How often should you replace a muffler?

[Tikvah]

Looks like no free lunch.  I thought I could get a cheaper muffler, even if a bit louder.  But this is a strange beast. 

I just can't justify $500 + for a muffler.

[luvrbus]

Most buses are that way Dave,Sean's factory muffler for his Eagle is a hi dollar sucker,the last one I priced for the Eagle I owned with a 8v92 Jefferson said 800 bucks so I sold the bus and let Matt worry about it    

[Tikvah]

Rule of thumb Dave a muffler for a DD needs to be 2+ times the CFM of the air cleaner,Donaldson has a formula for figuring it on their web page bigger is better IMO

I haven't any idea what that means.  I'm not as edukated as some folks 
How could you possibly know the CFM of the air cleaner?

Anyway, Tom posted a M120131 Donaldson MUFFLER that shows on Ebay for $181.81 + shipping.  There are specs for CFM but I wouldn't know where to start.

Dave

[luvrbus]

Just trying to help you Dave, sorry carry on with what you are doing 

[eagle19952]

I haven't any idea what that means.  I'm not as edukated as some folks  
How could you possibly know the CFM of the air cleaner?

Anyway, Tom posted a M120131 Donaldson MUFFLER that shows on Ebay for $181.81 + shipping.  There are specs for CFM but I wouldn't know where to start.

Dave

LOOK HERE   it's actually a little more than double....more is better... on both ends

http://www.asia.donaldson.com/en/exhaust/support/datalibrary/1053747.pdf

8V-71n............
.........................CFM........................CFM
RPM........HP.......IN Flow.....Temp....EX FLOW
1800 ...... 233......753........ 850 .......1827
2300 ...... 314......954........ 850 .......2314
2100 ...... 304......874... .....850 .......2120

[Seangie]

Cliff - we all know Jefferson is proud (real proud) of their parts.  I always ask them first (cause they have it) and divide by two to figure what I should be paying for it.

I think I like the glasspacks.  Simple and easy.  Maybe Ill split my 5" to dual 3.5s side by side.  Would sound nice and plenty of airflow.  60 bucks a piece for one.

Now if I can just find a 5" to dual 3.5" pipe.

-Sean

[Oonrahnjay]

Cliff - we all know Jefferson is proud (real proud) of their parts.  I always ask them first (cause they have it) and divide by two to figure what I should be paying for it.

I think I like the glasspacks.  Simple and easy.  Maybe Ill split my 5" to dual 3.5s side by side.  Would sound nice and plenty of airflow.  60 bucks a piece for one.

Now if I can just find a 5" to dual 3.5" pipe.

-Sean

     Hey, Sean - how about a plain "Y" and then 5-to-3 1/2 reducers on each side? 

http://www.truckpipestore.com/all-5-pipe-types

[RoyJ]

I think I like the glasspacks.  Simple and easy.  Maybe Ill split my 5" to dual 3.5s side by side.  Would sound nice and plenty of airflow.  60 bucks a piece for one.

Now if I can just find a 5" to dual 3.5" pipe.

-Sean

Why not look into 5" diesel "performance" mufflers? Like these:

http://flowmonster.com/i-6682698-fm2774-flowmonster-stainless-muffler-diesel-trucks-5-center-center.html

I find "consumer" diesel exhaust to be much cheaper than pro stuff like Donaldson, and work well enough for most of our applications.

[Oonrahnjay]

Why not look into 5" diesel "performance" mufflers? Like these:

http://flowmonster.com/i-6682698-fm2774-flowmonster-stainless-muffler-diesel-trucks-5-center-center.html

I find "consumer" diesel exhaust to be much cheaper than pro stuff like Donaldson, and work well enough for most of our applications.

    I like that -- I was also thinking (for Sean's application) that if I were going to do a Y connector, I'd look at going bigger than 3 1/2 inch on each branch.  There is a 4" muffler (about $100 each) right on that same page.

[Seangie]

Why not look into 5" diesel "performance" mufflers? Like these:

http://flowmonster.com/i-6682698-fm2774-flowmonster-stainless-muffler-diesel-trucks-5-center-center.html

I find "consumer" diesel exhaust to be much cheaper than pro stuff like Donaldson, and work well enough for most of our applications.

Roy - Thanks!  I could not find a 5" glasspack.  Thats exactly what I need. I'll do dually exhaust on the next bus.

-Sean

[ArtGill]

I had to replace the muffler on my NJT Model 20.  My truck parts dealer has a source for semi custom mufflers for about $350.00.  By the way, I think they built the bus around the muffler.  Art

[luvrbus]

Sean check the Aero I have used those before a good product

[Seangie]

Clifford -

Thanks.  Just checked them.  I might go with this one . . .
http://www.aeroexhaust.com/mufflers/aero-exhaust-at5050xl-diesel-muffler.html

-Sean