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DIY Muffler :)

Harry Gypsna

Harry Gypsna

Dirty hippy Bastard
Veteran
Fantastic thread man, this is a really good bit of kit. Ive been looking into getting a silencer and I was planning to get 1 of these 125mm size,
http://store.ponics.co.uk/products.php?category=1869 the silencers are a bit down this page...
now i wont bother if its so bloody simple as that. I thought they would be some technical kit but this will be easy-peasy. Thank you man, this coupled with the speed controller i just built will keep the noise down great.
Be lucky :joint: :wave:
 
thescissors

thescissors

Member
just a little bit of foam works WONDERS for sound absorbtion!!



this is incompatible with my carbon scrubber idea, however, although i might at first at least keep the back wall solid and put a 2-3" thick piece of foam on it on the inside of the carbon scrubber..... :)




 
G

Guest

i like the idea, that definitely simplifies the whole baffling muffler idea (aka, standard car muffler, usessound cancellation through reflection, not absorbsion.
I think i might experiment with your idea with much smaller setups like 8" pvc tubing with 1.5 inches of poly fill around the inside held back with loose mesh or something. that would be for a 120mm 12v fan
 
G

Guest

whats the rating on this glass wool stuff? i have no experience with it. is it all created equal? what should i look for. does home depot carry it?
 
A

axel neek

I think it's just fiberglass insulation

you could also use a rock based insulation, like Roxul.
It's supposed to have sound suppressing properties as well.
 
marx2k

marx2k

Active member
Veteran
My only concern is that the fiberglass insulation is being blown around everywhere (dangerous). Even if it is going out a window, not all of it will go out the window especially if it has blinds on it. Like a few others in this thread, I would go with something less dangerous like quilt batting -- What *I* have a lot of are those damn stryofoam peanuts you get as packing with everything you get mail ordered to your home. Instead of having them taking 60,000,000 years to decompose in a landfill, I wonder how fitting a whole bunch of those as soundproofing material would work.
 
marx2k

marx2k

Active member
Veteran
Sorry to double post, but also I wonder what is the minimum length and width one would need on the muffler to effectively deaden sound. For instance, say you didn't want to use a garbage can to do this but would like to try something smaller.

Idea: Say you have a cab and you also happen to have a cat :)
If your fan is outputting through the top of your cab, you can make the muffler out of a cat litter pail (one of those 3.5 to 5 lb ones) and set it on top of the cab and have the air flow from the bottom of it through the top. Pretty stealthy.

But Im wondering is a 3.5 to 5 gallon pail would suffice or if you really NEED a garbage can to do this sort of thing.
 
G

Guest

St0n3r
Yes hardware \ home Improvement stores carry it. Not sure about rating on that batting stuff but the ridged stuff "Roxul \ rockwool" is rated by fire. the higher the rating better for fire, the less for sound. Using it for sound instead of foam you would want a lower rating (better for sound) but still is a real good fire barrier. as for the dust a few coats of HIGH TEMP paint will knock that right down in a sound \ fire application like in thescissors post.
 
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G

Guest

But Im wondering is a 3.5 to 5 gallon pail would suffice or if you really NEED a garbage can to do this sort of thing.
Click to expand...
Cars are preaty loud without a muffler, atleast "Walker" mufflers are made with the low fire rated rockwool real soft and light but still in a sheet form. But I don't know the "math" to "how much for this much sound". But they are just a car muffler not any bigger then any other muffler I've seen. Info from truck drivin' days.

AFTER THOUGHT

could you some how rig a car muffler to kill noise or would there be to much back pressure?
 
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T

treehuggers

Active member
marx2k said:
Sorry to double post, but also I wonder what is the minimum length and width one would need on the muffler to effectively deaden sound. For instance, say you didn't want to use a garbage can to do this but would like to try something smaller.

Idea: Say you have a cab and you also happen to have a cat :)
If your fan is outputting through the top of your cab, you can make the muffler out of a cat litter pail (one of those 3.5 to 5 lb ones) and set it on top of the cab and have the air flow from the bottom of it through the top. Pretty stealthy.

But Im wondering is a 3.5 to 5 gallon pail would suffice or if you really NEED a garbage can to do this sort of thing.
Click to expand...


Industrial mufflers are smaller than mine. I assumed mine has weaker effect since is DIY and overkill was my goal too. This one take 100% sound off i guess smaller would do the same, cant tell you how much smaller tho. I think with this DIY thinkgs you need to do some experimentation :)
 
G

Guest

tree thanx man i made my own based off ur model made a smaller one just like i was makin a scrubber, its easy as fuck to make too took about 15mins to make

now my 6" vortex doesnt sound like a tornado

made one on both ends intake and exhaust hard to hear it now if u dont know its there lol
 
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G

Guest

this isnt my pic but it looks just like this just not as fat my is longer

and there is plenty of duct tape on mine lmao

3075Image5.jpg
 
G

Grownz

Member
Great idea! I know this thread is oldish and i was wondering a few things.
Where would be the best place to put this in the ventilation system? Before the fan or after? I suppose it depends how the system is set it. Also, would this take away from a centrifugal fans ability to push the air through a carbon filter?
 
T

treehuggers

Active member
>Where would be the best place to put this in the ventilation system? Before
>the fan or after? I suppose it depends how the system is set it.

Depends wich end you want to silence. Normaly the noise on the exaust reprirents a problem so you need to put the muffler after the fan.

>Also, would this take away from a centrifugal fans ability to push the air
>through a carbon filter?

No. Just make it airtight.
 
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G

Grownz

Member
Thanks for the quick reply. I see you have yours after the fan. How did you set up your ducting before the fan? Do you use a carbon filter before the fan?

Thanks again!
 
G

Guest

my setup is filter>light> 600 vortex fan wrapped in insolation> muffler

cant hear shiiiiiiiiiiiiiiiiiiiiit
 
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