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who has made their own glasspacks, best packing material?

Discussion in 'The Hokey Ass Message Board' started by lostforawhile, Sep 7, 2011.

  1. lostforawhile
    Joined: Mar 23, 2008
    Posts: 4,160

    lostforawhile
    Member

    I got frustrated trying to find a long lasting glasspack, I really would like a porter, but it's out of my price range at the moment, So I ended up building my own stainless steel one, all I need to do is weld up the can on the core, but I still need to find a good, long lasting packing material? the good layered stuff is expensive, so I'm looking to get some input from those who have made their own mufflers, before I buy anything. with all the work on the muffler, I don't want it to fail in a short period of time :)

    I will post some pics later, but it's dinnertime right now
     
  2. Dakota Boy
    Joined: Sep 8, 2010
    Posts: 173

    Dakota Boy
    Member
    from Racine, WI

    Motocross guys use "FMF" brand loose packing for thier silencers.

    Moose Racing sells a "sheet" type of packing that is less cantankerous to deal with than the loose packing.

    If you use the loose packing, just dont pack it too tight.

    And one other thing.... never use pink Owens-Corning house insulation!!! :D
     
  3. grey46
    Joined: Aug 31, 2008
    Posts: 166

    grey46
    Member

    Stainless steel wool ,get it off ebay cheap and lasts forever ,well almost
     
  4. Moedog07
    Joined: Apr 11, 2011
    Posts: 188

    Moedog07
    Member

    I had some New/Used glasspacks from a car I bought and sold. I cut open one end off pulled out the fiberglass and the perferated tube and repacked with Stainless Steel Wool I bought off Ebay. Put them back together, welded them up and put them on my '30 Tudor. So far so good.
    I've have Good coments on the sound.

    If I do it again I'll buy a 5 inch and a 2 1/4 sticks of pipe from the muffler shop and make my own.
     

  5. Kyron
    Joined: Dec 28, 2006
    Posts: 117

    Kyron
    Member
    from Peoria Az


    I've been using regluar yellow house inaulation for yrears with no problems, even tried the "real" stuff a few times to see if I was missing somthing ....

    This is on a 2stroke and they have lower exhst temps, not sure how it will last on a car, put its cheap. :D
     
  6. fiftyv8
    Joined: Mar 11, 2007
    Posts: 5,156

    fiftyv8
    Member
    from CO & WA

    I'd like to see a tech thread done on packing it here, so we get it right the first time.
    What do you use as far as stainless steel wool goes, fine, medium or coarse and how much do you put in and do you need to wire tie it in place etc???
     
    Last edited: Nov 16, 2011
  7. Road Runner
    Joined: Feb 7, 2007
    Posts: 1,257

    Road Runner
    Member

    Or use what muffler guys from the old days did: metal shavings, gravel, nails, etc....
    I tried all those a few years ago experimenting with muffler types, length and sounds.

    Gravel should last forever but you need to use strong hangers for the added weight...haha
     
  8. Corse steel wool is better than glass. lasts longer and in my opinion sounds better.
     
  9. mustangsix
    Joined: Mar 7, 2005
    Posts: 1,297

    mustangsix
    Member

    My brother and I made some once with the pink attic insulation and perforated tube. We used masking tape to hold it tightly to the perforated core. When you fire the engine, the tape burns off and the material fluffs up again.

    We made glasspacked turbo mufflers too. Seemed to work well and lasted a long time.

    Unless you need a custom size or shape, it's probably cheaper and easier to buy them, though.
     
  10. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,458

    Rusty O'Toole
    Member

    Instead of gravel you could use glass marbles. How did gravel work anyway? Have seen plans for a very old home electrical plant (1900) where the muffler was a pit in the ground full of rocks with the exhaust pipe stuck down the middle.
     
  11. rustyangels
    Joined: Sep 28, 2010
    Posts: 178

    rustyangels
    Member

    You can try a refractory type of material called Inswool Ceramic fiber blanket

     
  12. Gravel...? You gotta be shitting me. I'm going to try that!
     
  13. David Chandler
    Joined: Jan 27, 2007
    Posts: 1,101

    David Chandler
    Member

    How about that yellow colored water heater / pipe insulation? That is fiberglass as far as I know.
     
  14. Road Runner
    Joined: Feb 7, 2007
    Posts: 1,257

    Road Runner
    Member

    The gravel gives more of the rapping sound, especially with louvered inner cores.
     
  15. barryvanhook
    Joined: Jun 17, 2011
    Posts: 625

    barryvanhook
    ALLIANCE MEMBER
    from Mesa, AZ

    Way, way, way back I had a set of Smithy's steel packs that sounded great on a flathead ... if I'm not mistaken, they were called Hollywood mufflers, but I may be a bit confused.

