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Exhaust on 225 sounds different one side to the other...

Discussion in 'Early CJ5 and CJ6 Tech' started by bcurtman, Jul 21, 2015.

  1. Jul 21, 2015
    bcurtman

    bcurtman Member

    Rosebud, MO
    Joined:
    Jan 8, 2014
    Messages:
    283
    I have the same muffler on both sides (dual exhaust) and my passenger side, cylinders 2,4,6 have a ba, ba, ba lope-sounds like it has a cam in it. it does have a cam in it-but it is a stock one. My drivers side, cylinders 1, 3, 5 has more of a plghhhh sound like making a Archie Bunker raspberry. The only obvious difference is the length of the exhaust pipe due to the drivers side having a front dump and the passenger side being rear dump. Does the "odd fire" make the even cylinders have a little lope? Anyone else have or noticed this? Its not an issue, but I notice it when driving particularly between buildings or parked vehicles.
     
    bcurtman, Jul 21, 2015
    #1
  2. Jul 21, 2015
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,349
    Basically an odd fire v6 is 3 harley engines, (potato, potato, potato) hooked together. It is one of the oddities of the motor. With headers they are loud but similar sounding, actually the only decent sounding v6 made. The rest sound like motorcycle engines.
     
    Mcruff, Jul 21, 2015
    #2
  3. Jul 21, 2015
    Keys5a

    Keys5a Sponsor

    Florida Keys
    Joined:
    Jan 23, 2014
    Messages:
    4,192
    The 225 odd-fire is basically a Buick 300 V8 with the back two cylinders lopped off, creating 225 cubic inches and the rough firing order. The engine fires the V8 firing order, but with the back two cylinders missing. This gives it the unique sound.
    -Donny
     
    Keys5a, Jul 21, 2015
    #3
  4. Jul 22, 2015
    Rralphs

    Rralphs Old Member

    Nederland, Co
    Joined:
    Dec 12, 2004
    Messages:
    270
    Not exactly true. The 300 has 4 crank journals with 90 degree separation. The 225 has 3 with 120 degree separation.
    Because the block is 90 degrees and the crank is 120 the 225 "farts in the bath tub" sound comes when both banks are heard together.
    Each bank by its self would have even pulses every 240 crank degrees (even fire or odd).

    Because of the intake manifold design. If one barrel of the carb had it its idle jet miss adjusted. It would effect 2 cylinders of one bank and only 1 on the other.
    Try tweaking your carb, then check plugs and wires. I don't think the longer pipe on one side should make it sound different.
     
    Rralphs, Jul 22, 2015
    #4
  5. Jul 22, 2015
    Tom_Hartz

    Tom_Hartz Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    North Carolina
    Joined:
    Apr 9, 2014
    Messages:
    478
    Bcurtman my Jeep sounds the same as yours. I have fender well headers with mufflers dumping out each side in front of the rear tires. My engine does have a slight cam but yes the passenger side has a bigger lope at idle.
     
    Tom_Hartz, Jul 22, 2015
    #5
    PigeonsBlood likes this.
  6. Jul 22, 2015
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
    Joined:
    Jul 18, 2013
    Messages:
    5,671
    Never new this... but I think Rralphs hit it on the head for what was an uneven exhaust sound on mine. I used to run fenderwell headers and the passenger side had more 'lope' (really more of a sputter) in it at idle. Adjustment of the idle screws (and the passenger side in particular) helped it right out - even for a novice like me it was a pretty audible difference. Of course it still had some afterward as a consequence of the design, but I would look into it. I knew I was running rich from the plugs...I wish I could remember which plugs were really fouled but I am pretty sure it was only 2 on the passenger side and then probably the 3rd one on the driver side. Always thought that was a little weird...but now maybe I have an answer.
     
    FinoCJ, Jul 22, 2015
    #6
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