Same exhaust sounds so different

Mopar Exhaust Systems

  1. GMP440

    GMP440 Active Member

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    Two things that will affect how the exhaust sounds is using spark ported vacuum vs manifold vacuum and idle mixture. I have experienced this with the 318 that is in my 68 Coronet.
     
  2. ChargerM440

    ChargerM440 Well-Known Member

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    You've got me extremely interested. Would you be able to upload a video or audio clip of the two systems?
     
  3. Ron H

    Ron H FBBO Gold Member FBBO Gold Member

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    Jumping in here to hear what the difference is between these exhaust systems. I have an X setup,headers, 3" but system is too loud for my pref.
     
  4. Don Frelier

    Don Frelier FBBO Gold Member FBBO Gold Member

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    They can sound different depending on how they are tuned as well.
    With a mild cam on the lean side it will sound docile.
    Richen it a bit and it will have more grunt.
    Tuning is very important.
     
  5. Dan64

    Dan64 Well-Known Member

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    I've never done this but i've heard that staggering the distance of the mufflers from the collectors can help eliminate or lessen drone. Has anyone here tried this?.
     
  6. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

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    Sorry bout the late reply, didn't see it till now. I used $30 mufflers from Jegs. This is my build thread, exhaust starting on post #116

    http://www.forbbodiesonly.com/moparforum/threads/taking-up-new-residence.114133/page-6
     
  7. CMCE

    CMCE Member

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    I'm not 100% sure, but I do think Ford did this on Fox-Body Mustangs at some point to help with drone.
     
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    • RJRENTON

      RJRENTON FBBO Gold Member FBBO Gold Member

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      MANDREL BENDING is a process of forming a bend in thin wall pipe or tubing that prevents distortion in the inside bend radius due to compression of the pipe's excess material (ridges or bumps) during the bending process. A MANDREL is an attachment to the bending machine that is inserted in the INSIDE of the pipe that is slightly smaller than the pipe's ID. The mandrel is positioned approximately 1/8" from the tangent point of the bend radius and is withdrawn slightly as the bend radius is formed. The pipe is first clamped to the bending die, the mandrel is inserted and as the bending die begins to rotate to the desired radius (angle). There is nothing magic with a mandrel formed bend vs non mandrel formed bend EXCEPT the mandrel formed bend is SIGNIFICANTLY more smooth (no rumpling or bumping of the inside radius of the tube's bend). The smoother the bend, the less flow restriction and quite likely, less turbulence resulting in a "nicer" or more pleasing sound.
      The X pipe vs the H pipe configuration will result in a resonant frequency difference between the two systems. The resonant frequency is generated by the exhaust gases travelling thru the pipes. Once the resonant frequency is achieved, the exhaust pulses and their associated noise pulses are cancelled OR if a multiple of the resonant frequency is generated the exhaust pulses (and noise pulses) are AMPLIFIED. Because the overall length of the system is fixed, the only variable is exhaust pulses and their frequency is changing, due to RPM change, will result in a "difference" in sound level between the X pipe vs H pipe system. Which is better?? It's a matter of personal preference and which system develops the best "seat of the pants feel and sound". Just my opinion of course.
      BOB RENTON
       
    • Cranky

      Cranky Banned Staff Member FBBO Gold Member

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      All kinds of things will make the exhaust system sound different and a good many of them have already been listed here. Even how many 'crimps' (over tight muffler clamps?) there are in the system will make a change. Years ago I saw a C3 Corvette on the rack at a buddies shop and it had a full straight system but the pipes had crimps about every 12" all the way to the tail. Didn't hear it run but my bud said it sounded pretty good so I did a short length on my V6 Dakota that already had a full straight system in it and it did make a noticeable change. Had always intended on making a die to make deeper crimps (the crimps on the Dakota were pretty shallow) and use a larger diameter pipe...
       
    • Pops1967GTX

      Pops1967GTX FBBO Gold Member FBBO Gold Member

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    • Pops1967GTX

      Pops1967GTX FBBO Gold Member FBBO Gold Member

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    • furyus

      furyus Well-Known Member

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      I'm just trying to understand why you have a 21/4 inch diameter tubing. You're probably strangling the engine.
       
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