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Thread: Muffler replacement, reuse shroud?

  1. #1

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    Muffler replacement, reuse shroud?

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    I recently bought a '76 Super Cub and have the Atlee HD muffler. I discovered an exhaust leak and the muffler looks like its toast. It has a major hole/leak near the left end and under the shroud, by the duct going to carb heat. The shroud is buckled/separated a little with a small crack probably from the direct exhaust heat exposure. My question is whether the shroud is reusable if we can work it back into shape? If not, I may order the Hot Rod combo with new shroud. Help me spend my $$$. Photo of shroud added.

    Thanks,

    Russ
    Last edited by Russ Norwood; 03-09-2015 at 06:11 AM.

  2. #2
    aktango58's Avatar
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    sutton exhaust...
    I don't know where you've been me lad, but I see you won first Prize!

  3. #3
    Aviator's Avatar
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    Could you post a few pics? A muffler should not burn through (hole) with normal use unless the material or the workmanship was substandard to start with. A crack maybe.

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    I vote Sutton also!

  5. #5
    Steve Pierce's Avatar
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    The aluminum is soft and can probably be reformed, patched or welded.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  6. #6
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by Aviator View Post
    Could you post a few pics? A muffler should not burn through (hole) with normal use unless the material or the workmanship was substandard to start with. A crack maybe.
    BS.... thats why you need to inspect them often, they DO fail in many ways....

  7. #7
    Aviator's Avatar
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    If someone came out with a SS shroud STC, I'd buy it. It just might buy you enough time to find a good place to put her down before the fan stops - or worse – after a muffler rupture.

    Less than 30Hrs. on new muffler:

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  8. #8
    beaver18's Avatar
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    Sutton for me ,great heat and S/S shroud

  9. #9
    Steve Pierce's Avatar
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    30 hrs? How many years? Looks old and rusty and had a severe backfire. Huge difference in an original muffler and the materials they use today.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  10. #10
    skywagon8a's Avatar
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    Quote Originally Posted by Aviator View Post
    If someone came out with a SS shroud STC, I'd buy it.
    Don't know about Canada, but here I would just make one out of s/s and call it a minor alteration. Most shrouds are stainless anyway.
    N1PA

  11. #11
    moneyburner's Avatar
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    Quote Originally Posted by Aviator View Post
    If someone came out with a SS shroud STC, I'd buy it. It just might buy you enough time to find a good place to put her down before the fan stops - or worse – after a muffler rupture.

    Less than 30Hrs. on new muffler:

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    I'm curious about the failure modes here. Was there a backfire? Extreme EGT? I wouldn't imagine the shroud could handle bare exhaust - it would simply melt if the power setting is high enough, right? My thinking is that it would not be worth repairing.
    Quidquid Latine dictum sit, altum videtur

  12. #12

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    I have the hot rod muffler, makes the cub sound like a Harley. Might have helped takeoff RPM a bit did help CHT at full throttle. It is loud.
    DENNY

  13. #13
    Aviator's Avatar
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  14. #14
    Aviator's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    30 hrs? How many years? Looks old and rusty and had a severe backfire. Huge difference in an original muffler and the materials they use today.
    Sorry, Mr. Pierce and moneyburner, I don't know how old it was. No backfire reported in the info I got. Have a few more pics of the damage, but I'll have to look for them on my archives drive (if needed).
    Last edited by Aviator; 03-10-2015 at 03:24 PM.

  15. #15
    Steve Pierce's Avatar
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    Sorry but I have inspected a lot of mufflers and that looks like it has way more than 30 hours onnit. Calan Der time has an effect as well.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  16. #16
    irishfield's Avatar
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    That was definitely "blown" away, it didn't melt.

  17. #17
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    Sorry but I have inspected a lot of mufflers and that looks like it has way more than 30 hours onnit. Calan Der time has an effect as well.
    I agree... way more than 30 hours... or some BAD running engine....... misaligned stacks??

  18. #18
    Aviator's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    Sorry but I have inspected a lot of mufflers and that looks like it has way more than 30 hours onnit. Calan Der time has an effect as well.
    I'm not doubting your expertise and experience with these cans. This info is 12 years old but I can't tell you when the event took place.

  19. #19

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    Wow, shows you how bad it could have been. Mine burned up the scat duct and blasted a sleeved fuel fuel line with heat but no other apparent damage. The burning smell of the exhaust, particularly on takeoff was very noticeable. I am going to try and have the shroud repaired and spot welded. New muffler on the way. thanks for the input.

    Russ

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