Author Topic: "Quiet" 4" muffler?  (Read 4116 times)

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Online Mad Max

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"Quiet" 4" muffler?
« on: March 29, 2008, 06:17:30 PM »
Folks,

I've now got two 6BT-powered rigs (the tugboat '93, and the '78 Ramcharger trail rig), and I just got a muffler from the local Kenworth dealer for the tugboat.  It is 45" long, and appears to be just right.

 

Look inside -



This muffler is from a company called ACRAFIT, and it has a wall dead center within it that forces the exhaust (and sound) to go through the perforations verse just straight through.  I cannot help but believe this will be great for noise cancellation.  Has anyone else seen such a muffler, and if so do you like the noise level, and did you notice a performance difference?
I figure the longer the muffler is the better it will perform, right?...more surface area = more perforations for cross-flow = less restriction in flow...and an increase in performance potential, ja?
I have heard of the Donaldson line but I cannot get any info on what it looks like on the inside and/or how it 'sounds'.

Now, I'm wanting to install a similar muffler on the Ramcharger, which has a lot less wheelbase to work with, so I'm looking for a similar muffler...but is about 2-3 feet long.  I may be able to get this 45" monster to fit in the RC's chassis, and if so, bonus.  This muffler was $75 bucks at my local KW shop - not a bad price, and I'll be happy to get another one just like it for the RC unless I can find one a bit shorter.

Anyone?

Mucho thanks,
- Sam
93 RC 'Cummins Sport' "Oxx"
93 Ram W350 CTD "Big Mack"
78 W-950 CTD Power Wagon "Nacho"
68 Charger R/T "Thor"
52 Willys M-38 "Poncho"

Offline s ǝoɾ

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Re: "Quiet" 4" muffler?
« Reply #1 on: April 1, 2008, 07:08:05 PM »
if quiet non straight through is what u desire how about a pair of smaller 3" tractor mufflers (they look just like that) but smaller. y it out into duals.
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Offline skyjackedRC

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Re: "Quiet" 4" muffler?
« Reply #2 on: April 6, 2008, 10:28:00 PM »
yes they are super quiet.i had straight 4in  pipe. then later added the 4 in magnaflow flow through muffler,and it was almost too quiet, couldnt even tell it was running
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Offline steved

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Re: "Quiet" 4" muffler?
« Reply #3 on: May 1, 2008, 12:33:21 PM »
Donaldson and Nelson offer several versions of that muffler...one has the baffle, the other doesn't.  I believe there is only a little difference in CFM between them.

It will either be very quiet or it will drone...I have heard of both happening with the big truck muffs...
04.5...2500...600CTD...4.10s...NV5600...Flux1s...FASS...Gulf Coast Filter...Smarty Jr...Dynatrac No-Spin.

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Offline NotEnufGarage

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Re: "Quiet" 4" muffler?
« Reply #4 on: June 5, 2008, 11:39:07 AM »
So how does that muffler sound?   Do you have a part number?

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Online Mad Max

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Re: "Quiet" 4" muffler?
« Reply #5 on: June 5, 2008, 02:27:33 PM »
After doing some research on that particular muffler I discovered it isn't the best flowing design so I took it back.  I'm going to go with this: Magnaflow #12773
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MPE%2D12773&N=700+4294922710+4294891681+4294788252+4294788220+4294783146+115&autoview=sku
I'll hopefully have the RC up and running in about 2 months so I'll know then how it sounds.  What I like about it is it's a straight-through design with internal sound deadening material (not just perforrated baffeling) and it's a 'diesel' muffler.
- M2
93 RC 'Cummins Sport' "Oxx"
93 Ram W350 CTD "Big Mack"
78 W-950 CTD Power Wagon "Nacho"
68 Charger R/T "Thor"
52 Willys M-38 "Poncho"

Offline steved

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Re: "Quiet" 4" muffler?
« Reply #6 on: June 5, 2008, 05:09:38 PM »
Donaldson - M090544

Nelson - 86131M

Nelson - M100580

Donaldson - M085171

Donaldson - M085421


I have a Magnaflow 30", 4" in/out on my truck...very mellow.
04.5...2500...600CTD...4.10s...NV5600...Flux1s...FASS...Gulf Coast Filter...Smarty Jr...Dynatrac No-Spin.

