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Stainless Mufflers

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Stretching it out soon it will be a double!!!!!!
new ride
IMAG0059
PUDDLE OF OIL!
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Grit Mill in NC
Priorty1

Priorty1

Well-known member
Model # 7500SS it is a 5x10 oval muffler with a body length of 22".
The company that makes them is called IMCO out of Texas, the construction seems like the Flo-Pro's but these are offered in 409 stainless steel and they list for 77.10
Is this a good muffler or a bad muffler with a good price.
 
Inlet/Outlet sizes? Offset? I'm thinking 22" is a little long but I haven't seen what is available yet.
 
This muffler is a 3" in/out center/center. I was looking at putting this on a big block. They do offer other sizes,model# 7451 is a 4X9 3/4 with a body length of 16 1/2 inches also 3" in/out lists for 67.24
 
jdotson, is 2.5 in/out better than 3 in/out for a big block?Has anybody else heard of IMCO mufflers. or have any info on them pos or neg? Sounds like a good price for SS.
 
Go to http://www.magnaflow.com they have a hundred different sizes and shapes small round to large oval all in stainless their a good muffler that flows more air than any airboat would require. To find the right ones click American Mussel then hit products then American Mussel again then on the side window that pops up click universal they will have a muffler for any airboat application. I’m putting a set of these on my boat.
 
hey thunder i had a hard time finding mufflers on that site after i clicked american muscle.but it could have been me always clicking on the magnaflow girls thumbnails.no mufflers but nice tailpipes. i am kidding of course. :D
 
don't know if it means much but acording to the fwc report imco cm119 produced 3db less than a magnaflow 14326 on boat #13 @ 5200 rpm static, 6 db less then no mufflersat all
 
That’s their 2nd smallest muffler in that series the 14’’ body the only one smaller is the 11’’. Magnaflow has so many different mufflers if you want one quieter than that they have 4 versions quieter just in that series. The trick is to find the smallest one that’s the quietest.
 
Water Thunder
If you or anyone else could clear something up for me. In reading the sound research forum I was under the impression that I would need a large body muffler for a big block motor " the larger the better" is this true or can I get away with 16.5" body as opposed to a 22" body. Would like to get it right the first time....thanks
 
Priority1,
I may in part be responsible for your confusion since I posted quite a bit on that subject. My apologies if I didn't make myself clear. It's hard to make a very complicated point in just a few lines on a site like this.

Too often, people get the idea that a small muffler makes more horse power than a larger one. They think that the less time that exhaust gasses have to spend inside the body of a muffler, the better. So a smaller muffler body must make more horsepower than a larger one ... right?

The truth is that horsepower is all about flow ..... from the time air enters the throat of the carburetor until it exiits the tailpipe. Actually it's more about flow management. Making the airflow through an engine act like you want it to from beginning to end.

A lot of small bodied (reverse flow) mufflers are very restictive because they lack the internal volume or the baffle design to permit the flow that an application (particular engine) requires. A properly designed muffler doesn't have to be large, but a larger one may have enough internal volume to compensate for less than perfect internal design so that it won't kill the engine with back pressure.

I hope this helps.

BF
 
Big Feather,
Sorry for the delay in getting back. That does clear some things up, when you say reverse flow is that a muffler that you can mount in ethier direction or one that changes the direction of flow within the muffler? To me it looks like these mufflers have a baffel in it with no packing that might cause restriction. Would a 16.5" body muffler of this type with a 3"in 3"out be good for a big block motor pushing around 530hp?
Thanks for all your help
 
Priority1...you may be able to contact the manufacturer directly and see if they have specs. I know Swampjet has a book or something from Dynomax that tells how much flow rate each muffler has as well as how much hp each muffler/pair of mufflers can handle. I would think each company would have that info. If you find anything let us know.

Adam
 
Priority1,
In very general terms, a reverse flow muffler is one you can't see through, like a glass pack for example. The exhaust gas is forced to change direction somewhere between inlet and outlet.

A true reverse flow muffler in industry terms will have the inlet and outlet tubes offset from one another ..... the exhaust gasses will come in one tube, and then have to make a 180 deg. turn (actually "S" turn) to get back out. That's where larger body/internal volume becomes important.

A lot of the newer, smaller mufflers like the Dynaflows have an internal baffle that the inlet gasses slam into, and then exit out around the sides of the baffle to the outlet end. Nothing wrong with that when properly designed, and MUCH better than a glass pack.

BF
 
Big Feather, Black Powder
Thanks for all the help, I will call the manufacter and see if I can get some info on the flows I will post any findings.
 
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