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  #9  
Old 19-08-2013
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Sweet, just so happens I have a few pink batts left over from a job. Once the perforated tube turns up ill be able to make a start.

What's the best method for packing? Just wrapping around the pipe then slotting the whole lot together or just ramming it in in pieces with one end left off the muffler and just keep packing till physically can't fit any more in.

Sorry for all the questions but as the jk isn't even a year old I don't wanna screw it up
Try to design the muffler with one end removable. With the perforated tube sitting in it already so you can pack around it. Then pack it real tight all the way, until you close the muffler with an end cap of sorts. No loose sections anywhere. Make sure you can pack every cubic milimetre

Don't design the muffler where you wrap the packing around the perforated tube, then insert it into the muffler. This design has fail all over it.

Remember, design it so the perforated tube sits in an empty muffler box, then pack real tight, then put on the end cap with hole for perforated tube to come out.

Shove large chunks of fibre glass in one end of the muffler, and ram the fibre glass in real hard with a rod of sorts. Keep shoving and ramming, ramming and ramming so it's mega compacted. And hey, if the muffler explodes...you rammed too much. Try and stop ramming just before it explodes open. Getting the point?

It's gotta be tight.
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  #10  
Old 20-08-2013
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Default DIY stainless muffler/what to pack with??

Rodger that, just keep ramming
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Old 20-08-2013
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Rodger that, just keep ramming
love it ......
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Old 20-08-2013
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Yep. Ram it hard. Like it's the first day of the new 'Month'.
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Old 20-08-2013
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Default DIY stainless muffler/what to pack with??

Haha, yep I'm picking up what your putting down..
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Old 21-08-2013
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I've built one for my steet car before and combined both stainless and insulation bat packing. Lasted great behind a turbo rotor. For the stainless packing I bought a shitload of stainless kitchen scourers. The tight flat round ones were perfect as they are like a donut and you just stretch them open and slide them over the perf tube. Mine was 3 inch perf though so was stretched pretty tight. This sounds dodgey but was easy to install and had no problems. The trick is the glass batting to stop the stainless around the perf contacting the muffler barrel. With this, there is not really any resonating. Like others suggested I made one end cap removeable to be able to repack but never had too after years of use. Great in design too as it is easy to install when packing and you're not burning the bat material inside when welding it shut. Also, just like lots are saying, pack it really, really tight and then some. Oh, and incase you missed my last point, pack it really, really, really, really tight!

Last edited by Stressball; 21-08-2013 at 07:09 AM.
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Old 23-08-2013
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Well ive received my piece of perforated tube, its 500mm long but wondering if its long enough.

Exactly how much will the volume of the muffler affect the sound? im trying to keep it as quiet as possible as i hate nothing more than a V6 thats sounds like it has open headers.

Obviously if its the size of a "hotdog" it wont do bugger all but would it get to a point where the size of a "straight thru" designed muffler wont be effective if that makes sense? not going to do much the size of a 44 gallon drum, right?


Stressball, thanks for the tip on the scourers, i know the ones you mean and how you've used them.


J
  #16  
Old 03-09-2013
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Default DIY stainless muffler/what to pack with??




Made a start on the muffler, I've got one end welded in and almost got the other end which is removable welded up

Just got to cut the tube in, pack it and make the rest of the exhaust to suit

Jlowe
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