1953 M37...the project

Offline NotEnufGarage

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Re: "Quiet" 4" muffler?
« Reply #7 on: June 5, 2008, 05:14:04 PM »
After doing some research on that particular muffler I discovered it isn't the best flowing design so I took it back.  I'm going to go with this: Magnaflow #12773
http://store.summitracing.com/partdetail.asp?autofilter=1&part=MPE%2D12773&N=700+4294922710+4294891681+4294788252+4294788220+4294783146+115&autoview=sku
I'll hopefully have the RC up and running in about 2 months so I'll know then how it sounds.  What I like about it is it's a straight-through design with internal sound deadening material (not just perforrated baffeling) and it's a 'diesel' muffler.
- M2

I just did some checking and you can order that Magnaflow from Amazon.com for the same price, but no shipping/handling charge.   Not bad!
'70 Challenger, '70 Charger, '70 Daytona
'74 Duster, '79 Li'l Red
'90 W350 CTD, '93 D250 5.9L (For Sale)
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Offline s ǝoɾ

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Re: "Quiet" 4" muffler?
« Reply #8 on: June 5, 2008, 06:15:00 PM »
on a similar note, has any one seen a 4"-3" dual muffler? im finding one single magnaflow that fits the description.

something along these lines
Avoid replacing any part that you have not proven to be faulty through extensive testing.

Offline NotEnufGarage

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Re: "Quiet" 4" muffler?
« Reply #9 on: June 6, 2008, 10:07:03 AM »
I just did some checking and you can order that Magnaflow from Amazon.com for the same price, but no shipping/handling charge.   Not bad!

After looking on Amazon, I check Ebay.  I found a seller there that had them listed (with free shipping) for $115 buy it now or make offer.  I made an offer for $85 and they accepted it, so $85 shipped. 

Score!

'70 Challenger, '70 Charger, '70 Daytona
'74 Duster, '79 Li'l Red
'90 W350 CTD, '93 D250 5.9L (For Sale)
'94 BMW 740iL

Offline NotEnufGarage

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Re: "Quiet" 4" muffler?
« Reply #10 on: June 12, 2008, 10:44:26 PM »
After looking on Amazon, I check Ebay.  I found a seller there that had them listed (with free shipping) for $115 buy it now or make offer.  I made an offer for $85 and they accepted it, so $85 shipped. 

Score!

  It arrived today and looks really nice.  I also ordered a 4" cast turbo elbow, a 2nd gen 4" downpipe, and a 2nd gen 4" tailpipe which should all be here in the next couple days.  Once it all gets here (and I get the truck out of the paint booth) I'll take it to the muffler shop down the street and have them set it all up.   I'll have a complete 4" system for under $350 and it won't have 2 big 90 degree bends in it.  Might have to kink the downpipe just a tad to clear the TC, but I don't think that will hurt too much.   I'll post pics when it's done.
'70 Challenger, '70 Charger, '70 Daytona
'74 Duster, '79 Li'l Red
'90 W350 CTD, '93 D250 5.9L (For Sale)
'94 BMW 740iL

Offline FredS

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Re: "Quiet" 4" muffler?
« Reply #11 on: June 23, 2008, 05:58:25 PM »
Max, I'm running a 4 inch straight through Magnaflow, that's about 12 inches long on my RCC, and its almost too quiet. I picked it up from Rip at http://www.sourceautomotive.biz

With the 4 inch pipe and the bend around the Tcase, and the 4 inch tailpipe, I didn't have much room left for a muffler, and the 12inch Magaflow worked perfect.
Fred Swanson
Desert Diesel Parts, LLC
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Online Mad Max

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Re: "Quiet" 4" muffler?
« Reply #12 on: June 23, 2008, 11:26:03 PM »
Fred, the case is 12" long?  Wow I thought I'd need the big 30" job - maybe I can get away with the smaller unit - like you said it'd be a lot easier to mount.  Hmmmm.....
- S
93 RC 'Cummins Sport' "Oxx"
93 Ram W350 CTD "Big Mack"
78 W-950 CTD Power Wagon "Nacho"
68 Charger R/T "Thor"
52 Willys M-38 "Poncho"