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Old 12-09-2015, 07:49 PM   #15
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Shark, please enlighten me on the Onan muffler? 1st I've heard of this but seems like a plausible solution to a rather noisy propane fueled generator.
It's actually a resonator, not a muffler. I have one on my Interstate, and it provides about a 3dB reduction in volume, as measured by my decibel meter app on my smartphone. That means that the sound volume is cut in half from outside the van, but not from inside.

The Onan generator already has a muffler, inside the enclosure. A long exhaust pipe is added by Airstream to get the exhaust out from under the van so it's less likely to enter the van through one of the many floor penetrations. To install the resonator, the exhaust pipe is shortened, and the resonator replaces the cut-off section. However, the resonator is also heavier than the original exhaust pipe, so it may be necessary to add another pipe hanger.

One reason why the sound is still so loud from inside the van is that like all internal combustion engines, the Onan generator vibrates as it runs, and the vibration is transferred to the van's body through the mounting brackets. Reducing the sound of the exhaust doesn't reduce this vibration.
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Old 12-09-2015, 07:54 PM   #16
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Originally Posted by Protagonist View Post
It's actually a resonator, not a muffler. I have one on my Interstate, and it provides about a 3dB reduction in volume, as measured by my decibel meter app on my smartphone. That means that the sound volume is cut in half from outside the van, but not from inside.

The Onan generator already has a muffler, inside the enclosure. A long exhaust pipe is added by Airstream to get the exhaust out from under the van so it's less likely to enter the van through one of the many floor penetrations. To install the resonator, the exhaust pipe is shortened, and the resonator replaces the cut-off section. However, the resonator is also heavier than the original exhaust pipe, so it may be necessary to add another pipe hanger.

One reason why the sound is still so loud from inside the van is that like all internal combustion engines, the Onan generator vibrates as it runs, and the vibration is transferred to the van's body through the mounting brackets. Reducing the sound of the exhaust doesn't reduce this vibration.
Is there a specifice resonator or just one that fits?
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Old 12-09-2015, 08:07 PM   #17
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Is there a specifice resonator or just one that fits?
The one I have is made by Onan.
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Old 12-09-2015, 08:37 PM   #18
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The one I have is made by Onan.
Found it online for $44 shipped. As soon as it arrives I'll determine what I need for clamps and a hanger. Thanks for the tip protag. Should help.
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Old 12-10-2015, 12:15 AM   #19
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Shark, please enlighten me on the Onan muffler? 1st I've heard of this but seems like a plausible solution to a rather noisy propane fueled generator.
Bill
Here's a link to my DIY thread for the install. Like Protag said it makes a bigger difference outside but inside I saw less of a noise reduction which puts it on about the same level as the Dometic A/C.

Here's another thread discussing it.
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Old 12-10-2015, 06:07 AM   #20
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If I had to guess it reduces sway but doesn't increase ground clearance at all. High CG contributes to rollover if you take turns too quickly. But increasing ground clearance raises the CG and also contributes to rollover, so that would defeat the purpose.

On Edit— what MILATV said, which is a more technical way of saying what I said.

The 4x4 option - which my dealer said is available from Airstream - adds 3-4 inches of height, so that must increase the chance of a rollover, but in my opinion doesn't do much to increase any off-road ability due to that huge overhang at the rear.


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Old 12-10-2015, 08:28 AM   #21
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Congrats on the new rig.

It stinks about them deducting $1,000 for the ladder. They will probably use it as a sellng point and only remove it if the new buyer doesn't want it.
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Old 12-10-2015, 09:25 AM   #22
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My only thought is I would have gone with the VB Air Suspension option.


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Old 12-10-2015, 10:22 AM   #23
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As I previously posted I traded in my 2015 for a 2016 lounge solely to get the air suspension. I am very happy with the improved ride in the rear. We use the rear seating often for my grandkids. The initial post on this threat raised questions on the benefits of certain of the changes. I will add my two cents.

1. I view (not from a service or upgrade end) the benefit of having the electronic switches in the forward cabinet verses the rear as better. I can more easily read the voltage and turn on my generator.

2. The moving of the fuse box from under the rear lounge to the drivers side rear seat I don't like. I now have no storage tray under the rear seats and while the new pass through under the rear lounge seat to the back storage might seem good I don't find it useful.

3. I don't camp with the unit but use it as a day coach. I did order the screens both side and rear. The only reason I ordered the side screens was to allow the side door to open all the way. If screens are not ordered then a permenant stop is placed to allow the door to open half way. Unfortunately when I do open the door all the way ( gravity makes it happen by itself most times) I have to get out of coach to close door since screen is in the way) Further a new overhead cabinet above the second row passenger seat by the door is a head banger. I don't use the rear screen thus have no comment.

3. I had a white coach and chose a silver one so not to look like a Fed Ex truck. The black is very good looking but I am in Florida and want to avoid the additional heat a black vehicle would cause.

4. It is mentioned nowhere but on the 2016 you must manually turn on the rear camera everytime the engine is started. As regards the new side cameras, at first I did not like them as they automatically switch to side view when the turn signal is turned on. However, now I do like them it gives me added comfort to the red warning on the mirrors.
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Old 12-10-2015, 08:18 PM   #24
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Did AS put a temp sensor on the magnum this time?
YES!!!! …………….. and it even works!!!!
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Old 12-10-2015, 09:04 PM   #25
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3. Further a new overhead cabinet above the second row passenger seat by the door is a head banger.
How is it different than the street side second row overhead cabinet?
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Old 12-10-2015, 09:27 PM   #26
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How is it different than the street side second row overhead cabinet?
Because it's located over an entrance door where people have to walk under it to climb in or out?
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Old 12-11-2015, 12:57 PM   #27
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Done deal & delivered.

Mike at Tom Johnson in Concord NC took good care of me. Actually did entire deal on phone and Internet. I'm a busy man so their driver drove it to my house (2 hrs one way) and picked up the trade!

Already impressed with upgrades from 2014 to 2016. We will see how much I enjoy washing the black van - but it's all mine so looking forward to it!

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Old 12-11-2015, 01:35 PM   #28
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Beautiful, and congratulations on your new baby.


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