truck talk?- you engineer types

Bob Bancroft · Dec 9, 2012

The exhaust system on my dump truck has to be custom built. I'm tired of the junk rotting out. We were thinking of making a whole system out of stainless steel. Rather than rolling a sheet to make a muffler, why not make it square, or rectangular? That would make it easier to build, and easier to hang along side the frame, behind the cab. Would that shape adversely affect the sound? The idea is to quiet it down, not make it louder!

northvale-PA · Dec 9, 2012

Simple explanation, a round conduit is just cheaper to mass produce. Also, for fluid movement( air is a fluid too), the surface of a conduit creates drag, due to friction. So a round conduit has less friction since is has less surface area. Who knows about the sound. That is a function of how the inner baffles work. So, try it out and see. That's actually how engineering is done most of the time. It's called controlled experiments.

Anonymous-0 · Dec 9, 2012

Don't know where your from but, Over here in NW. Pa. theres lot of places that will build you a ss. exhaust for the price of a new steel one, they will build a quiet muffler or a loud one

Adirondack case guy · Dec 9, 2012

Lots of guys around here that haul blacktop for a living have heated boxes. The exaust goes through all kinds of shapes before it comes out the back of the box, so I would think your plan will work.
Loren
PS sounds like the fall harvest is over for you also, as you are thinking about winter jobs. Here, the combine has been put in the barn for the season, and most of the fall plowing has been done. Not sure if K&M are going to plow down more corn ground or not. Sounds like the weather will hold all next week after rain, this afternoon-tomarrow.

JayinNY · Dec 9, 2012

Just talking about you below Loren! Lol, did you go to MacFaddens yesterday? I forgot to bring you number, I was gonna give you a ring and see if you were there,!!

pete black · Dec 9, 2012

I agree with northvale. Design of muffler greatly affects fuel milage thus it is cheaper and easier to meet mpg standards with rounded ones. Additionally, they accomanate baffles better with less metal use, therefore less metal, less weight, better mpg.

RodinNS · Dec 9, 2012

Why not just buy stainless parts that are already available?
I would tend to think that square corners would not be the best thing in an exhaust, particularly with stainless. Expansion/contraction could induce cracking in certain grades...
For the most part stainless flex is what I like to use... then see if you can get some stainless elbows for the rest. Muffler should last a long time anyhow...

Rod

ohiojim · Dec 9, 2012

not an engineer, but i was taught that air is a gas, not a liquid

Bryan inIowa · Dec 9, 2012

As far as flow bench testing etc ,air is usually treated as a liquid to a degree .

Bob Bancroft · Dec 9, 2012

We can build cheaper than we can buy. And I haven't found anyone who offers a SS muffler yet.

Don-Wi · Dec 9, 2012

Air is a gas, but it is also a fluid. Gases and liquids are both fluids and flow in much the same way.

Donovan from Wisconsin

Bob Bancroft · Dec 9, 2012

Yes Loren. I'm always surprised how different the weather is over there. I've seen you get on the ground way before we can.
Finished harvest record early- Oct. 22. About when we're usually getting started! And the corn came out of the field almost dry- another record. And not a bad yield either considering drought.
Merry Christmas.

JimEvans · Dec 9, 2012

Big flat areas will amplify and transmit sound more than a round tube. You can get around that if make the flat areas heavy enough to not vibrate.

Bob Bancroft · Dec 9, 2012

That's what I'm afraid of. I don't want a drum! I'm thinking if there are enough interior baffles, supporting the sides, it might be OK.

Lazy WP · Dec 9, 2012

Donaldson makes a stainless muffler, and I am pretty sure you can't build one as cheap as buying theirs.

Adirondack case guy · Dec 9, 2012

Jay,
I didn't go. Called the son Friday and he wasn't crazy about going, and when I got up and looked out my windows to the east and the fog was so thick I couldn't see the back of the yard, I didn't go. Besides the wifey wanted some things done so she could paint, so made here happy instead.
Loren

Walt Davies · Dec 9, 2012

Actually air is made up from many gases oxegen, nitrogen, carbon dioxide and many others in small amounts.
Walt

BCnT · Dec 9, 2012

mufflers on my C65 dump truck are home made out of 6"x 3/16 x 3' pipe with 1/8 plate end caps...inlet and outlets are 3" pipe...no baffles...not loud either...just a nice mellow tone out of that 454.

Janicholson · Dec 9, 2012

Subaru mufflers are stainless. (OEM) not cheap replacement. Jim

mattwillson · Dec 9, 2012

unless you can buy stainless/aluminum alloy, don't waste your money..it won't handle the expansion contraction and will split. experience is a biotch sometimes huh.

scotc · Dec 9, 2012

There is a difference between "liquid" and "fluid".

Fluid means it can flow. Which applies to gasses and liquids.

truck talk?- you engineer types

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