tips for packing muffler

Discussion in 'The Garage' started by kubiak, Apr 12, 2013.

  1. kubiak

    kubiak Long timer

    Joined:
    Nov 25, 2007
    Oddometer:
    4,837
    Location:
    madera california
    i been packing mufflers on my bikes for about 35 years or so and never had much problems with blowing out packing very much till now. i know its probably the muffler design of the supertrapp superlight muffler i have but any good tips on how to prolong the packing? i even used steel wool for the first few rounds of wrap then fmf 4stroke packing over that. fmf pillow pink stuff blows out really fast too.
    #1
  2. kubiak

    kubiak Long timer

    Joined:
    Nov 25, 2007
    Oddometer:
    4,837
    Location:
    madera california
    anyone use all steelwool for packing?
    #2
  3. joexr

    joexr Banned

    Joined:
    Jan 4, 2011
    Oddometer:
    5,022
    Tried it years ago. Had a Maico 490 that would just pulverise the packing in no time. I packed the steel wool in with a piece of wood and a mallet. Still did'nt last. Went to a solid tube. LOUD , but everything likes some backpressure to some extent. I think the pink FMF spaghetti looking stuff is supposed to be good.
    #3
  4. kubiak

    kubiak Long timer

    Joined:
    Nov 25, 2007
    Oddometer:
    4,837
    Location:
    madera california
    so the steel wool lasted longer than fiberglass?
    #4
  5. joexr

    joexr Banned

    Joined:
    Jan 4, 2011
    Oddometer:
    5,022
    It lasted a little longer than the fluffy wool stuff , but not much. Big pistons just pound the packing to death. The original stuff in my FMF Titanium-4 has held up well , but I don't know which of their replacements it might be. It's pretty dense and you can slide it in and out like a firm fiberglass tube.
    #5
  6. kubiak

    kubiak Long timer

    Joined:
    Nov 25, 2007
    Oddometer:
    4,837
    Location:
    madera california
    thanks, yea the stock stuff that come in some of the aftermarket mufflers are pretty good.
    #6
  7. freax

    freax Adventurer

    Joined:
    Apr 6, 2013
    Oddometer:
    72
    Location:
    NSW, Australia
    Ever thought of putting some steel mesh/gauze in the back of the muffler to keep the packing in?
    #7
  8. PeterW

    PeterW Long timer

    Joined:
    Nov 11, 2005
    Oddometer:
    3,215
    Location:
    Gold Coast
    I've used stainless steel wool. Actually industrial stainless steel scourers. Normal steel wool just burns nicely.

    Works O.K., but you really want a layer of fibreglass mat around the outside to keep the surface temps sane.

    You need to pack them really tight and it'll be louder than glass - the good news, cheap enough and easy to handle at least.

    Pete
    #8
  9. kubiak

    kubiak Long timer

    Joined:
    Nov 25, 2007
    Oddometer:
    4,837
    Location:
    madera california
    no havent tried that yet but i did put a lot of steelwool in the back to try to keep the fiberglass from blowing out too fast. the fiberglass packing is ok but i notice when i get a little gap in the rear from some packing being blown out the muffler sounds different and doesnt have the nice fresh sound anymore. i can go about 3 or 4 hundred miles and i can tell the difference already. i know just ride! but still looking for a good solution.:evil
    #9
  10. kubiak

    kubiak Long timer

    Joined:
    Nov 25, 2007
    Oddometer:
    4,837
    Location:
    madera california
    thanks pete, good info!
    #10
  11. redprimo

    redprimo Been here awhile

    Joined:
    Jul 9, 2011
    Oddometer:
    644
    Location:
    central coast of California
    Ive never packed a muffler unless the stinger on my old baja bug counts. Could some of you guys that do this post some pics. I will be making an exhaust system that will include a muffler and could really use some visual aids.
    #11
  12. kubiak

    kubiak Long timer

    Joined:
    Nov 25, 2007
    Oddometer:
    4,837
    Location:
    madera california
    i dont have any pics working on a repack but someones got to have some pics?
    #12
  13. ttpete

    ttpete Rectum Non Bustibus

    Joined:
    May 13, 2009
    Oddometer:
    6,771
    Location:
    Dearborn, MI
    Stainless commercial grade pot scrubbers are convenient because they are rolled up like a doughnut. Just slip the center hole over the core and stack them up.

    Another more costly solution is Fiberfrax, which is wool made from a refractory mineral. It won't burn out or melt and should be packed as tightly as possible.
    #13
  14. joexr

    joexr Banned

    Joined:
    Jan 4, 2011
    Oddometer:
    5,022
    FMF has a repack video. Or used to.
    #14
  15. Bogfarth

    Bogfarth Fridge Magnet Safety Tester

    Joined:
    Dec 26, 2011
    Oddometer:
    218
    Location:
    The Northwet
    Vance & Hines Cruzer pipes use sheets of what looks like dryer lint as baffle packing. This is not only $20 a year that blows out the pipes, but that dryer lint doesn't "baffle" anything worth a squat. Stove rope, however, is woven fiberglass rope impregnated with graphite good to 1,000ยบ F. Instead of wrapping the V&H baffle, I wrapped a set of Smart Partz add-on baffles with 5/8" flat stove rope. Funny thing, the bike is quieter and the stove rope doesn't really wear out. It did stretch some in the first 20-odd miles; my fault for not wrapping 'em tightly enough.

    I don't have a clue how you'd get stove rope to work on a Supertrap, but it might work! The seven-foot length of 5/8" rope I bought was at Ace Hardware for $5.
    #15
  16. Plaka

    Plaka Brevis illi vita est

    Joined:
    Jun 19, 2010
    Oddometer:
    4,625
    I used to use the stainless scrubby pads, supermarket grade. Copper in a pinch. Worked well, needed shaking the soot off every so often but lasted forever. Not the quietest.
    #16