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upsizing the exhaust system

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Frenzy, Apr 30, 2009.

  1. Apr 30, 2009 #1
    Frenzy

    Frenzy Medium Load Member

    331
    186
    Mar 24, 2008
    Seattle, WA
    0
    The single stack exhaust system on my 2000 Century with a C-15 is showing it's age. I had to do a temp repair to the exhaust pipe under the sleeper. As I was doing that I took a few rough measurements and it looks like from the flex pipe to the muffler I could increase the size from 5in to 7in. I would have to reduce back to 5 in for the muffler.

    I am not trying for a louder sound, just trying to pick up a few tenths on the MPG.

    Anyone been there, done that, won't go again?

    Ken
     
    Frenzy, Apr 30, 2009
    Frenzy, Apr 30, 2009
    #1
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  3. Apr 30, 2009 #2
    powernut

    powernut Bobtail Member

    15
    3
    Mar 14, 2009
    Iowa
    0
    I would be afriad that by having to reduce it back to 5" at the muffler you will lose anything that you would have gained. Might look up Grand Rock performance mufflers. They might help you and would be a lot less work.
    Mike
     
    powernut, Apr 30, 2009
    powernut, Apr 30, 2009
    #2
  4. Apr 30, 2009 #3
    Frenzy

    Frenzy Medium Load Member

    331
    186
    Mar 24, 2008
    Seattle, WA
    0
    I have looked at Grand Rock, Donaldson and Walker for mufflers. I was hoping to find a 6in inlet and outlet. Grand Rock came the closest but they strongly recommend a dual exhaust. I don't want to go to a dual, I don't want to work around that second stack doing my airlines and electrical hookup. I might try making a muffler, sort of like a cherry bomb, with the 7 in pipe.

    I have to redo the system anyway, so now is the time to be radical.

    Ken
     
    Frenzy, Apr 30, 2009
    Frenzy, Apr 30, 2009
    #3
  5. Apr 30, 2009 #4
    pullingtrucker

    pullingtrucker Road Train Member

    1,185
    598
    Dec 21, 2008
    Fostoria, Ohio
    0
    The 5in pipe is more than enough for your kitty. If you had a ACERT motor than I would consider a larger diameter pipe just because the ACERT motor moves a lot more air. Personally i would just replace the 5in pipes and install a highflow muffler like a Deisel Injection of Pittsburgh type or a Donaldson (I hear they are the same, but cheaper). Basically you want a muffler that is straight through with no baffles (kinda like a cherry bomb that you mentioned).
     
    pullingtrucker, Apr 30, 2009
    pullingtrucker, Apr 30, 2009
    #4
  7. Apr 30, 2009 #5
    TimberTaxi

    TimberTaxi Bobtail Member

    34
    7
    Dec 28, 2008
    Dallas, TX
    0
    Buy a Donaldson, then take a 4" pipe or a 4X4 post an run it through the muffler to the end with the collapsed baffle, smack it a couple of times and waa laa you have a very inexpensive straight through muffler with no baffles.
     
    TimberTaxi, Apr 30, 2009
    TimberTaxi, Apr 30, 2009
    #5
  8. Apr 30, 2009 #6
    Rock hauler

    Rock hauler Light Load Member

    264
    54
    Nov 26, 2008
    Deridder La.
    0
    Frenzy, walker(#22920) is a regular 10" muffler with 5"inlet and 5" outlet. but there is no baffles in it, you can see through it. I paid $65 for mine.
     
    Rock hauler, Apr 30, 2009
    Rock hauler, Apr 30, 2009
    #6
  9. Apr 30, 2009 #7
    Mr. Haney

    Mr. Haney Road Train Member

    2,693
    2,041
    Dec 17, 2008
    0
    Donaldson part # M100463 is what you want. This is an off road muffler that is straight through design. I've had guys take a standard muffler and knock the baffles out, use this muffler and have better flow afterwards.

    PP sells it as there high flow stack muffler
     
    Mr. Haney, Apr 30, 2009
    Mr. Haney, Apr 30, 2009
    #7
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