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Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > Making my onboard generator quieter

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deltabravo

Spokane, WA

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Posted: 04/25/22 07:19am Link  |  Quote  |  Print  |  Notify Moderator

Here's a good project that reduced the sound output on my onboard generator. Part number is of the resonator is 155-2449. I had a local car exhaust shop do the welding.

Resonator sound comparison


2009 Silverado 3500HD Dually, D/A, CCLB 4x4 (bought new 8/30/09)
2018 Arctic Fox 992 with an Onan 2500i "quiet" model generator

Lwiddis

Owens River area

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Posted: 04/25/22 09:35am Link  |  Quote  |  Print  |  Notify Moderator

Very interesting demonstration. TY for posting.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AMP Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


Fulltimers

Anywhere, USA

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Posted: 04/25/22 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

The title of this post is deceiving. The difference is insignificant. Not worth the money as far as I can tell.
My Generac 65G is pretty quiet. It is mounted wrong and resonates through the chassis which makes it louder inside than outside.


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CharlesinGA

South of Atlanta, Georgia

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Posted: 04/27/22 11:09pm Link  |  Quote  |  Print  |  Notify Moderator

I installed the same resonator on the earlier non-inverter model of the Onan 2500LP (runs at a constant 3600 rpm). The exhaust on mine has a "poot-poot" sound that was annoying, and after installing the resonator, the volume of the sound was not appreciably reduced, but the TONE was changed, and the "poot-poot" sound was pretty much gone.

Installing it on the new inverter model Onan 2500i probably has less effect as the engine generally runs slower (2445-2900 rpm) and never gets close to the 3600 that a non-inverter generator runs at.

Here is a video that I did showing the difference on my trailer. YT messed me up by converting it to a "short" so all of the description of what it is and why is not visible to the viewer unless they click the three vertical dots in the upper RH corner and select "description". I will have to eventually edit the video to longer than a minute by adding some BS at the beginning and end but for now you are stuck with looking at a 40 second short.

https://youtube.com/shorts/NQEtWhQr8ps?feature=share

I have since cut out a section of the pipe under the trailer and welded the resonator in place.

Charles


'03 Ram 2500 CTD, 5.9HO six speed std cab long bed Leer top and 2008 Bigfoot 25B21RB.. previously (both gone) 2008 Thor/Dutchman Freedom Spirit 180 & 2007 Winnebago View 23H Motorhome.

BarneyS

S.E. Lower Michigan

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Posted: 04/28/22 07:41am Link  |  Quote  |  Print  |  Notify Moderator

CharlesinGA,
Good demo! Thanks.[emoticon]
Barney


2004 Sunnybrook Titan 30FKS TT
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TurnThePage

North ID

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Posted: 04/28/22 12:44pm Link  |  Quote  |  Print  |  Notify Moderator

Agreed! CharlesinGA provided a great example of the improved sound. I would opt for that mod in a heartbeat.


2015 Ram 1500
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deltabravo

Spokane, WA

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Posted: 05/01/22 06:45am Link  |  Quote  |  Print  |  Notify Moderator

Fulltimers wrote:

The title of this post is deceiving.


It's not deceiving at all. Watch the video and you can see that the resonator did indeed reduce the sound.

CharlesinGA

South of Atlanta, Georgia

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Posted: 05/03/22 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

So the Inverter model, despite running slower and having a completely different motor, has, under load, that same chugging or Poot-poot sound that my non inverter model has, and that resonator seems to have about the same effect on your inverter model as on my older non-inverter model.

I took my pipe to a one man muffler shop and he welded up some cracks in the 90 degree bend of the pipe caused by a broken hangar in the past, and he cut out a section and welded in the resonator.

I had bought the resonator to install on my 3600LP generator in a motorhome I had, but everyone who had tried it said it simply didn't have any noticeable change in sound so I never bothered to install it. After I got my trailer and realized the sound the smaller 2500LP made I tried it and that is what you see in my short video. That led me to install it and in that process I discovered cracks in the pipe at the 90 coming out of the motor from a broken hangar that had been repaired using inner tube or similar rubber that left a lot to be desired. As I also had the proper Cummins hanger, new, I bought with the resonator, I changed it out and fixed everything.

Charles

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