Again, why not aluminum mufflers.

Again, why not aluminum mufflers. - 01/26/10 02:17 AM

First. Is it the temperature being too high where they may fatigue: I think the temps are manageable at that section of the exhaust system.
Too low that they would not work properly in scavenging the exhaust pressures etc. ie: pressure drop and exhaust speed slow down.

Corrosion gases or chemicals from exhaust fumes/gases that would make the muffs not last long at all.

I would like to make a set if you metal gurus think it can be done.

Posted By: MR_P_BODY

Re: Again, why not aluminum mufflers. - 01/26/10 02:25 AM

Its the corrosion... the acid will eat them up
EDIT
the temps that fat back are in the 200-250 range
which isnt bad at all

Posted By: fullmetaljacket

Re: Again, why not aluminum mufflers. - 01/26/10 02:36 AM

The acid would eat them up how fast in theory?
Titanium would be great but way too expensive.

Posted By: MR_P_BODY

Re: Again, why not aluminum mufflers. - 01/26/10 02:43 AM

Quote:

The acid would eat them up how fast in theory?
Titanium would be great but way too expensive.

That would be hard to say but could be anywhere
from a couple of months on and what the fuel is.
Titanium would defiantly be out of the question for
a factory/production aspect due to cost,(hell they dont
even want to run stainless anymore)they prefer the
junk aluminized that barely makes it 2 years

Posted By: RADAMX

Re: Again, why not aluminum mufflers. - 01/26/10 03:38 PM

I have had aluminum muffs on my car for at least 10 years.
They are 6 inch round and about 14 inches long 3.5 straight through design .I can take them apart and repack with muffler packing .
I have never seen any signs of corrosion at all...
I have tail pipes over the rear all the way to the rear bumper

Posted By: sdaurity

Re: Again, why not aluminum mufflers. - 01/26/10 05:09 PM

There is a guy over on the bullet that makes alum. mufflers that can be re-packed. Lots of people run them on alum. exhaust systems with turbos. My new turbo set-up has 4" alum. exhaust.

Posted By: go green

Re: Again, why not aluminum mufflers. - 01/26/10 06:08 PM

I use 4" aluminium tube right off the turbo .

Posted By: fullmetaljacket

Re: Again, why not aluminum mufflers. - 01/27/10 04:23 AM

Going A-wall Alloy.

Posted By: fullmetaljacket

Re: Again, why not aluminum mufflers. - 01/27/10 04:27 AM

Bullet who, what, where?

Posted By: jcc

Re: Again, why not aluminum mufflers. - 01/27/10 01:03 PM

I would think that corrosion would mainly be a factor with combustion liquids condensation (Ie low temps) or short duration useage by not coming up to full temp. Erosion would be from high temp corrosive fast moving gases and slower to harm. I have never heard of Alum mufflers before. I would think a Ti muffler would be doable, albeit at high but reasonable cost, even home made. Sounds interesting. And remember that alum loses a lot of strenght at even 400F, a small backfire at operating temp and I would bet an Alum muffler would open right up. Alum with a decent amount of continuous outside cool air flow I guess is needed for durability. Header wrap would likely be no-no, but you could also jet coat it inside and out (if no packing) for additional lifespan.

Posted By: MR_P_BODY

Re: Again, why not aluminum mufflers. - 01/27/10 01:22 PM

Quote:

I would think that corrosion would mainly be a factor with combustion liquids condensation (Ie low temps) or short duration useage by not coming up to full temp. Erosion would be from high temp corrosive fast moving gases and slower to harm. I have never heard of Alum mufflers before. I would think a Ti muffler would be doable, albeit at high but reasonable cost, even home made. Sounds interesting. And remember that alum loses a lot of strenght at even 400F, a small backfire at operating temp and I would bet an Alum muffler would open right up. Alum with a decent amount of continuous outside cool air flow I guess is needed for durability. Header wrap would likely be no-no, but you could also jet coat it inside and out (if no packing) for additional lifespan.

I myself would prefer a nice 300 series SS muffler
over anything else.... would look nice , all shiney
and would have a nice long life..... I need to finally
replace the SS muff on my Jeep(94) with 228K on it

Posted By: fullmetaljacket

Re: Again, why not aluminum mufflers. - 01/27/10 04:32 PM

The reason of course I brought this up is because of excessive exhaust weight these days with noise rules and all on Race cars as well as Street cars that race on the track.
I thought of a Stainless muff, but to get the kind of weight savings I'm thinking of, it would have to be of a thin wall Stainless which would bring the noise levels up substantially. Hence noise control.
I've noticed that the thicker the muff body, the better the noise retention, hence heavy muffs on the market for better noise decibels.
I'm going to experiment.

Posted By: Craig

Re: Again, why not aluminum mufflers. - 01/28/10 03:48 PM

I've seen bikes with carbon fiber mufflers that were light as a feather and relatively quiet. Probably can't do them yourself, but wouldn't someone make them for the high dollar cars?

Posted By: B1KILLER

Re: Again, why not aluminum mufflers. - 01/28/10 04:22 PM

Quote:

I've seen bikes with carbon fiber mufflers that were light as a feather and relatively quiet. Probably can't do them yourself, but wouldn't someone make them for the high dollar cars?

I know they make them for imports, I would buy them
if they made them for my car

Posted By: mafo

Re: Again, why not aluminum mufflers. - 01/28/10 04:48 PM

These Swedes make custom carbon mufflers
http://www.speed-tech.se/system/visa.asp?HID=426&FID=471&HSID=5602