    For some related pics, look at http://www.jalopyjournal.com/forum/showthread.php?t=207040
     
  16. R Frederick
    Joined: Mar 30, 2009
    Posts: 2,658

    R Frederick
    Member
    from illinois

    I went to Menards and got some copper scrubbing pads. It's a super coarse steel wool type material. I put one scrubbing pad in each pipe.
    [​IMG]
     
  17. feeeser32500
    Joined: Sep 30, 2011
    Posts: 23

    feeeser32500
    Member
    from PA

    i just made my own spirale baffle it will out last any fiberglass and sounds great
     
  18. fiftyv8
    Joined: Mar 11, 2007
    Posts: 5,156

    fiftyv8
    Member
    from CO & WA


    I'd like to see some detail on how you did it, that sounds like a good solution. What thickness material did you use etc???
     
  19. Clik
    Joined: Jul 1, 2009
    Posts: 1,888

    Clik
    Member

    I was thinking of fabing a couple of dump mufflers, depending on how my headers lay out. I was thinking of using that light weight lava rock gravel. It certainly should stand up to the heat and wouldn't weigh much at all. Some of that stuff is so light it will float.
     
  20. feeeser32500
    Joined: Sep 30, 2011
    Posts: 23

    feeeser32500
    Member
    from PA

    i dident take any pics of them when i was building them. I used 4 inch exaust tube for the out side put a 2inch exaust tube for the center and cut 16gauge sheet metal in half circles kind of like a doghnut cut in half. than spaced them on the 2 inch tube on an angle to make a spiral patern hard to explain in wrighting they do sell them for about 200 a pair. google it to see a pic they are very simple just takes somm time. the brite side they cost less than $20 in matierial
     
  21. hammeredt
    Joined: Mar 3, 2006
    Posts: 435

    hammeredt

    I just put a new exhaust on my coupe running 2.5" stainless under the car (it had 8 side pipes before). I used a perforated motorcycle baffle which I modified to fit the tubes and then used stainless steel chore boys (actually the generic version I got at my local grocery store) for baffling. I think they were about $3.00 for a pair. They worked slick. They would have been a bitch to unwind, but I found that they open like a hair scrunchie and fit right over the larger diameter end tube and shrunk tight to inner perforated tube. I used about 4 or 5 per side. The sound is really throaty. The car sounds real nasty, but not overly loud. It was a huge improvement over the side pipes that had 24" of perforated tube per pipe (x8 pipes). I can now hear the sound of the wind on my windshield and have a normal conversation in the car. The motor is a 307 SBC with Speedways TruRam manifolds and a mild cam. I got a HUGE perfomance gain out of the new set up as well. I would definitely use the stainless scrubbers again.

    Good luck

    J-
     
    Last edited: Nov 16, 2011
  22. I cut the end off condoms and slide them over a perforated tube..........the "rap" changes as the RPM increases.
     
  23. I'm all for making my own stuff-but when you can buy glass packs for under 20 bucks a piece-is it really worth it?
    Your time and running around has got to be worth something.
     
  24. feeeser32500
    Joined: Sep 30, 2011
    Posts: 23

    feeeser32500
    Member
    from PA

    thats fine if you want your car to sound like everyone elses you could also go buy a kia that would be cheaper than building a car but what fun is that
     
  25. lostforawhile
    Joined: Mar 23, 2008
    Posts: 4,160

    lostforawhile
    Member

    well I built a stainless one, I'm trying to get away from fiberglass, it sounds fine at first but burns out, I'm going to look for the stainless scrubbers, I built my entire exhaust myself out of t-304, and found a really hard to find header, so I didn't want to cheap out on the muffler, I looked into buying a cherry bomb and cutting it open, then replacing the packing, but then I gutted a couple of used aircraft mufflers for the perforated center tubes, very heavy stainless, and made the rest myself
     
  26. lostforawhile
    Joined: Mar 23, 2008
    Posts: 4,160

    lostforawhile
    Member

    This is the new muffler, Bobby Brock did these beautiful welds for me in the last picture , thanks buddy! the center tubes are recycled from an aircraft muffler. The outer shell is just steel right now, as I have to order some more stainless:rolleyes:

    [​IMG]
    [​IMG]
    splitting the two parts
    [​IMG]

    cut off
    [​IMG]
    facing parts

    [​IMG]
    [​IMG]


    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
  27. slowmobile
    Joined: Apr 21, 2011
    Posts: 13

    slowmobile
    Member
    from new york

    uhh, cherry bombs?
     
  28. lostforawhile
    Joined: Mar 23, 2008
    Posts: 4,160

    lostforawhile
    Member

    sort of, except I don't want fiberglass blowing right out, right now it's cost me a six pack for the welds, and I need to order the 15 dollars worth of stainless for the outer tube, other then that it's all made from stuff I already had, everything is stainless, or will be, except for the end caps I machined out of steel, they are so heavy that I'm not worried about them rusting through
     
  29. desotot
    Joined: Jan 29, 2008
    Posts: 1,831

    desotot
    Member

    why bother with packing, I've made a few sets of stainless mufflers, glass pack style without any packing and they sound consistantly loud which would be the life of the bomb you are driving, if you want it quiet , go buy a beamer.
     
  30. go-twichy
    Joined: Jul 22, 2010
    Posts: 1,650

    go-twichy
    BANNED

    has anyone tried ca-ca? i'm sorry. i need some sleep.
     

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