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Old 07-21-2015, 09:06 PM   #1
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Question Resonator

Numerous posts have recommended the Cummins-Onan resonator - 155-2449. My generator exhaust pipe OD is 1 1/4". Website for the resonator says it fits over 1 1/2" OD pipe. To those of you who have the resonator, could you tell me the size of your exh pipe. Seems that it would not fit per my tape measure and per the product specs.
Thanks to whomever can help.
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Old 07-21-2015, 09:45 PM   #2
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Get a small piece of pipe with an ID of 1 1/4" and use it for a bushing inside of the 1 1/2" pipe.
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Old 07-21-2015, 11:42 PM   #3
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I will try to measure mine tomorrow. I do remember that the muffler was a press-fit on to the exhaust pipe.
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Old 07-22-2015, 09:04 AM   #4
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I just found this video which makes me want to do this mod.

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Old 07-22-2015, 09:36 AM   #5
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After installing a resonator on my Interstate's generator, I find that the sound level inside the coach is unchanged, but the sound level from outside is measurably lower.

I think that's because a lot of the sound inside is caused by vibration transmitted directly through the generator mount, which is unchanged by the addition of a resonator.
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Old 07-22-2015, 10:13 AM   #6
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While I would like the inside noise level to be lower, my objective was to make it less objectionable to others (those outside). I am willing to tolerate the generator noise if I want to make popcorn in the microwave - but they shouldn't have to.
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Old 07-22-2015, 10:43 AM   #7
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The exhaust pipe on my generator measures 1 1/4" OD. I agree with Protag that the vibration appears to be the cause of most of the noise, especially when the muffler has been installed.

I am not sure that there is a muffler inside the generator housing.
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Old 07-22-2015, 04:29 PM   #8
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Thanks 73shark. Guess the resonator specs must be wrong - unless they changed the resonator pipe size without changing the part number.

While underneath I looked to see what the exhaust pipe is bolted to. There is an oval muffler about 3" minor diameter, 4" major diameter, 5" long.
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Old 07-22-2015, 04:50 PM   #9
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Mine just has a straight pipe coming out at a right angle from the bottom of the generator. That's why I thought maybe there wasn't any muffler besides the one that I just put on.
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Old 07-22-2015, 05:45 PM   #10
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I checked my order and the P/N is the same as the one Titus listed and it was a press-fit on the 1 1/4" exhaust pipe. The funny thing is that I seem to remember the spec was 1 3/8" OD for the resonator muffler. Bottom line is I'd confirm w/ the seller before I bought it.

Because it said 1 3/8", I bought that size exhaust clamps. While they worked, 1 1/4" would have fit tighter. I got mine at AdventureRV cuz they were cheaper than anyone else I could find.
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Old 07-22-2015, 05:56 PM   #11
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FWIW, here's a link to my install thread.
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