Making a standard Gen Quieter

jkam

nomadic man
I would think an enclosure is the best at quieting down one that isn't already in one.
The Onan QD 10k in my buddys Winnebago is surprisingly quiet. It's completely enclosed.
 

dbhost

New member
Assuming running the exhaust into water will make a lot of difference, which I doubt - 12 hours running is likely to evaporate a few gallons of water so the level will need to be automatically maintained. May need to augment storage capacity to cope.
I live very close to marinas with lots of boats and I can assure you, water does very little to quiet engines down unless it gets sucked into the intake.
 

robert

Expedition Leader
Holy thread resurrection. A glass pack is one of the worst mufflers since they were designed for muscle cars. Some of the small engine manufacturers make a quieter muffler for their engines, you have to check with them though. As noted, a lot of the noise is from the rattly contraption itself (Hondas for example are much tighter tolerances and quieter). Put sound adsorbing pads on the inside of any body panels, use rubber or urethane bushing to isolate the motor from the metal frame, coat the metal frame with bed liner, and install a better muffler. Back when I did environmental work part of that was electrofishing. We cut the muffler off the Coleman generator and welded on a bit larger one which helped- remember, sound is a logarithmic function, not linear. I've seen several people remove the muffler and install a flange on the exhaust port. When they got to camp they would dig a hole and run a flexible hose from the generator exhaust to the hole. It actually helps some.
 

Mwilliamshs

Explorer
I live very close to marinas with lots of boats and I can assure you, water does very little to quiet engines down unless it gets sucked into the intake.
Being out on the water makes sound carry very well. Two boats moored a few hundred yards apart can converse between them quite normally if the water is calm and ambient noise is scarce. It acts like an amplifier. It's why Jesus gave sermons from a boat to crowds on the shore. That trait of water has nothing to with its ability to quiet exhaust forced through it. It's a dense, cheap, readily available liquid that works well as a muffler. My two-stroke 9.9hp evinrude run with water hose earmuffs (exhaust open to the air) is over 3x louder than the same engine run in a barrel of water.

So a boat that's using say 250hp can be very quiet to those near it but if the exhaust breaks the wake it's gonna be loud on the shore. Likewise, the high-winding seadoos zipping around on 50hp can be obnoxiously noisy as their exhaust is constantly breaking the wake as their hulls noisly bounce across the surface. If water wasn't a very very effective muffler, every lake would sound like a nascar race. Bear in mind, boats use no muffler other than the water so if it didn't work, it wouldn't be debatable.
 
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dbhost

New member
Being out on the water makes sound carry very well. Two boats moored a few hundred yards apart can converse between them quite normally if the water is calm and ambient noise is scarce. It acts like an amplifier. It's why Jesus gave sermons from a boat to crowds on the shore. That trait of water has nothing to with its ability to quiet exhaust forced through it. It's a dense, cheap, readily available liquid that works well as a muffler. My two-stroke 9.9hp evinrude run with water hose earmuffs (exhaust open to the air) is over 3x louder than the same engine run in a barrel of water.

So a boat that's using say 250hp can be very quiet to those near it but if the exhaust breaks the wake it's gonna be loud on the shore. Likewise, the high-winding seadoos zipping around on 50hp can be obnoxiously noisy as their exhaust is constantly breaking the wake as their hulls noisly bounce across the surface. If water wasn't a very very effective muffler, every lake would sound like a nascar race. Bear in mind, boats use no muffler other than the water so if it didn't work, it wouldn't be debatable.
Fair enough. Good explanation too.
 
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