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Old 10-16-2013, 12:32 AM   #29
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Local muffler shop - had this laying around for a Cummings diesel

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Old 10-16-2013, 06:36 AM   #30
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I don't have an Intertate, but I have worked with generators a bit.

Looking at the specs posted earlier, the real problem is the RPM at which these units operate.

It is very difficult to make anything turning 60 times a second quiet.

The lower RPMs of inverter type gensets is what keeps them quieter.


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Old 10-23-2013, 07:04 AM   #31
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Looking at the specs posted earlier, the real problem is the RPM at which these units operate.

It is very difficult to make anything turning 60 times a second quiet.

The lower RPMs of inverter type gensets is what keeps them quieter.
That makes a lot of sense. Someone claimed that most of the noise is exhaust noise, and I remember hearing the exhaust noise from mine, too, but it seemed like at least half of the noise from mine was engine noise.
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Old 10-23-2013, 07:09 AM   #32
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And it's also, I believe, an air-cooled engine which are inherently noisy.
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Old 10-23-2013, 04:26 PM   #33
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I can finally report back on my solution for what I consider to be noisy generator exhaust. I ordered the cummins resonator and I also ordered the 5S Super trapp muffler with 6" resonator from Jacks small engine, I tried both and the Super trapp was the winner hands down, there is almost no exhaust noise just the noise of the engine itself. I'm attaching a picture. I intend to add a hanger at the muffler attach point and omit the original factory hanger.
My SuperTrapp 5S is "in the Mail". This looks like a relatively simple and cheap solution to an annoying problem.
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Old 10-24-2013, 01:59 PM   #34
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I don't have an Interstate yet, but could you tell me where the generator is located?

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Old 10-24-2013, 02:08 PM   #35
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It is located behind the rear axle in front of the spare tire.
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Old 10-24-2013, 02:12 PM   #36
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I don't have an Interstate yet, but could you tell me where the generator is located?

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transversely mounted underneath the vehicle on the centerline and immediately behind of the rear axle.
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Old 10-24-2013, 09:38 PM   #37
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Is any portion of the generator mounted inside the cabin part of the motorhome?

I looked at a 2005 Roadtrek RS Adventerous last week. There was a box that had some portion of the generator under the bed inside the cabin covered with wood.

How is the generator noise inside the cabin when in the back with the TV on and the AC is running?

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Old 10-24-2013, 09:49 PM   #38
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The Airstream generator is mounted completely below the floor and suspended from the chassis.
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Old 10-24-2013, 10:35 PM   #39
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I can tell you the generator is the least of your worries when the AC is running - that thing is LOUD! My Bathroom becomes a phone booth when the AC is running The AC is loud enough to make it hard to carry on a normal conversation on the telephone.

Tv in rear bed was loud enough and neither the generator or the AC made it difficult to watch TV.

The generator noise isn't unbearable in the van but it is louder than I would like. Even with the muffler I installed (which helped the outside noise; more of a change in frequency than reduced amplitude I think) but glad I did it.
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Old 10-25-2013, 10:10 PM   #40
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I can tell you the generator is the least of your worries when the AC is running - that thing is LOUD! My Bathroom becomes a phone booth when the AC is running The AC is loud enough to make it hard to carry on a normal conversation on the telephone.
...
I wear earplugs at night if I have to run the AC.
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Old 10-28-2013, 08:25 AM   #41
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That makes a lot of sense. Someone claimed that most of the noise is exhaust noise, and I remember hearing the exhaust noise from mine, too, but it seemed like at least half of the noise from mine was engine noise.
I take it back. At the rally this weekend, there was a 34' trailer with an Onan mounted on the tongue, and it was a larger model than what is in the B vans. (Possibly a 3600, but I'm not certain...I do remember it was 184 lbs versus the 113 lbs of the model in the B vans.) When we walked past it as it was running, it actually wasn't that loud at all - and it was out in the open, between the propane tanks and the shell of the camper.

The one in my B190 seemed much louder, so assuming that it shouldn't be louder (perhaps even quieter, since it's smaller), I suspect the noise issue is the enclosure Airstream built for it rather than the generator itself.
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Old 10-28-2013, 11:04 AM   #42
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Was it air cooled or water cooled?
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