FYI FORD - MustangSteve's Ford Mustang Forum
The Internet's Most Knowledgeable Classic Mustang Information
IF YOU HAVE A QUESTION ABOUT CLASSIC FORD MUSTANGS, YOU HAVE COME TO THE RIGHT PLACE!
MustangSteve has over 30 years of Mustang experience, having owned 30 of them and restored several others. With the help of other Mustangers, this site is dedicated to helping anyone wanting to restore or modify their Mustang.... THERE ARE NO DUMB QUESTIONS!!!!!
Visit MustangSteve's web site to view some of my work and find details for:
FYIFORD Contributors' PICTURES - Power Brake Retrofit Kits for 65-66 Stangs - Classic Mustang FAQ's by MustangSteve - How to wire in a Duraspark Ignition - Mustang Ride Height Pictures and Descriptions - Steel Bushings to fit Granada Spindles to Mustang Tie Rods - Visit my EBAY store MustangSteve Performance - How to Install Granada Disc Brakes MustangSteve's Disc Brake Swap Page - FYIFORD Acronyms for guide to all the acronyms used on this page - FYIFORD Important information and upcoming events

You are not logged in. Would you like to login or register?

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Any one have a fix for resonance harmonics in your exhaust??

    • 1 2  Jump to

       

    8/10/2013 7:33 PM  #26

    Tubo
    2008 BASH V Host

    Offline

    From: Ft. Walton Beach, Florida
    Registered: 4/01/2013
    Posts: 1,841

    Re: Any one have a fix for resonance harmonics in your exhaust??

    I'm installing "quarter wave attenuators". Both 2+2 and Vert drone
    I think "H" and "X" pipes while adding to performance, definately are a source for tuning both exhaust pipes to a common harmonic/drone.
    Which in my two cases are going to be are going to be 22 inches long w/90d bend close to the entrance.
    One for each side, now I just need to determine if they can be installed before the mufflers.

    If it ain't broke, I haven't modified it Yet
     

    8/10/2013 9:14 PM  #27

    MS
    Forum Originator

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,277

    Re: Any one have a fix for resonance harmonics in your exhaust??

    I wonder why my flowmaster 50's did not produce any drone?  351W, with long headers, 2-1/2" to the mufflers and 2-1/4" tailpipes.  Is there something special about a flowmaster 50?

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    8/26/2013 9:21 PM  #28

    Daze
    Forum Moderator & Bash host 2011

    Offline

    From: Kalispell MT
    Registered: 1/24/2013
    Posts: 1,130

    Re: Any one have a fix for resonance harmonics in your exhaust??

    Drone is getting less noticeable.  I have put about 300 miles on the engine and exhaust and Its getting better. I unintentionally had the carburetor set ever so slightly rich so I am sure some carbon has added mass.  I also know the sound of mufflers will change with use.  Still drones a little at 2000 but the sound does not amplify and build like it did before if I stay at that RPM. 

    If it isn't broken...modify it anyway! http://www.DazeCars.com https://galaxieforum.boardhost.com
       •Thread Starter
     

    8/27/2013 8:11 AM  #29

    MS
    Forum Originator

    Offline

    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,277

    Re: Any one have a fix for resonance harmonics in your exhaust??

    Idea... Just for test purposes...  If mass of the pipe will affect resonance, as surely it will, try using a couple of large radiator hose clamps and clamp a length of steel bar alongside one of those straight sections and see if anything changes.  Maybe you could "tune" it by placing it in a different location.  This would be a great test and if it changes things, you have something else you could sell.  Plus it won't cost you anything, and you have a lift so it will be easy to do.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    8/27/2013 1:04 PM  #30

    6sally6
    Hyper FYIFORD ADDICT

    Offline

    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,858

    Re: Any one have a fix for resonance harmonics in your exhaust??

    Rudi wrote:

    This is a low cost fix.
     Get a18"x 10" inch  piece of expanded metal, the kind that is used for plastering over and roll it up over a broom stick. You will end up with with a rolled mesh tube that you can stuff into one of the mufflers.
    This works, I have done it on my 05 Mustang to cure the drone.
     There is virtually no back pressure but it seems to change the resonance point.
     

    I like THAT for a quick'n-easy "let's see if THIS works" idea!
    6s6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    8/27/2013 1:34 PM  #31

    Rudi
    Senior 24-7 FYI Addict

    Offline

    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,976

    Re: Any one have a fix for resonance harmonics in your exhaust??

    6sally6 wrote:

    Rudi wrote:

    This is a low cost fix.
     Get a18"x 10" inch  piece of expanded metal, the kind that is used for plastering over and roll it up over a broom stick. You will end up with with a rolled mesh tube that you can stuff into one of the mufflers.
    This works, I have done it on my 05 Mustang to cure the drone.
     There is virtually no back pressure but it seems to change the resonance point.
     

    I like THAT for a quick'n-easy "let's see if THIS works" idea!
    6s6

     
    Hey Sal,    It does work. A few guys on another Mustang web site have also had good results from "The Low Buck" fix.
    The general consensus from the guys on that other web site is that "Corsa" mufflers are the ones to get for no drone synrome, too bad they don't make  any fthat fit the old stangs.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    8/27/2013 4:42 PM  #32

    John
    FYI Addict

    Offline

    Registered: 4/01/2013
    Posts: 118

    Re: Any one have a fix for resonance harmonics in your exhaust??

    Daze wrote:

    Drone is getting less noticeable.  I have put about 300 miles on the engine and exhaust and Its getting better. I unintentionally had the carburetor set ever so slightly rich so I am sure some carbon has added mass. 

    The other possibility is that the rubber hangers are softening from use.


    MustangSteve wrote:

    Idea... Just for test purposes...  If mass of the pipe will affect resonance, as surely it will, try using a couple of large radiator hose clamps and clamp a length of steel bar alongside one of those straight sections and see if anything changes.  Maybe you could "tune" it by placing it in a different location. 

    Hey Steve, check out reply #17 on page 1...

    John

     

    8/27/2013 5:47 PM  #33

    Prof
    FYI Addict

    Offline

    From: Dallas / McKinney, TX
    Registered: 4/04/2013
    Posts: 254

    Re: Any one have a fix for resonance harmonics in your exhaust??

    Day,
    Simple...ear plugs.
    Done
     

     

    8/28/2013 1:34 PM  #34

    Tubo
    2008 BASH V Host

    Offline

    From: Ft. Walton Beach, Florida
    Registered: 4/01/2013
    Posts: 1,841

    Re: Any one have a fix for resonance harmonics in your exhaust??

    Rudi wrote:

    ......"Corsa" mufflers are the ones to get for no drone synrome, too bad they don't make any fthat fit the old stangs.

    More like Tooo Bad thry're $700.
    I got to find me some place to bend 90d into the end of a 26-28 in stick of 2" stainless pipe.

    Tubo

    If it ain't broke, I haven't modified it Yet
     

     

    1 2  Jump to

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  »  Any one have a fix for resonance harmonics in your exhaust??

    • Board footera


    REMEMBER!!! When posting a question about your Mustang or other Ford on this forum, BE SURE to tell us what it is, what year, engine, etc so we have enough information to go on.