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Old 08-12-2018, 12:30 PM   #1
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Default ONAN exhaust quieting

Hey all,
I just wanted to post this info about quieting the Onan 2500 propane generator. I recently installed a Cummins resonator to quiet the exhaust, and I've been really impressed with how well it worked.
The resonator (which differs from a muffler in that the exhaust flows straight through, and it therefore doesn't affect the exhaust back pressure) was my attempt to cut down the sharp :edge: of the noise. I really didn't expect it to reduce the overall sound that much, but for $35 in parts and $80 at the welding shop, I figured it was worth the experiment.
Now, I wish I had taken before and after reading with w a decibel meter. The noise is much smoother (which was expected from the resonator) and also about 20% quieter ( which is a pleasant surprise). It is by no means silent, but I feel much less self-conscious about running it in the back of a parking lot on a hot day to keep the dogs cool in the van.

So, here is a part number, and the location I installed the resonator. This is on a 2018 Pleasureway Ascent, so you may have a different exhaust pipe setup.

Rick
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Old 08-12-2018, 02:17 PM   #2
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We did the same. Dropped the sound by about 9 dBa and we are considering adding a second one to see if we can actually make the Onan quieter than the van engine at low idle.
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Old 08-12-2018, 02:21 PM   #3
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Quote:
Originally Posted by Phoebe3 View Post
we are considering adding a second one to see if we can actually make the Onan quieter than the van engine at low idle.
Interesting. I wonder what would happen if the exhaust pipe were tee'd into two paths through separate resonators and exiting on opposite sides of the vehicle.
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Old 08-12-2018, 03:57 PM   #4
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Anybody else notice that Cummins misspelled "resinator" on their box label?

Anyway, I installed one on our 1999 Xplorer last year and was also amazed at the sound "softening". Didn't measure with a db meter but it is much less intrusive and not nearly as annoying. Very worth while upgrade IMO.

Dave
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Old 08-12-2018, 04:43 PM   #5
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Found it on Amazon and several other places online. "Resinator" sounds like a 420-type device.

After I double-check to make sure I have room, I think I'll buy one of these.
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Old 08-12-2018, 04:59 PM   #6
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Originally Posted by avanti View Post
Interesting. I wonder what would happen if the exhaust pipe were tee'd into two paths through separate resonators and exiting on opposite sides of the vehicle.
That's a really interesting question... I don't know that much about exhaust physics... someone elsewhere suggested that a lot of the noise from these generators comes from their mechanical operation, and silencing the case (insulation?) is a good solution as well.
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