Re: Goodbye : Oil Dependency

mg wrote:
You might be just the man I'm looking for. I have a 5500-W, gasoline
generator that creates 80dB(A) of noise at 7 meters. I'd like to get
it down to about 55dB(A) at 7 meters.

I also have a generator. I bought it because it can go down to 50 Hz, so that I can use it to test a gadget I sell at 220vac, 50Hz for the European and the World market. The testing includes an outdoor sound measurement (while the gen is running). I reduced the exhaust noise (most of the gen noise emission) by treating the exhaust. The so called "muffler" supplied with most generators is not that at all. It's just mainly a spark arrestor.

One might buy a tractor muffler and fit it to the exhaust manifold to get some relief, but I really need a very good exhaust silencer.

So I had my son scrounge from the auto shop a 15 gallon oil drum. I bought about 10 feet of flexible exhaust pipe at NAPA and connected it to the gen exhaust via an (1"?) iron pipe nipple that fit the engine exhaust port and set on the inside of that flex pipe, retained by set screws for which I drilled matching holes. Then I pried off the top of the 15 gal oil drum, lined the inside with some R-11 fiberglass batt, set the lid back on loosely, opened the 3" feed hole in that drum top, and shoved the other end of the flex pipe down into the drum with fiberglass. Voila! a poor man's excellent noise muffler.

After an hour's running, the drum gets hot and accumulates condensate water, but by then my test is done, so I can then open, air out and dry the drum.

You can take that "design" anywhere you care to. (This process is called "entrpreneurship", unknown to Dems.)

I'd be OK if noise didn't go around corners. If noise didn't go around
corners, my late wife wouldn't have been able to yell at me from the
Kitchen into the TV room and I'd be able to put my generator in an
open hole in the ground.

I set my generator around and behind the house, using a 100' drag cord to feed juice to my sound test site. The house makes an excellent sound barrier. You choose the remote spot per your family's needs for quiet.

Angelo Campanella

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