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#2299135 - 05/04/17 06:31 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
feets Offline
Senior Management

Registered: 01/20/03
Posts: 26728
Loc: Irving, TX
Originally Posted By 4mulaS
Is this achieved by increasing back pressure? I never knew that it was the resonance in the pipe that caused the drone, always thought it was the muffler?. I'm just the kind of guy who really likes to know what's going on before I spend cash.. (Read cheap! Lol)



Let's think about that for a moment.

Your muffler uses deflectors to bounce the exhaust gasses and their accompanying sound waves in one or more chambers. The pulses bounce and bobble around just enough to attenuate the unpleasant frequencies.

Resonators open up more paths for bouncing sound waves to follow. That attenuates more of the unpleasant frequencies.

Due to the shape of the glass packs the exhaust flows straight through with little interruption while the sound waves get trapped in the packing.

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#2299141 - 05/04/17 06:49 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
BSB67 Offline
master

Registered: 02/19/05
Posts: 3330
Loc: Prospect, PA
Originally Posted By 4mulaS
Originally Posted By BSB67


Headers or exhaust manifolds?


Manifolds


Okay. Ive done the manifold thing quite a bit. I have not tried the cherry bomb/resonator after the axle so I cannot speak to it other than anyone I know that has tried it says it works.

Here is what has worked for me: a factory type full length replacement muffler. That's it

I have used the Dyno Max Super Turbo in both the 747's and 748's sizes. Initially, there was almost no drone, but soon after the drone starts and builds as they age.

Also, your gear and car weight will either make it better or worse, relatively speaking. More gear and less weight, less drone. Similar system on my light weight 383/4 spd/3.91 gear car had considerably less drone than on my heavy weight /3.23 gear auto car.

Good luck



Edited by BSB67 (05/04/17 06:52 PM)
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#2299176 - 05/04/17 07:43 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
4mulaS Offline
super stock

Registered: 01/18/06
Posts: 798
Loc: Alberta
Feets , I could buy this logic and may try it, however great lengths were followed to restor it to pretty much OE correct with the cam, gear ratio, and exhaust essentially being the only deviations. I may just cave and do an oem style muffler to retain more of its 'authenticity'

BSB67. I think I'm leaning towards this (your recommendation) solution. My car is a non A/C post 69 runner, so what ever they weigh, I think 3300lbs?? With 3.91 gears and 4 spd. It is loudest or the most drone is between 1750-2000 rpm.

What mufflers have you used that represent a 'stock' solution, Accurate? Or other?
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#2299179 - 05/04/17 07:54 PM Re: Muffler drone, Please recommend for ones that dont! [Re: R/T1968R/T]
Skeptic Offline
master

Registered: 01/20/03
Posts: 4157
Loc: The Pale Blue Dot
Originally Posted By R/T1968R/T
KEEP THE MUFFLERS, GET A NEW WIFE!! blah

Mufflers are a lot cheaper. tonguue
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#2299187 - 05/04/17 08:07 PM Re: Muffler drone, Please recommend for ones that dont! [Re: Skeptic]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 32509
Loc: Lincoln Nebraska
Quote:
Mufflers are a lot cheaper.
Ding ding ding I do believe we have a winna.
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#2299245 - 05/04/17 09:25 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
BSB67 Offline
master

Registered: 02/19/05
Posts: 3330
Loc: Prospect, PA
Originally Posted By 4mulaS
'
BSB67. I think I'm leaning towards this (your recommendation) solution. My car is a non A/C post 69 runner, so what ever they weigh, I think 3300lbs?? With 3.91 gears and 4 spd. It is loudest or the most drone is between 1750-2000 rpm.

What mufflers have you used that represent a 'stock' solution, Accurate? Or other?


I call it 1800 to 2100, but basically the same. I'm a bit surprised that this is a problem in your car. Not that it does not exist, but would be minimal because you can effectively drive around it or through it before it is annoying. The gear and 4 speed give you a lot of load/rpm flexibility.

