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Author Topic: Anyone make muffler with side inlet and end outlet on same end?  (Read 2051 times)
TomC
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« Reply #15 on: September 01, 2013, 07:06:27 AM »

This is the whole point both Don Fairchild and I have, the M120131 muffler is a low resistance turbo rated muffler. When I bought it, I looked inside. It only has one baffle between the two sides. I know it flows enough to facilitate up to a 460hp 3406B Caterpillar-I'm sure the Series 60 won't be any different. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
luvrbus
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« Reply #16 on: September 01, 2013, 07:59:42 AM »

With a CFM rating of 2378 MR and 2913 HR with no bends that muffler won't work on a 460 hp Cat 3406b they need 2694cfm  min the 12L series 60 require 2877 cfm min  

I see it all time people with the wrong mufflers their engine temp has gone up and the power and mileage down but we all do it different my only advice is buy the right muffler and you do that by asking the manufacture
« Last Edit: September 01, 2013, 08:03:27 AM by luvrbus » Logged

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belfert
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« Reply #17 on: September 01, 2013, 08:54:47 AM »

With a CFM rating of 2378 MR and 2913 HR with no bends that muffler won't work on a 460 hp Cat 3406b they need 2694cfm  min the 12L series 60 require 2877 cfm min  

I see it all time people with the wrong mufflers their engine temp has gone up and the power and mileage down but we all do it different my only advice is buy the right muffler and you do that by asking the manufacture

Which manufacturer?  Coach or engine?  I'm confused.  You recommended earlier to contact United Muffler about a custom muffler because it would cheaper than paying MCI $1000, and now you say to go to the manufacturer.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
wg4t50
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« Reply #18 on: September 01, 2013, 09:08:21 AM »

Back to why I prefer the resonator, 5" in & 5" out, straight pipe no restriction at all & it works great on the 8V-92 in the MCI with 2 90 elbows & band clamps  Grin
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MCI7 20+ Yrs
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WG4T CW for over 50 wpm for ever.
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luvrbus
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« Reply #19 on: September 01, 2013, 09:12:52 AM »

It's not hard to under stand ask the manufacturer of your engine or look it up for the CFM rating


 If you buy from United they will have the specs on file for the engine hp and bus and can build a muffler to that spec they are in the muffler business

 It's about the only place left to get a muffler for the drivers side on a Eagle with the indent to clear the double oil cooler on a 8v71 but do whatever flips your switch it make no difference to me
« Last Edit: September 01, 2013, 09:18:04 AM by luvrbus » Logged

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belfert
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« Reply #20 on: September 01, 2013, 09:19:45 AM »

It's not hard to under stand ask the manufacturer of your engine or look it up for the CFM rating

Your other post didn't say if you were referring to the engine manufacturer or coach manufacturer.  I figured you meant the engine manufacturer.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
RJ
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« Reply #21 on: September 01, 2013, 02:58:25 PM »

Your other post didn't say if you were referring to the engine manufacturer or coach manufacturer. 

Brian -

Clifford is often good at obfuscation!

 Grin
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RJ Long
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luvrbus
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« Reply #22 on: September 01, 2013, 03:18:19 PM »

One of the best at it RJ lol you are the only one besides my wife I ever heard use the word "obfuscation", it has it advantages sometimes I told David Glass of Walmart fame where he could go and it took him 3 days to figure out where I told him to go  Roll Eyes
« Last Edit: September 01, 2013, 03:47:51 PM by luvrbus » Logged

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TomC
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« Reply #23 on: September 01, 2013, 10:26:09 PM »

Using Donaldson's formula to figure exhaust flow for proper muffler sizing, a 14 liter engine, whether it be a Cummins N14, 14 liter Series 60 works out to be 1560cfm-the 14.6 liter Caterpillar works out to be 1627cfm. The muffler that both Don Fairchild and I (and the one I'm using in my bus) is the Donaldson 5" at the same end and part number M120131. This muffler has a cfm rating at 1" restriction of 1682cfm; at 2" restriction 2378cfm; at 3" restriction 2913cfm. According to all of Donaldson's formulas, this muffler will work just fine. It will be the muffler I'm using on my 3406B truck conversion. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
luvrbus
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« Reply #24 on: September 02, 2013, 05:52:18 AM »

Why not just use the Donaldson Chart from the book it saves all the figuring it has the intake cfm,hp ratings ,exhaust temps and flow  
Why does some Prevost use a 3300 cfm muffler(1400 bucks) with the 14L DD, but we all have a different opinions,myself I am going with the Donaldson figures from the book they list every diesel engine made

They make it easy they even figure the length,size, and bends in the systems all done for you but they could be wrong ? fwiw my 3406B manual and you have different numbers as Donaldson prints in the book "for exact requirements check with the engine manufacture" good advice

 For those looking for the formula some use this one, exhaust temp + 460 degrees X intake flow = exhaust flow, Donaldson lists all the info by engine model,rpms, exhaust temp,and hp fwiw

good luck  
« Last Edit: September 02, 2013, 06:42:44 AM by luvrbus » Logged

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dickegler
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« Reply #25 on: September 02, 2013, 07:12:05 AM »

Hi Brian, I sent you an email about your muffler.

Dick
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dick egler  atlanta, in  92 prevost/beaver conversion
belfert
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« Reply #26 on: September 04, 2013, 09:46:56 AM »

I did some research and figured this all out after calling Walker today.  My muffler is actually 12"x15" not 10"x15" as I originally thought.  I found a different Walker muffler number 21084 that is the same dimensions as the 21070 except 12" instead of 10".  The problem is Walker has discontinued the 21084.

The interesting thing is I searched for Walker 21084 on Ebay and found a Nelson 86757M that crosses to the the Walker 21084.  Also, the Ebay listing says it crosses to a UNIVERSAL COACH PARTS™ 394202247 which is the MCI part number for the Dina muffler.  It looks like I found the exact replacement muffler for about 40% of what MCI wants for it.  I'm not sure if Nelson is going to discontinue this like Walker did.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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