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Thread: S-20 Raven Muffler Crack

  1. #21
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    Link to pictures:
    https://www.dropbox.com/sh/czpcnicyq...8HfWrSMha?dl=0

    I included pictures of the weld that was done in the Idaho backcountry. The mechanic did not have any stainless steel rod. He used mild steel rod. I wonder if I sent the muffler back to Rans if they could suitably make the mod spelled out in their recent operational alert dated July 14th and posted above. The crack is just above the gussett. Looks like the offer is preventative and not for existing cracks or welds. They did quote me $477 for a new muffler before this alert came out. I will call tomorrow and see if they can modify my existing muffler.

  2. #22
    Premium Member (Donated) Drigotti's Avatar
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    There ya go! RANS does it right!
    Dave Rigotti
    N291DR 2014
    S-6S builder

  3. #23
    Premium Member (Donated) GravityKnight's Avatar
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    Quote Originally Posted by romaja View Post
    Link to pictures:
    https://www.dropbox.com/sh/czpcnicyq...8HfWrSMha?dl=0

    I included pictures of the weld that was done in the Idaho backcountry. The mechanic did not have any stainless steel rod. He used mild steel rod. I wonder if I sent the muffler back to Rans if they could suitably make the mod spelled out in their recent operational alert dated July 14th and posted above. The crack is just above the gussett. Looks like the offer is preventative and not for existing cracks or welds. They did quote me $477 for a new muffler before this alert came out. I will call tomorrow and see if they can modify my existing muffler.
    Yea might be worth talking with them again now that the alert is out? maybe a change of tune...

    Also for what it's worth, I have welded tons of stainless pipe with mild steel, and I think it works well. It seems the stainless mixes in with the mild enough to still give some rust prevention. However, I live in a very dry climate so exhaust rusting doesn't happen as quickly/harshly as it would in a humid place. For the quick *fix* on yours having been mixed with mild steel, you can use some of this paint. It will actually hold up to the heat! I have it on my headers and it stays on well. https://shop.advanceautoparts.com/p/...B&gclsrc=aw.ds

    That is if they don't want to fix it for you. Or you could have the entire dump pipe cut off, a new stainless pipe welded on, and braced etc. But that paint is surprisingly good
    S6S 116 w/VGs|MGL/FDS
    114hp zipper912|homebuilt headers/ram-air
    75"WW STOL|22x8.50main/21x8.00nose

  4. #24
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    Quote Originally Posted by GravityKnight View Post
    Yea might be worth talking with them again now that the alert is out? maybe a change of tune...

    Also for what it's worth, I have welded tons of stainless pipe with mild steel, and I think it works well. It seems the stainless mixes in with the mild enough to still give some rust prevention. However, I live in a very dry climate so exhaust rusting doesn't happen as quickly/harshly as it would in a humid place. For the quick *fix* on yours having been mixed with mild steel, you can use some of this paint. It will actually hold up to the heat! I have it on my headers and it stays on well. https://shop.advanceautoparts.com/p/...B&gclsrc=aw.ds

    That is if they don't want to fix it for you. Or you could have the entire dump pipe cut off, a new stainless pipe welded on, and braced etc. But that paint is surprisingly good
    Thanks Gravity. I will email Rans and see what they say.

  5. #25
    Premium Member (Donated) Tailwindflyer's Avatar
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    It seems like this cracking issue is the subject of a Rans operational alert, and there is a proposed factory fix.

    Check out the Rans Designs website if you have not already.

    Cheers

    Rich
    S20 build in progress, N71NG reserved
    http://n71ng.blogspot.com

  6. #26
    Premium Member (Donated) Diablouser's Avatar
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    After seeing Jim's S-20 at the Malino breakfast last Saturday (great looking aircraft) and this thread, I pulled out my muffler and pipes to decide if to send it in for the mod. The kit was delivered October last year.

    The muffler and exhaust pipe are different from the ones in this thread. The exhaust pipe ia a 90 degree or so bend and it attaches to a welded flange on the bottom of the muffler offset a bit from the center. Not at all like Jims.
    Bruce Patton
    HP-18 1986, N5596S
    RV-6A, 1999, N596S, sold 2016
    RV-10, 2014, N996S
    Building S-20, N796S (reserved)

  7. #27
    Premium Member (Donated) s19flyer's Avatar
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    Yea you got lucky (later kits) and have the S19 FWF. Much better set up.
    Glenn
    Avid Flyer, S6ES, S19, S20 In Progress
    http://www.mykitlog.com/s19flyer
    Remember, I am not immune to mistakes!
    What works for me may not work for you.

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