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1970-71 Exhaust Question Asap Please.

Discussion in 'Early Jeep Restoration and Research' started by Rubicloak, Mar 1, 2022.

  1. Mar 1, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Hey everyone. Information needed as fast as possible...

    The exhaust on my 1 owner 71 is still intact from the factory (second and third pic below). However the last (guessing) 4 inches or so rusted off. Jon (owner) of Waldron's Exhaust, wants me to send him this (my original 12/70 pn 988387 muffler and tailpipe) so that they can add this to their list of original exhaust reproductions. As some of you might know, the early exhaust (66-69) is already reproduced by them, but there is nothing for the 70-71's from the muffler back.
    What I need to know is this. Does/did the tailpipe after the frame mount hanger turn down slightly or did it stay level. The Service manual (see first pic) shows it looking down from above but does not show a side view. In the second and third picture below you can see where the last little bit of the tailpipe has rusted off. I need to know if anyone still has an original they can take a side pic of, or knows/remembers what it did aft of the frame hanger. I also need to know how far it terminates from the rear cross member.

    1970_71 Exhaust.jpg
    1971 original factory exhaust.jpg
    20220215_171335.jpg
     
    Last edited: Mar 2, 2022
  2. Mar 2, 2022
    homersdog

    homersdog Tulsa, Ok 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Rubicloak likes this.
  3. Mar 2, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    ^^^Great minds think alike. Thank you. I thought the same thing and went through all of mine (I have the original brochures). Unfortunately no pics even come close to showing the rear
     
    Last edited: Mar 2, 2022
  4. Mar 2, 2022
    Cj5dale

    Cj5dale Member 2022 Sponsor

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    I have no clue if this is stock or not but this is a pic of the one on my ‘70 CJ5

    upload_2022-3-2_11-56-18.jpeg
     
  5. Mar 2, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Thank you, judging by the bend at the left and the condition of the metal and the tip, it would appear to have been replaced at some point in its life. It also looks to be a larger diameter than 1.75"
     
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  6. Mar 2, 2022
    homersdog

    homersdog Tulsa, Ok 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    If it was mine, I would keep it as high as possible and exit towards the side, not the rear. If there is no documentation to show otherwise then who is to say you are wrong?
     
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  7. Mar 2, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Good point. However I am doing a museum restoration. This piece will be reproduced by Waldrons for everyone else to enjoy as a legitimate factory correct replacement.

    Personally I think that it stayed horizontal with the slight bend to the drivers side as in the factory parts drawing above. I remember from my old 70 purchased new that it did not stick out past the side of the body, nor did it go out past the rear cross member. I just cannot remember how close to rear it terminated or if it had a slight decline.

    Having said that, I am just trying to get this 100% accurate for those that come after me wanting a factory exhaust.
     
    Last edited: Mar 2, 2022
    givemethewillys and homersdog like this.
  8. Mar 2, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Simply put, I am looking for this answer

    exhaust 71.jpg
     
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  9. Mar 2, 2022
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

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    The second last time I had an exhaust system made up at a muffler shop they had a reference book that listed the lengths & bend angles to make up exhaust pipes to factory specs, might be worth checking around to see if you can find one of these.

    In the meantime here's a bit better pic from a '72 parts manual

    upload_2022-3-2_19-44-28.png
     
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  10. Mar 2, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Thank you Howard. The bends and exit are slightly different for the commando's (87)
    I will start asking/calling some of the old exhaust places and see if they still have the old specs lying around.
     
  11. Mar 2, 2022
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

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    My Bad :oops:

    Try this one instead-

    upload_2022-3-2_22-40-32.png
     
  12. Mar 2, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Sorry Howard, I guess I am not following you on providing diagrams from the parts manual. The parts manual diagram you posted above is the same for both R2 and R3 (I jump back and forth between them both daily). They do not show definitely whether or not it stays level or declines after the bend as it is a cutoff view at the hanger portion of the tailpipe. I wish that the Service manual had provided a side view like it did for "early" 66-69 so that any drop would be seen. For whatever reason, Jeep decided a view from above was all that was needed. I hope this response does not come across as snarky (not meant to). I do appreciate your interest in trying to help find the answer as this will benefit everyone in the end.
     
  13. Mar 2, 2022
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

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    No worries. I still recommend looking for a pipe bender data book; apparently "Huth" published a set of cards listing the bend data for replicating stock pipes, if you can find an old-timey muffler shop you might get lucky. Bend-Pak also published data as well but it may only be in electronic form to be fed directly into a modern bender.
     
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  14. Mar 2, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Thank you Howard. Will start asking around and see if anyone has those books/cards
     
  15. Mar 3, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Great news. The definitive answer is B&C

    Not satisfied with my search, I figured I would pull the tailpipe out and give it a thorough inspection at the bend point.

    There was enough meat/good pipe left to give me a definitive answer.

    Upon closer inspection, I was able to verify that the tailpipe after the hanger only has one die mark which gives it the angle to move slightly away from the frame, however, the pipe was slightly rolled so that the single bend served two purposes. Move it away from the frame and give it a slight downward angle.

    So now we know that it both kicked away from the frame towards driver (as shown in top view from Service Manual) and had a slight downward angle as well.

    Only question now is, how far away from the rear cross member/brace did it terminate.

    So going off of my drawing above.
     
    Last edited: Mar 4, 2022
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  16. Mar 3, 2022
    Fireball

    Fireball Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Nice you could figure it out. I spent about two fruitless hours looking for vintage or low mileage pictures that showed a verifiable original exhaust tip. No luck.

    FYI, Waldron's front y-pipe is nothing like the originals. You can see the differences in this thread: Stock V6 Exhaust Install
     
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  17. Mar 3, 2022
    maurywhurt

    maurywhurt Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Eric, Congrats on finally getting this figured out!
     
  18. Mar 3, 2022
    todd hofsaess

    todd hofsaess Member 2022 Sponsor

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    Do these help to confirm anything
     

    Attached Files:

  19. Mar 3, 2022
    Rubicloak

    Rubicloak Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Thank you Todd. Unfortunately not factory
     
  20. Mar 3, 2022
    todd hofsaess

    todd hofsaess Member 2022 Sponsor

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    good to know
     
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