I don't have part numbers. Both times there were aftermarket replacement mufflers. Once was Midas, the other was Walker brand from my friends muffler shop.
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500" NA, Eddy head, pump gas, exhaust manifold with 2 1/2 exhaust with tailpipes 4150 lbs with driver, 3.23 gear, stock converter 11.68 @ 120.2 mph

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#2299303 - 05/04/17 11:02 PM Re: Muffler drone, Please recommend for ones that dont! [Re: BSB67]
4mulaS Offline
super stock

Registered: 01/18/06
Posts: 798
Loc: Alberta
You are absolutely right in the I do have the liberty to just choose a different gear, but this usually just tends to leave my driving around in a gear low for the situation revving higher than what is necessary and burning more premium fuel, lol
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#2299351 - 05/05/17 01:27 AM Re: Muffler drone, Please recommend for ones that dont! [Re: 451Mopar]
451Mopar Offline
master

Registered: 05/19/08
Posts: 4787
Loc: Aurora, Colorado
Originally Posted By 451Mopar
I put Walker quiet flow SS mufflers on the convertible.

Walker 22154 Quiet-Flow Stainless Steel Muffler, but it really was too long to fit well (29").

The Walker #21498 quiet flow SS (fits a 2004-2006 Chrysler Pacifica) show s to be 2-1/2" in/out, and just $64 from summit racing, just have to cut off the welded on muffler hangers. These are smaller 13" long case mufflers 20" tip to tip. Says they are a turbo style muffler.

Looks like the outlet tube may be angle cut for the exhaust exit? It could be cut straight and swedged to connect to the tial pipes?



Found a picture of the 22154s on the convertible, these are long..


Attachments
Walker Quiet Flow SS.jpg



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#2299371 - 05/05/17 04:29 AM Re: Muffler drone, Please recommend for ones that dont! [Re: 451Mopar]
4mulaS Offline
super stock

Registered: 01/18/06
Posts: 798
Loc: Alberta
Originally Posted By 451Mopar
Originally Posted By 451Mopar
I put Walker quiet flow SS mufflers on the convertible.

Walker 22154 Quiet-Flow Stainless Steel Muffler, but it really was too long to fit well (29").

The Walker #21498 quiet flow SS (fits a 2004-2006 Chrysler Pacifica) show s to be 2-1/2" in/out, and just $64 from summit racing, just have to cut off the welded on muffler hangers. These are smaller 13" long case mufflers 20" tip to tip. Says they are a turbo style muffler.

Looks like the outlet tube may be angle cut for the exhaust exit? It could be cut straight and swedged to connect to the tial pipes?



Found a picture of the 22154s on the convertible, these are long..


Thanks for posting the picture. Those are big...
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#2299463 - 05/05/17 09:56 AM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
451Mopar Offline
master

Registered: 05/19/08
Posts: 4787
Loc: Aurora, Colorado
I welded collector flanges at the muffler outlets so I can drop the entire section from header to tail pipes.

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#2299555 - 05/05/17 12:41 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
HotRodDave Offline
master

Registered: 01/29/05
Posts: 9416
Loc: Kalispell Mt.
You got an X pipe on it? Made a big difference on my dakota, helps more than adding two dynomax muflers after the 2 magnaflows did.
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#2299736 - 05/05/17 06:59 PM Re: Muffler drone, Please recommend for ones that dont! [Re: HotRodDave]
4mulaS Offline
super stock

Registered: 01/18/06
Posts: 798
Loc: Alberta
Originally Posted By HotRodDave
You got an X pipe on it? Made a big difference on my dakota, helps more than adding two dynomax muflers after the 2 magnaflows did.


