Does Adding Clamps to Exhaust Pipes Reduce Muffler Droning?

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Woody500 said:
I've got some Magnaflows, and always assumed I'd need to put some resonators on it when I finally put them on. I hadn't thought of putting them there, thought in tailpipes next to leaf springs might be the place. This looks easier. Especially if you've moved springs inboard.
Do they work, George?
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Yes !!!
 
gdonovan said:
Just as an aside; something I saw in Mustang circles years ago was "dead end" resonator chambers added to exhaust systems to control certain frequencies. I'm not advocating slapping random chambers on your car but it is an option if you want to explore a known solution less traveled.

These are VERY common on late model intake systems if you have worked on anything in the last 20 years most have come across them. It will be a dead end tube or bulb in the intake tract and all it does is cancel out noise.

View attachment 1716533562
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Helmholtz Resonators, an already covered subject here. Used on late model intakes, too.
But they take up a lot more room than a plain resonator, although that drawing make them look smaller. They require correct volume to work, IIRC. That J pipe looks easy, if you have enough room, but more radiated heat to floorboards.
 
Woody500 said:
Helmholtz Resonators, an already covered subject here. Used on late model intakes, too.
But they take up a lot more room than a plain resonator, although that drawing make them look smaller. They require correct volume to work, IIRC. That J pipe looks easy, if you have enough room, but more radiated heat to floorboards.
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Which it is why it is mentioned as "an aside"
 
Woody500 said:
Your rementioning 'an aside: is an actual aside. Your mentioning it the first time is adding new info to the conversation.
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Consider the fact I have never seen it once mentioned, I don't live here.
 
I bought some Aero resonators and my shop added them right after the engine. The car sounds great when idling and sounds like my Subaru when driving (except for the engine noise). Wife is happy, so I am happy. Night and day difference. No more brain-numbing droning.

Aero Exhaust Resonator - tr225 TR Series - 2.25" Inside Diameter Necks

IMG_5834.jpeg
 
Lord Sparky said:
I recently installed 2 new MagnaFlow mufflers to my 440 1969 Dart. They are loud and drone, especially around 2000 RPM. I've read that you can add heavy-duty band clamps at random points along the exhaust pipes do help reduce droning.

Has anyone done this? Does it work? What kind, how many, and where do you place them?

Thanks!
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First I've ever heard of it. I don't see how it could, since drone comes from the resonance inside the exhaust.
 
RustyRatRod said:
First I've ever heard of it. I don't see how it could, since drone comes from the resonance inside the exhaust.
Click to expand...

I agree the symptoms and causes are not solved by heavy band clamps, but I do think there is a reason people would use the clamps. My parents have a new Durango and one of the things I noticed on the exhaust appeared to just be a large chunk of metal. I believe they are using it as a mass damper to cancel out vibration in the system. I could see vibration in the exhaust system potentially causing some amount of noise, but I'm thinking it's more likely done to save parts mechanically (like potentially shaking the substrate of a cat too much and breaking the ceramic).
 
Map63Vette said:
I agree the symptoms and causes are not solved by heavy band clamps, but I do think there is a reason people would use the clamps. My parents have a new Durango and one of the things I noticed on the exhaust appeared to just be a large chunk of metal. I believe they are using it as a mass damper to cancel out vibration in the system. I could see vibration in the exhaust system potentially causing some amount of noise, but I'm thinking it's more likely done to save parts mechanically (like potentially shaking the substrate of a cat too much and breaking the ceramic).
Click to expand...
It could be similar to putting your hand over a bell to dampen it after it rings. But what the heck do I know? LOL
 
Dynomax Ultra, still drone. No mufflers alone really get away with it. I have Walker Quiet flows on two cars, one is a stock 318, the other is a built 418, they both drone. Been busy with other things to install reasonators to see if I will be able to listen to music. One person's noise is another person's music.
 

FWIF
Back in 1999
I installed TTIs on my 367 and THEIR dual 3" all the way pipes, turndowns at the bumper, and the supplied Dynomax 3-pass mufflers. It came with an H-pipe, but I had to cut it out to install a GVod in 2004/5.
No drone either way, and quiet enough to be able to sneak home late at night. Yet when I go to work in the AM, well, my neighbor would tell me that he could sometimes hear me a mile away cruising down the hiway; yet, inside the car, the wind-noise due to hardtop and driprails is louder.
*********
In the first six years, I used to swap in a lo-compression 318 4bbl for the winter. I ran this engine sometimes with an automatic, sometimes with a 4-speed, and with the GVod in the later years. and I ran it with nearly every rear gear from 2.76 to 4.30s, so, the cruise rpm was all over the board, from under 1600 to 2800. No drone with any of it, and the sound with the 318 was much more mellow, almost musical..
***********
I am very happy with this system, even all these years later.
 
CFD244 said:
Follow up...They didn't solve my drone issue.
Click to expand...

Just buy different gears :) If its bad then perhaps the Helmholtz is the way to go.

I don't mind a little 2000 rpm drone with my TTI system and Dynomax Super Turbos. I don't spend much time there anyway.

Containing Sound

How do automotive mufflers dampen the exhaust sound? Read about the technologies that work together in your exhaust system to reduce excessive noise.
www.walkerexhaust.com www.walkerexhaust.com
 
No advice here, but there are some variables to consider. IMO changing exhaust diameter from stock(2 1/4 to 2 1/2) will make a sound change. Each engine tune is unique, so drone/tone may be different. Then the human ear....all will "hear" things differently. A drone to you may not be noticeable to the next person.
@VOETOM has probably done more research on this than everyone else combined. Our cuda with 2 1/2" may have a drone but I dont notice it.
 
MOPAROFFICIAL said:
Its the exit location 'turn downs' that do that. Mine is 3" all the way to the bumper, zero drone.
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I've been working on a set of tail pipes, and want to stick with 3", but I'm having a hard time getting anything to fit. I almost have a usable driver side tail pipe, which I also plan to put a race bullet muffler in to act as a resonator. Mini tubbed and inboarded springs doesn't leave much room for 3" pipes.
 
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