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Old 08-23-2019, 02:15 PM   #1
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Default 2.8 onan

Can a muffler be used on the 2.8 Onan or how else would quiet this Generator?
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Old 08-23-2019, 02:59 PM   #2
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Can a muffler be used on the 2.8 Onan or how else would quiet this Generator?
There is a "resonator" that the manufacturer sells. It changes the sound a bit.

As a practical matter, nothing will make it quiet. This is one of the main reasons some people go with large Lithium battery packs.
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Old 08-23-2019, 08:08 PM   #3
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If you do a search, you'll find several previous threads. Most never satisfactorily quieting it in a substantial way.

I had a muffler shop weld a factory cummins/onan resonator on my b rv (first pic). It's your choice where to cut existing tail pipe as others have done it further out (second pic).

Disappointing that onan has failed to quiet their generators, but as Avanti said, the resonator changes the sound. Makes the sound note lower and more pleasing. Worth it, just don't expect too much.
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Old 08-23-2019, 08:22 PM   #4
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Here's a youtube sound test. I wouldn't say mine made that much difference, but mine is mounted close to the generator if that affects the sound in any way.

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Old 08-23-2019, 08:40 PM   #5
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Default Back pressure on generator

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Can a muffler be used on the 2.8 Onan or how else would quiet this Generator?
I have a 2.5 LPG and inquired about this with Cummins Onan.

They told me to skip it so I'm passing this along to you as well.

I imagine that your Pleasure Way cannot accommodate a large lithium battery pack like mine and changing it out is probably cost prohibitive. If you ever decide to go that direction you might as well start with a late model or brand new rig.

From what I've heard about these lithium batteries it's probably better to start new or just skip that as well. The generator is nice to have for air conditioning, backup power for the coach whenever you need it.

In my opinion, the cost to replace those batteries every few years is a huge expense, actually, it's all expensive. Either way, unless you're actually living in your rig, the noise factor is temporary.

I'm sure that there's going to be plenty of people who will disagree with me, but, don't mess with the design setup from the manufacturer ( Cummins Onan) and let the machine run in it's natural state.
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Old 08-23-2019, 09:41 PM   #6
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As I gather OP has already discovered, sleeping with an RV roof-type A/C unit immediately above you and an Onan genest immediately below you is pretty much a non-starter.

The good news is that much quieter replacement A/Cs have recently become available (several threads on this). The bad news is that the Onan is hopeless. I have added a second-engine alternator and have upgraded my batteries with enough capacity to give us a few hours of A/C running in the evening and try to seek out shore power when that isn't good enough. I still have our genset, but since it is nearly useless I am close to pulling it.

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In my opinion, the cost to replace those batteries every few years is a huge expense
How does this compare with the cost of replacing your genset every few years?
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Old 08-23-2019, 10:06 PM   #7
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Default Properly maintained genset doesn't need replacement every few years

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As I gather OP has already discovered, sleeping with an RV roof-type A/C unit immediately above you and an Onan genest immediately below you is pretty much a non-starter.

The good news is that much quieter replacement A/Cs have recently become available (several threads on this). The bad news is that the Onan is hopeless. I have added a second-engine alternator and have upgraded my batteries with enough capacity to give us a few hours of A/C running in the evening and try to seek out shore power when that isn't good enough. I still have our genset, but since it is nearly useless I am close to pulling it.



How does this compare with the cost of replacing your genset every few years?
Avanti, I'm glad you think this is so hysterically funny...
WOW..... what a world.....so adversarial....how can you call yourself unbiased with remarks like that.... You call that professional?

Of course there is maintenance on anything, I never said anything to the contrary.

Sure, go ahead and fly without a generator..... I really don't care what you think...

As per sleeping with the HVAC going, why not just go somewhere that's not that damn hot at night.

Normally, we open the windows and have the fantastic fan going it's usually a cool breeze.

AC on batteries is a very short term situation and I don't know how you can compare an under hood second alternator to a full sized generator..... maybe you can add batteries easily, not everyone has the space or the luxury of doing this. I don't think you can just add lithium batteries to any system without modifications to the electrical system and wires?
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Old 08-23-2019, 10:41 PM   #8
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Onan's are built to survive the elements. they are noisy but try dumping a bucket of water on a Honda eu generator
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Old 08-23-2019, 11:25 PM   #9
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Hi: I have a 2016 PW lexor. I hate the Onan 2.8 Had two resonators placed by muffler shop. Still loud. I increased the battery capacity to 400Amph lithium. I can run the air conditioner a bit without generator. Installed a micro air easy start that helps reduce the required start up amp on inverter. I actually carry a Westinghouse 2500 inverter generator and run it when I need air conditioner. It is not only the noise but the smell of gas is an issue for me. I converter the generator to burn propane. Just my personal opinion. I wish Honda would develop a quite durable inverter generator for the rv industry. I heard they looked at it many years ago but decided against it because of the limited market and sales. Thanks
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Old 08-24-2019, 01:02 AM   #10
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I wish Honda would develop a quite durable inverter generator for the rv industry. I heard they looked at it many years ago but decided against it because of the limited market and sales. Thanks
Yes. For better or worse, ICE power of all kinds are perceived as at end-of-life--they just aren't going to attract the R&D dollars necessary to do what is possible. The future is electric.
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