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Old 07-11-2016, 07:47 PM   #1
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Generator Silencer

Yesterday I received the Onan Cummins resonator - 50 bucks from Amazon, four 1 1/2" clamps, two 1 1/2" metal couplings, and two smal rolls of muffler tape because the exhaust pipe as well as inlet and outlet of the resonator are 1 1/4 in diameter so I rolled some tape between pipes and couplings, all those $25 Advance Autoparts. Cut 10 inch of pipe in a middle, connected all together, put JB-epoxy in the seams, and painted the entire work with high-temp anti-rust paint spray $4 from Home Depot. All done in my home garage. The pictures are attached.
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Old 07-11-2016, 07:51 PM   #2
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Installed it back to the van, and the gen became really quieter.

If anyone have done it before, please share with me if I did right - is there no difference between inlet and outlet direction of flaw? Because I did not find any notes about it anywhere. Thank you!

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Old 07-11-2016, 08:00 PM   #3
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Works either way. http://www.airforums.com/forums/f240...ml#post1724973
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Old 07-11-2016, 08:49 PM   #4
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Mine is still sitting in its box . Hope to find someone to do the work as I am not looking to spend more time under the van.
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Old 07-11-2016, 09:01 PM   #5
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Thanks Mcrider, so I did correct if there is any flaw direction )

Amirm, there is really not difficult. If you don't like to do it yourself and don't want to pay a fortune at the dealership appointment, just go underneath of rear left side, and unbolt two nuts that holds the clamp of pipe tip, and two nuts which holds the clamp next to the generator, and remove the pipe from the gen. Bring that pipe and your new-in-box resonator to a local welding shop and they will do it for you all for 20-30 bucks. Then you will need to do is the rest - put the pipe back.
And Bingo )))
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Old 07-11-2016, 09:48 PM   #6
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Oh, I didn't realize it is just bolted together! Thanks a bunch. I might give that a try.
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Old 07-11-2016, 09:57 PM   #7
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Yesterday I received the Onan Cummins resonator - 50 bucks from Amazon, four 1 1/2" clamps, two 1 1/2" metal couplings, and two smal rolls of muffler tape because the exhaust pipe as well as inlet and outlet of the resonator are 1 1/4 in diameter so I rolled some tape between pipes and couplings, all those $25 Advance Autoparts. Cut 10 inch of pipe in a middle, connected all together, put JB-epoxy in the seams, and painted the entire work with high-temp anti-rust paint spray $4 from Home Depot. All done in my home garage. The pictures are attached.
My pipe was a press fit into the muffler so only needed two clamps. While it did quiet it down somewhat, it's still loud. Good thing I did mine as the pipe had a crack in one of the bends so I welded it myself.
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Old 07-11-2016, 10:10 PM   #8
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Oh, I didn't realize it is just bolted together! Thanks a bunch. I might give that a try.
Here's my install thread

I used the Cummins Muffler from Amazon.
Cummins Power Generation 155-2449
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Old 07-11-2016, 11:39 PM   #9
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Thanks 73. Was just reading your thread . It is so handy to have such information on the forum.
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Old 07-11-2016, 11:42 PM   #10
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Mark, your pipe is connected to the curbside of gen, but mine is on the left.
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Old 07-12-2016, 08:16 PM   #11
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You have the newer generator that Airstream started using when they switched to the Magnum inverter/charger.
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Old 07-12-2016, 11:11 PM   #12
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Okay I got it why
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Old 07-12-2016, 11:22 PM   #13
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Jim Parrett @ Airstream told me it was something about compatibility.
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Old 07-12-2016, 11:33 PM   #14
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Today I was in the trip to Miami, and I used the gen, and one time I released the start button too early, so the gen started to work for a second and shutoff. Then it did not want to start, it's starter turned with no ignitions. After 10-15 minutes I started it normally, and it's fine again. It was similar to old carburator engines ))))
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Old 07-12-2016, 11:35 PM   #15
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I learned something about generators when I put a muffler on one of mine.

Yeah, an advanced muffler quiets things down some, but most of the noise comes from the crankcase etc.

I am sure that is why most advanced and expensive inverter generators come housed in a sound deadening plastic case.


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Old 07-13-2016, 01:17 AM   #16
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Yes, and we need to look some way to insulate the generator itself then...
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Old 07-13-2016, 12:53 PM   #17
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Best way to "quiet" the generator is to not use it! The engine alternator charges the batteries at far higher current than the generator+charger do. It is also far quieter.
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Old 07-13-2016, 02:49 PM   #18
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Gen's primary use is AC.
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Old 07-13-2016, 03:33 PM   #19
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Best way to "quiet" the generator is to not use it! The engine alternator charges the batteries at far higher current than the generator+charger do. It is also far quieter.
I wasn't aware of that. Thanks

Bruce
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Old 07-07-2020, 04:01 PM   #20
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Just added this muffler, much better.. https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
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