It Has an H pipe....
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66Scar

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#2300383 - 05/06/17 09:09 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 451Mopar]
Sunroofcuda Offline
master

Registered: 01/20/03
Posts: 6008
Loc: Highland, MI.
Originally Posted By 451Mopar
Originally Posted By 451Mopar
I put Walker quiet flow SS mufflers on the convertible.

Walker 22154 Quiet-Flow Stainless Steel Muffler, but it really was too long to fit well (29").

The Walker #21498 quiet flow SS (fits a 2004-2006 Chrysler Pacifica) show s to be 2-1/2" in/out, and just $64 from summit racing, just have to cut off the welded on muffler hangers. These are smaller 13" long case mufflers 20" tip to tip. Says they are a turbo style muffler.

Looks like the outlet tube may be angle cut for the exhaust exit? It could be cut straight and swedged to connect to the tial pipes?



Found a picture of the 22154s on the convertible, these are long..


I'm trying to get a print of those mufflers from a buddy. I'm guessing they have 2" internal flow tubes.
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#2300598 - 05/07/17 09:31 AM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
SomeCarGuy Offline
master

Registered: 02/02/03
Posts: 8145
Loc: Someplace you aren't
Originally Posted By 4mulaS
Feets , I could buy this logic and may try it, however great lengths were followed to restor it to pretty much OE correct with the cam, gear ratio, and exhaust essentially being the only deviations. I may just cave and do an oem style muffler to retain more of its 'authenticity'

BSB67. I think I'm leaning towards this (your recommendation) solution. My car is a non A/C post 69 runner, so what ever they weigh, I think 3300lbs?? With 3.91 gears and 4 spd. It is loudest or the most drone is between 1750-2000 rpm.

What mufflers have you used that represent a 'stock' solution, Accurate? Or other?


That car weighs about 3600 pounds in stockish form. More if you have manifolds, buckets, stock iron intake.
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#2300607 - 05/07/17 09:49 AM Re: Muffler drone, Please recommend for ones that dont! [Re: SomeCarGuy]
4mulaS Offline
super stock

Registered: 01/18/06
Posts: 798
Loc: Alberta
Originally Posted By SomeCarGuy
That car weighs about 3600 pounds in stockish form. More if you have manifolds, buckets, stock iron intake.


I never knew but looked it up and most sources say 3435 lbs..

But the post is more about finding a quieter muffler.
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66Scar

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#2300843 - 05/07/17 06:43 PM Re: Muffler drone, Please recommend for ones that dont! [Re: Sunroofcuda]
451Mopar Offline
master

Registered: 05/19/08
Posts: 4787
Loc: Aurora, Colorado
Originally Posted By Sunroofcuda
Originally Posted By 451Mopar
Originally Posted By 451Mopar
I put Walker quiet flow SS mufflers on the convertible.

Walker 22154 Quiet-Flow Stainless Steel Muffler, but it really was too long to fit well (29").

The Walker #21498 quiet flow SS (fits a 2004-2006 Chrysler Pacifica) show s to be 2-1/2" in/out, and just $64 from summit racing, just have to cut off the welded on muffler hangers. These are smaller 13" long case mufflers 20" tip to tip. Says they are a turbo style muffler.

Looks like the outlet tube may be angle cut for the exhaust exit? It could be cut straight and swedged to connect to the tial pipes?



Found a picture of the 22154s on the convertible, these are long..


I'm trying to get a print of those mufflers from a buddy. I'm guessing they have 2" internal flow tubes.


When I google the 22154, I don't see anyone carrying it anymore? Maybe it got discontinued? Internally, it might me 2-1/4"? I do think it is larger than 2", and I can still hear the exhaust. I'll have to get a video with sound for these mufflers. Last video of the car was with the Super turbo mufflers that came with the TTI exhaust.

