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Old 02-23-2015, 02:02 PM   #11
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You could try tailpipe extensions sold at camping world take the exhaust noise up with the fumes have seen few used at races


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Old 02-23-2015, 02:04 PM   #12
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Onan Generator sound

There are pads that can be purchased to absorb the sound. I think they call them Dyna Mats
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Old 02-26-2015, 04:36 PM   #13
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What soundproofing material did you use? Can you post pics of the compartment?
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Old 02-27-2015, 11:22 PM   #14
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I just bought some Fatmat for my shockwave and hope to install tomorrow. It's not to loud but the wife sleeps longer than me so if I need to kick on the gen I want to take less chance at waking per up. I have a DB meter on my phone and will take before and after readings and will post them for you. I plan on doing the top, back and both sides of the box.
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Old 02-28-2015, 12:01 AM   #15
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Be careful not to block the air flow through the genset, the Onans are air cooled with a large fan (part of the harmonic balance on the crank shaft), part of the noise issue is it comes through the fan and down underneath the MH (nice sound chamber) if you figure out how to tame that part of the noise I would definitely be interested as I have the Onan 6500.
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Old 02-28-2015, 12:07 AM   #16
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The bottom of mine is completely open.
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Old 02-28-2015, 10:59 PM   #17
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Well I don't want to edit my post because I'm on my phone so I'll just paste it all.


Well I got some stuff accomplished today as I was interrupted to help my father in-law to help him with one of his rental units and then helping my neighbor with his motorcycle.

First project was getting the fastway flip jack installed. Very quick and easy install.


This is when I got interrupted.

Back at it.
I forgot to snap a picture but I used out label maker to label the 5 switches at the door for the lights.

Now for the next project. I took db readings inside the trailer and then used Fatmat to put around the generator box. This was a little difficult due to space. I was hoping to just put it all inside the box but I didn't have enough room to do that and I didn't have enough room in the box to move the generator around to be able to do it... So I had to put it all on the outside of the box except one side because it wasn't accessible.... So one side got covered inside the box and the other 3 sides outside the box.



Generator running when all db readings taken. I will note that the instant was bouncing around and the peak was changing every 2 seconds... So I'm just going up use the difference in the max number.
You can also see on the graph.

Before Bedroom - the generator is right below our heads...


After bedroom - a loss of 4 db! The only way I think I could lower it anymore would be to do the exhaust extension. But I'm happy with the loss of 4 db. It is noticeable to my ears.


Before living room/kitchen area - the peaks at the beginning of the graph were from me and I hit reset after and that's why it evened out.


After living room/kitchen area. A loss of 8 db!!! I'll take that!!!


I hope to get some more done tomorrow but we'll see.
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