although aged, is still in great shape. I did scrap up the mounting bolt of the tip going down a stupid parking lot exit.
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Old 12-16-2005, 02:00 PM   #18
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Mufflers don't have bearings? What about these?

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Old 12-16-2005, 02:08 PM   #19
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If your piston return springs go bad then it can cause your muffler to rust.
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Old 12-16-2005, 02:43 PM   #20
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Quote:
Originally Posted by avatarr
Any high power diesel generator in-the-know person knows you don't refer to generators in kVA rating. 2000kW (2MW) FTW!

-Jason
Thank goodness I don't have to know about generators. After all, specifiying them is how I make my living.
Richard P.E. in electrical power for facility design.
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Old 12-16-2005, 04:30 PM   #21
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that's why I use synthetic blinker fluid and carbon fiber plated turbo wires

no bad bearing for never!!!
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Old 12-16-2005, 04:43 PM   #22
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just make sure to change the belts on your muffler and turbo and you shouldnt have any problems.
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Old 12-16-2005, 05:56 PM   #23
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Yeah, but if you use direct injection to the catalytic converter, then you can often exceed advance timings on the compression ratio; but that's easily fixed by adding a BOV before the MAF sensor but after the 2nd O2 sensor.

Last edited by chimchimm5; 12-16-2005 at 06:02 PM.
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Old 12-16-2005, 07:10 PM   #24
hikeeba
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Wow, it didn't take long for this thread to start circling the drain.

I did quite a bit of research on this today, and I can confirm that excessice exposure to salt and moisture are leading causes of a muffler going bad. Another cause could be an unhappy trunk monkey, trying to get back at you for ill treatment. Beware, trunk monkeys can be very vengeful.
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Old 12-17-2005, 03:27 AM   #25
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drugs... and porn
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