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Old 11-18-2009, 07:57 PM
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Making your own stainless mufflers?

Yeah...not much coin in my pocket, but lots of time & materials on hand. I'd like to build a flowmaster 44 style chamber muffler or maybe a bullet style. Has anyone made thier own with good results?

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Old 11-18-2009, 09:35 PM
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Not worth doing unless your going with SS pipes also, if you don't the pipes become the sacrificial anode and deteriorate faster than the rest of the system.
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Old 11-19-2009, 08:06 PM
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Thanks 4 Jaw. I know it sounds rediculous, but when I look at how much I have to do/spend, I have to squeeze every last penny out of my budget. The fam, House and expenses come first leaving very little coin for this project. I was planning on doing the entire system in stainless and obviously as much a possible myself. I know its expensive, but I just cant part with money on something that will need replacing before I know it.
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Old 11-19-2009, 08:45 PM
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I say go for it,if you look at flowmasters side they have a cuttaway showing how the 40 is constructed.I am wanting to make a scaled down 40 series muffler for a 4 cyl. engine to see if I can get a "ok" sound out of it.Try it,post build pics,and get a recording !
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Old 11-19-2009, 11:54 PM
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I've never seen anyone attempt it, I say go for it, thats really cool. I wouldn't care if the mufflers lasted longer than the pipes, atleast you'll still have the mufflers.
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Old 11-20-2009, 12:56 AM
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Last set of pipes I had installed on my 94 SHO cost me $300 CDN including resonator and mufflers, it lasted 8 years driving it everyday. $300 won't buy you much stainless steel I can tell you that.

This subject comes up quite often since the SS aftermarket ones are so expensive but once you price out the steel and then figure out the fabrication costs and welding they start to look like a bargain. I'm not saying don't do it, just don't expect to be saving any money...it will cost more in the long run unless you get the SS for free and you don't count your labor.

Good luck with your decision, this sport wouldn't be any fun without some innovation and hard work so don't let me spoil it...just be realistic about the saving money part.
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Old 11-20-2009, 05:05 PM
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Thanks guys. I'm a metal fabricator by trade and the company I work for throws out lots of scraps of 304 stainless sheet, various perforated materials etc. For a few bucks in the shop kitty, I can take what I need.

Time I have plenty...winter is coming (4Jaw, I'm sure you can identify) Spare coin, not so much. Trying to save it for things I can't make or repair. I don't need much in the way of forming the remainder. For now it will consist of a crossover after the headers, stainless cats & mufflers terminating at the rear axle. I'll let an exhaust shop do the over the axle part at a later date.
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Old 11-20-2009, 06:47 PM
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Cool! Free stainless is a bonus!

As for the construction I have found a box shape with angled baffles the easiest to fabricate, if you are really adventurous you can make a removable lid and interchangeable baffle plates to tune the sound. Have a look at the mufflers they use in circle track racing as they are typically square in shape and simple in construction. Don't forget to account for offset inlets and outlets if your chassis requires them, having offset ports makes it easy to tune the sound mellower since it doesn't have a direct reflective outlet for the sound to escape the box.

If you want to experiment you can play with the old HS science project of a water table, just set up a clear baking tray with 1/4" of water in in it and create shapes with plastercine and use waves to send sound down your "pipe". The idea being to create as many standing waves as possible before the exit port. I taught my kids about sound/light waves using this method and can be fun.

Have fun and post pics of your "boom box".
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Old 11-20-2009, 07:12 PM
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I made a set of chambered mufflers when I was a senior in high school,but they arent stainless,ran them for a year or so and chnged them out for much lighter cherry bombs when reworking my tailpipes.
Heres a video clip,
http://www.youtube.com/watch?v=sm9Oa5DBD28
If you like the sound and need measurments let me know and I'll try to get them for you.
Shane
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Old 11-21-2009, 06:46 AM
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Yes we made some, just used a picture of a chambered muffler as a template and welded them together.
They sounded ok, better than the glass packs that were on it.
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Old 11-21-2009, 10:58 AM
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Quote:
Originally Posted by Chevrolet4x4s
I made a set of chambered mufflers when I was a senior in high school,but they arent stainless,ran them for a year or so and chnged them out for much lighter cherry bombs when reworking my tailpipes.
Heres a video clip,
http://www.youtube.com/watch?v=sm9Oa5DBD28
If you like the sound and need measurments let me know and I'll try to get them for you.
Shane
Dang man that things a beast !
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Old 11-22-2009, 06:55 PM
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Quote:
Originally Posted by itsmecord
Dang man that things a beast !
Thats when it had a 305
Now its got a Vortec 406
Shane
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Old 11-23-2009, 07:45 PM
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I made my own out of A36 mild steel, copied the design from a picture of flowmaster, I like the way they sound, maybe a little too loud.

but to tell you the truth I'm not sure if I installed them in the rigth way 'cos the pic didn't show which way the gas flows, I just made a guess.

anyone can tell me which way they go? the flow is towards or against the cones? do you know what I mean?

Augusto.
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Old 11-23-2009, 09:14 PM
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Flow goes towards the point of the V baffle
Shane
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Old 11-24-2009, 09:07 AM
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Quote:
Originally Posted by Chevrolet4x4s
Thats when it had a 305
Now its got a Vortec 406
Shane
Wouldn happen to have your old drawings/dimensions on how u did it handy would you ?
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