Will a Car Muffler Make a Generator Quiet?
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2020-06-04に共有
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Generator Model# 030230.00
Engine Model# 204412-0147-E1
コメント (21)
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I’ve done something similar to this, but you MUST use a motorcycle muffler instead of a car, especially for single cylinder engines, because they’re designed for the constant 100-0-100 pulses of the exhaust, instead of the continuous gas flow from a multi-cylinder car. I personally used a stock Honda grom muffler and it was VERY quiet, and they’re not too expensive. Just make sure you don’t have a hole in the system 😊
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If anyone wants to mount an automotive muffler to a generator, it needs to be supported by the engine/alternator assembly, not the generator frame. Everything attached to the engine needs to be able to move as one unit because the engine and alternator are mounted on rubber isolators. If you don't, either the muffler bolts will vibrate loose, or something will break. Maybe both.
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Something to note about sound: the decibel measurement system is a logarithmic system, meaning, it isn’t a linear system (like inches or liters). What this means is: for every 3 decibels increase, sound pressure (or perceived volume) DOUBLES. So a 6 decibel increase in your measurement means that the sound pressure has increased 4 times.
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Try a sheet of plywood leaned against the generator to see if you can reflect the sound towards your neighbors and lower the level at your meter.
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A large amount of the noise is actually mechanical.
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Just a little tip. If you decide to use steel water pipe screwed into the block to mount a muffled remember the pipe is a lot thicker and won't disperse the heat and can burn out the exhaust valve. It has happened.
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Imagine welding up a muffler on a generator just to have the guy you sell it to make a video of him removing it
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I agree that a motorcycle type muffler would be a better mod. But actually the loudest noise of a portable genset is vibrating metal. Add more isolation to the mounts and the noise can drop a LOT. Enclose it with baffles while directing air and exhaust flow and you’ll make it practically disappear.
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The engine manufacturer usually makes a "quiet" generator muffler that doesn't always come standard on store bought generators (I know, I was shocked too). That's usually the best option to reduce generator exhaust noise over all the homebrew methods. It will never be whisper quiet because much of the noise from a small air cooled engine is not from the exhaust.
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I saw one running in southern Mexico once with a motorcycle muffler and it's the quietest generator I've come in contact with.
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Hole in the exhaust when you're testing volume? Sorry man, huge source of error there.
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Used this youtube.com/post/UgkxOTeIs0vv4_9B5hsmnLsk9r930uDQL… for the first time this weekend. It powered everything in my Rpod camper plus a small heater for my friend’s tent. I love the remote start!This works better than my two Honda 2000’s Very happy with it. Just make sure to do a proper break in. The instructions don't talk about it. Look it up on YouTube there’s some good videos on it.
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As soon as I saw that exhaust leak, I knew it wouldn’t be an accurate measure of noise...and then you changed out the entire stock muffler which did not have the original leak, that ended the entire shebang for me. (Fwiw, a small rough piece of wood held by hand will do nothing for noise abatement).
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The 3 dB rule, look it up if you don’t know it. That muffler did quite a bit of noise reduction.
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I've grinded and welded literally millimeters from a fuel tank, watching you remove the fuel tank for working on this gave me a good chuckle.
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Add an inline exhaust resonator pre-muffler. The standalone resonators will give it a deeper tone but they work WONDERS for quieting down an engine without a full cat.
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From some of my experimenting with portable generators. I found a great deal of noise came from the induction side. That mechanical sound of the valve opening and slamming shut makes a hell of a racket.
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As people have been talking about in many YouTube videos recently, a muffler is not the only serious component to car exhaust in terms of noise. The other most important component is the resonator, which shapes the sound, before it gets run through the baffles and chambers of the muffler. I think that without both components it's not a fair comparison.
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Fix the hole properly, support the muffler with a rubber mount, have the exhaust blow outwards, not down, and correct that loose mounting clamp, then test.
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You do realize that every increase of 3db is a doubling of sound pressure, right? (logarithmic, not linear) So, 5db is 3.16 times louder! (6db would be 4x, 9db would be 8x, 12db = 16x... Car muffler was doing a lot, actually. :(
