Exhaust for indoor gas engine?

[Max Welton]

Tonight's progress. On the way home I picked up 10' of galvanized conduit with a 1" ID. Then I cut a swatch of 1/4" steel plate and made a flange.

Tomorrow I'll start cutting and welding the conduit so it goes where I need it to go. I don't have a tubing bender, but I can make wedge cuts in the conduit to get it to go around corners.

The conduit was inexpensive. The 10' plus some m6x100 bolts was just under $11 with tax. I can live with that. The 1/4" plate was a left-over from something. That's why I don't throw out the scrap bits.

[Max Welton]

Couple more...

[Chris V]

On the exhaust systems I've seen they just used threaded 90's and like fittings, a 1-1/4" schedule 80 pipe would be pretty fun to bend w/o a very nice bender.

[Max Welton]

I need to practice my welding skills anyway. We'll see how it comes out. It isn't like the material is expensive ...

Max

[Dale M.]

Use plenty of ventilation when welding galvanized materials....

Dale

[Max Welton]

You betcha.

I got three corners done tonight ... and ran out of shielding gas.

To be continued (when the welding supply place opens tomorrow) ...

Max

[Bugfuel]

on galvanized stuff.. grind off the surface galvanization around the area you plan on welding. Have a fan blowing the smoke away from your face but not directly at the weld so it won't blow away the shield gas.

[Max Welton]

OK, done for today. So far so good.

As you can see, my pipe now goes all the way to the door where I poked a hole for the last bit of pipe.

The problem now is noise. It's quite loud.

I did remove the muffler so I could do a flange. But this will be too loud for the neighbors, particularly at night.

I plan to take the end under the sliding door to exit outside. Now I need a muffler.

Ideas?

Max

[Dale M.]

I believe in very beginning I recommended adding a FLANGE to the OUTLET of the MUFFLER and to take pipe out from there.....

Dale

[Max Welton]

I believe in very beginning I recommended adding a FLANGE to the OUTLET of the MUFFLER and to take pipe out from there.....

Dale

True. But the flange is currently holding up the pipe. I think the original muffler would have just folded up under the weight.

Max

[Max Welton]

Well, I really needed to run the compressor tonight. So I rigged up a temporary muffler.

The bottle actually made quite a difference, although I had to hold onto it to keep it from getting pushed off the pipe.

And it took several minutes for the pipe to begin warming up.

Max

[Max Welton]

And Dale, I will take a shot at using the original muffler. Looks like I'll have to drill a second set of holes to attach my flange.

Max

[Max Welton]

Well, I got the muffler problem solved. Turns out an old tire carcass soaks up a lot of noise.

The white hose is just something I had laying around. I'll pick up something that fits the pipe better tomorrow. Turns out the pipe just doesn't get much more than warm at the end. I ran it for 20 minutes and could easily hold it with my bare hand.

Max

[bradey bunch]

Just a thought.. How would a bucket of water work as a muffler? Like putting the end of hose in a 20 gallon bucket filled with water?

[bigmeat]

You have to be careful about back pressure. small engines such as that can easily burn valves due to exhaust issues.