Need help locating 4" Resonator SS

[RKrueger]

I recently posted information having to do with extreme resonation and cab noise from a recently installed Banks Monster Exhaust System.

In fairness, others are having this problem, not all, and Banks has assured me they are working to resolve this completely.

While I am being patient waiting for a solution, I need to have some options other than to return the entire system for credit.

One of these is to install a properly designed and tested 4" resonator that I can add forward of the Banks muffler. ( Between the Turbo and muffler ) I am having quite a bit of difficulty finding choices. I am willing to use an Aluminized Steel version, although SS would be preferred. It seems Walker has an AS one, but I thought I would ask others if they have seen 4" resonators advertised from other vendors. .

Any help would be appreciated.

 

[HoleshotHolset]

Why not insulate the rear cab wall and floor so that the resonation stays where it should be? Even if it doesn't eliminate or reduce the drone (which I doubt will be the case... )... your truck will be a lot quieter overall.



Just a thought... .



Matt

 

[Bob Wagner]

Call Rip, free advise. Rips been in the business along time.



www.sourceautomotive.biz



503 654 9004



Rip will point you in the right direction

 

[RKrueger]

I've had the entire underbody coated with a thick waxy rustproofing, not for the rustproofing advantage, but strictly to reduce the noise level. If I put any insulators on the cab other than what's provided, I stand I high probability of accumulating rust or corrosion, or at least accelerating the process.

This is aside from my viewpoint that I shouldn't have to do this with a properly designed exhaust system, especially one that cost as much as this one did.

Banks thinks (today) that they may have an answer in the form of a redesigned muffler, which they are eventually going to send me to test. I think this is a two-step solution. Even if the muffler improves the noise issue, I think the addition of a properly designed resonator would only lessen the noise even further.

While I haven't mentioned this to Banks yet, our 700 mile trip this weekend seems to have resulted in a decrease in performance of the truck, as unlikely as that may seem. I have been doing some research on this problem and so far there is evidence that enlarging an exhaust system beyond what it needs to breath unimpeded often results in a decrease in performance.

For now, I'll await Banks' solution, but I think I may try a resonator on my own if I am not satisfied with the end result. ( In addition to the Banks redesigned muffler )

I should add that the Banks people are very concerned about this problem, and my situation, and have been extremely cooperative in finding a solution, which is exactly why I chose Banks in the first place for this purchase. I'll try their solution first. If the noise has been substantially reduced, I'll install a resonator, and if the noise level drops even further, I'll report this to Banks.





Robert

 

[RKrueger]

Bob Wagner,

Sorry, but your reply came in while I was responding to another.

I have called Rips, and their only remedy was a trial fix by another TDR member that installed two (2) Magna-Flow mufflers in series in place of the Banks unit. Too much of my money to fix somebody else's system, IMO.



Robert

 

[Hummin Cummins]

http://shop.airflowonline.com



Lotsa nice stuff here. 4" resonator, cant tell if stainless or not



Chris

 

[RKrueger]

Thanks, Chris, i sent them an inquiry.

We'll see...



Thanks,

Robert

 

[RKrueger]

Well, Chris, I had a nice -long- chat with Charlie from http://shop.airflowonline.com and although they may not be able to provide a resonator that fits my system, I sure learned a hell of a lot about muffler and resonator design.

In order to sum things up a bit, a diesel produces primarily low frequency sounds. The current principle for muffler engineering for diesels is to design a long bodied muffler because all the low-frequency sound must be removed only at the outgoing end by specially designed chamber dimensions. The farther forward you go in the muffler, the design is different to remove the higher frequency bands of the entire broadband range of sound that the engine produces. If you use a muffler, even a straight-through type that is too short, more of the low-frequency noise will escape without being muffled.

On resonators, one should ask what noise level reduction a customer can expect ( in db ) from the particular vendor.

Regardless of the efficiency of the muffler, the addition of a resonator will -always- result in a quieter system, as a resonator reduces the noise level over the entire broadband frequency. ( It doesn't target a particular frequency )

So, Charlie seems to agree that their approach to redesigning the muffler is the correct approach, if they design it correctly. He maintains that they can actually remove all the resonation and lower the entire noise level all in the muffler itself. Obviously, Banks will not want to restrict the flow too much in order to gain a lower db, but will probably shoot for an acceptable compromise. Thats why I am still searching, but have not yet found, a good quality 4" resonator.

Thats also why that the Rips customer that put two Magna-Flows back to back instead of the Banks muffler, was able to achieve a quiet system. He effectively created one big, long muffler which is exactly what Charlie said was necessary to quiet a Diesel down.

When all this stuff with Banks is finally resolved, good or bad, I'll repost and give a fair summation of the results. Charlie seems to think Banks will come through due to their excellent reputation for quality engineering. Hope so

 

[HoleshotHolset]

It makes sense... . low frequency = long wavelength... . and if the muffler is too short it can't contain/dissipate enough of the wavelength fast enough... . I betcha it would have worked on a Honda!



Just me thinking outloud... .



Matt