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Let's talk about exhaust drone...

Discussion in 'Peterbilt Forum' started by Hogleg, Jan 2, 2017.

Page 4 of 5
  1. Jan 4, 2017 #31
    Hammer166

    Hammer166 Crusty Information Officer

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    ~8600+' and loving it!
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    I had a '99 Sterling, on that truck they hung the mufflers underneath between the tanks and straight pipe back and up. That truck just sounded sweet, a nice rumble from the length of the straight pipe under power, and the mufflers shut up the jakes to just a nice deep growl.
     
    Hammer166, Jan 4, 2017
    Hammer166, Jan 4, 2017
    #31
    rollin coal Thanks this.
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  3. Jan 4, 2017 #32
    Hogleg

    Hogleg Medium Load Member

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    Nov 20, 2016
    Salem, Illinois
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    Nice clean underside! You get a space benefit from the sleeper. On mine I go from the turbo into a S pipe down to along side/inside the frame, then back to the end of the day cab to a 90 degree wye, then flex to the elbows on the end of the stacks. One flex is fairly long, the other is short. I don't think I have enough space to replace most of the flex with shorty mufflers but will check further when the truck gets back from our runs today. My main quandary is whether to mount a longer single muffler between the trans and the frame prior to the wye or go with twin mufflers after the wye. Riding along yesterday, the drone appeared to be coming from under my feet on the passenger side. I did not seem to get much of a sensation of rumble from behind.

    John

    PS - why am I not doing the runs. I am a retired engineer and have no CDL (yet). We started a partnership LLC with me doing maintenance/fixup (mostly been wiring), my daughter running the paperwork part (dot/mc/insurance/loads, etc) and my future son-in-law doing the driving (and wrenching). Just a little background. We are doing pretty good. We just installed a wet kit and in-cab tarp control and everything worked when we picked up an end dump trailer!
     
    Last edited: Jan 4, 2017
    Reason for edit: More info.
    Hogleg, Jan 4, 2017
    Hogleg, Jan 4, 2017
    #32
    rollin coal Thanks this.
  4. Jan 4, 2017 #33
    Hammer166

    Hammer166 Crusty Information Officer

    7,467
    27,088
    Aug 18, 2007
    ~8600+' and loving it!
    0
    If it's coming from the floorboard, check the S pipe and it's mounts/clamps, make sure it's not touching anything or leaking. It doesn't take much to make a racket under there.
     
    Hammer166, Jan 4, 2017
    Hammer166, Jan 4, 2017
    #33
    Hogleg Thanks this.
  5. Jan 4, 2017 #34
    Hogleg

    Hogleg Medium Load Member

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    Nov 20, 2016
    Salem, Illinois
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    Thanks Hammer166, will check that first.
     
    Hogleg, Jan 4, 2017
    Hogleg, Jan 4, 2017
    #34
  7. Jan 4, 2017 #35
    special-k

    special-k Road Train Member

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    Dec 27, 2008
    Southern Ontario Canada
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    Keep it simple put a single short muffler/resonator before the Y.
     
    special-k, Jan 4, 2017
    special-k, Jan 4, 2017
    #35
    Hogleg, Diesel Dave, BoxCarKidd and 1 other person Thank this.
  8. Jan 4, 2017 #36
    rollin coal

    rollin coal Road Train Member

    13,346
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    Mar 29, 2008
    TN
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    Yeah I kind of have an idea what the Pete day cab exhaust is like. I've seen those resonators like special-k mentioned. Don't know how they sound though. They're really short. Probably your best option. You can get them pretty cheap at any truck parts place.
     
    rollin coal, Jan 4, 2017
    rollin coal, Jan 4, 2017
    #36
  9. Jan 4, 2017 #37
    Ristow

    Ristow Road Train Member

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    Jun 28, 2014
    Fema Region 5
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    pretty sure windows were down for this one.

    [​IMG]

    this one i know the windows and floor vent were open,late,hot summer nite cruise. this was after the gear train grenaded and was fixed,it was quieter after that,the old gears had gotten so noisy over time i didn't notice til after they were replaced.

    [​IMG]


    [​IMG]
     
    Ristow, Jan 4, 2017
    Ristow, Jan 4, 2017
    #37
    Hogleg Thanks this.
  10. Jan 4, 2017 #38
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    Look at some other Pete's. A lot of them 90 or 45 down after turbo, flex, 90 or 45 back, 5" pipe bracket on lower cross member. Muffler can go next to that. Lots of room easy to work with and you can keep your straights.
     
    BoxCarKidd, Jan 4, 2017
    BoxCarKidd, Jan 4, 2017
    #38
    Hogleg, Diesel Dave and G13Tomcat Thank this.
  11. Jan 8, 2017 #39
    Hogleg

    Hogleg Medium Load Member

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    Nov 20, 2016
    Salem, Illinois
    0
    Took a break this weekend in 10 degree weather to look under the truck. All of the muffler clamps are directly mounted to frame hangers with metal to metal supports. We are going to take some mine belting and make some rubber supports and isolate the entire system from the frame. That should help the drone immensely. Probably going to wait until it gets a bit warmer, though...

    I think we will also lower the stacks about 6 inches so we can back it into the shop. It would be really nice to be able to close the door and fire up the torpedo heater and work on the truck there. The door is 12 ft high and still not high enough for those pretty stacks. Should have built a 14ft high shop.

    John
     
    Hogleg, Jan 8, 2017
    Hogleg, Jan 8, 2017
    #39
    G13Tomcat and Hammer166 Thank this.
  12. Jan 18, 2017 #40
    Hogleg

    Hogleg Medium Load Member

    311
    258
    Nov 20, 2016
    Salem, Illinois
    0
    Drone still winning...

    We completely isolated the exhaust using open country bushings on the stacks themselves, and rubber isolation bushings on all mounts underneath. No joy.

    Going to now install a muffler.

    John
     
    Hogleg, Jan 18, 2017
    Hogleg, Jan 18, 2017
    #40
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