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#2301172 - 05/08/17 12:26 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
DusterTim Offline
member

Registered: 11/19/04
Posts: 183
Loc: Sterling Heights,Michigan
I had drone on my 73' Duster 340 using Flowmaster 40's, I did some research to find the best way to get rid of the drone, I found that Dynomax VT has a flap in the muffler that opens and closes with the pressure that is applied against it. This opening and closing of the flap removes drone. This is the same process that is used in SRT Chargers and in the HellCat. I put these on the Duster and drone went away and it sounds great. http://www.jegs.com/p/Dynomax/Dynomax-VT-Mufflers/1316158/10002/-1

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#2301195 - 05/08/17 01:06 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
Criterion Offline


Registered: 01/04/15
Posts: 34
Loc: Canada
Options to try:

A) Different mufflers ~ Dynomax Super Turbo's tend to knock a lot of bass out the exhaust note because of the flow path inside of them and are easily going to be the quietest performance muffler -- perhaps the cheapest option as well. If you have to have a straight-through muffler then look to the Borla "turbos". Either way, tuck the absolute largest case muffler that you can squeeze under the car. Muffling capacity/volume is going to be your friend here.

B) Add resonators or another set of mufflers as far back as you can.

C) Change up a section of pipe by adding an extra bend. If you've got a lot of long and straight runs in your exhaust those can promote standing waves in the pipes and set up resonance.

D) Tie-in an exhaust venturi in the longest straight run of pipe that you have. Don't put it in the middle of the run though, do it at 1/3 or 2/3's the length of the pipe.

E) Keep the exhaust the way it is and add a sound deadener if the resonance is from an actual panel, i.e. trunk floor, vibrating.

F) If all else fails, add a J-bend helmholtz chamber.

I've been in the same pickle as you. I have a car that I tried 4 sets of mufflers on to no avail when it came to quelling a resonance. It got expensive, labour intensive, and was a royal piss-off. I think your best and cheapest option would be to either swap out to a Dynomax/Walker turbo muffler, or add some form of resonator as far back as possible in the stream.

Best of luck to you killing the resonance!

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#2301202 - 05/08/17 01:25 PM Re: Muffler drone, Please recommend for ones that dont! [Re: DusterTim]
denfireguy Offline
top fuel

Registered: 06/15/08
Posts: 1788
Loc: Colorado
Originally Posted By DusterTim
I had drone on my 73' Duster 340 using Flowmaster 40's, I did some research to find the best way to get rid of the drone, I found that Dynomax VT has a flap in the muffler that opens and closes with the pressure that is applied against it. This opening and closing of the flap removes drone. This is the same process that is used in SRT Chargers and in the HellCat. I put these on the Duster and drone went away and it sounds great. http://www.jegs.com/p/Dynomax/Dynomax-VT-Mufflers/1316158/10002/-1
Did the same thing on my Cuda. Works well.
Craig
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2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado

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#2301205 - 05/08/17 01:40 PM Re: Muffler drone, Please recommend for ones that dont! [Re: 4mulaS]
L.R Helbling Offline
enthusiast

Registered: 12/29/16
Posts: 380
Loc: Ottawa, Ontario
Originally Posted By 4mulaS
Well, my Road Runner which I recently re-acquired certainly has a drone loud enough to annoy my wife and it does bother me somewhat too.

Im pretty sure they are stainless flomasters right now, and I will confirm this tomorrow,

So I am looking for recommends on descent sounding mufflers with no drone.

It's currently a fresh 383, somewhat Lopey comp cam, with 2 1/2 inch exhaust to the bumper.

Please help so my wife will actually want to cruise with me


I'm very sorry to hear that your wife doesn't want to cruise with you. The reason I chimed in was because we have the same car with the same engine and cam with 2.5" exhaust. I have a H-pipe in mine. Don't know what year RR you reacquired but even if it is an earlier one, I believe I can help you out. If you're still interested in the Flow Tech Terminators, I removed all of my clamps back from the exhaust manifold flange to the tips. I welded everything including the mufflers and the tips. No resonance, no drone no hissing and no rattling when you stomp on it. I bought these mufflers in 2006 and they're still on the car.

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