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Exhaust size

Discussion in 'Early CJ5 and CJ6 Tech' started by jchisum, Oct 20, 2005.

  1. Oct 20, 2005
    jchisum

    jchisum New Member

    Cameron Park, CA
    Joined:
    Dec 29, 2004
    Messages:
    33
    I've been building up my G'pa's 53 3a for a long time now and it's time to consider exhaust. I've got a fresh rebuilt 225 and it's going through an np435. question is what size exhaust is anybody running/what's a good size. I could go dual or I could go bigger with crossover to single to save some room around the gas tank in back.

    ideas????
     
    jchisum, Oct 20, 2005
    #1
  2. Oct 20, 2005
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,360
    Ah, you're gonna get a can of worms here.... theoretically, you'd want to stay with smaller pipe to keep back pressure up, making more torque..... Also depends on what kind of sound you want...I personally am running fenderwell headers and Cherrybomb turbo II's and turnouts in front of the rear wheels, with 2 1/2 inch pipe.... Very free flowing, but I didn't notice any loss in low-end..... I like the sound OK, but often wish the pipes exited at the rear corners of the Jeep......
     
    Patrick, Oct 20, 2005
    #2
  3. Oct 20, 2005
    Dummy

    Dummy I kick hippies

    Escondido, CA
    Joined:
    Dec 5, 2004
    Messages:
    646
    I'll second that. I'm running fenderwell headers with 2-1/2-inch collectors into 2-1/2-inch mufflers. I had the old school $8 turbos that probably came with the headers and now have Flowmaster Hushpowers on it. The Flowmasters are really mellow and almost take the odd-fire sound out of the engine. I'm going to go pick up some regular old OEM-type quiet mufflers to replace them with. As for power, those 225s make so much low end torque and the 50lb flywheel has so much inertia it's going to take a lot to notice any loss.
     
    Dummy, Oct 20, 2005
    #3
  4. Oct 20, 2005
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,524
    I think 2" diam or smaller
    only reason would be that it's easier to make some of those tight bends and curves necc if you're going all the way back.
    mine run all the way out both corners, 2" diam, fwiw
     
    jpflat2a, Oct 20, 2005
    #4
  5. Oct 20, 2005
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,360
    Jim's sounds good with glasspacks. My Dad's has AA headers and duals all the way to the back with Dynomax muffflers side by side...
     
    Patrick, Oct 20, 2005
    #5
  6. Oct 21, 2005
    Chris Insull

    Chris Insull All roads lead me back to the beach... 2023 Sponsor 2022 Sponsor

    Chesapeake, VA.
    Joined:
    Sep 22, 2002
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    805
    Any pics available of that?
     
    Chris Insull, Oct 21, 2005
    #6
  7. Oct 21, 2005
    jchisum

    jchisum New Member

    Cameron Park, CA
    Joined:
    Dec 29, 2004
    Messages:
    33
    thanks for the feed back. I'm pretty sure I'm going all the way to the corners just a matter of 2-2.25" or cross over to one three all the way. if I can fit it I like the 2 x 2" idea....
     
    jchisum, Oct 21, 2005
    #7
  8. Oct 22, 2005
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
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    5,349
    I run Heddman fenderwell headers with 2 1/4" thrush mufflers and turnouts in front of the rear wheels, they have a nice rumble to them and tone down at cruising speed, the headers were new in 1992, no holes or leaks in them yet. I run the reuseable copper gaskets at the collectors.
     
    Mcruff, Oct 22, 2005
    #8
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