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Open Roads Forum  >  Class B - Camping Van Conversions

 > How Loud Is Your Generator?

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higherroad

Atlanta

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Posted: 05/01/12 03:58pm Link  |  Print  |  Notify Moderator

My '92 Roadtrek has a Onan Microlite generator. It works fine, starts up well and runs the ac and microwave well. But, it's loud! And, being right under the bed shakes the bedding area. This is my first generator and I'm just learning about them. Is this amount of noise to be expected from an old generator or is there some tuning or maintenance that can be done to quiet it down a bit?

retraite

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Posted: 05/01/12 04:09pm Link  |  Print  |  Notify Moderator

IMHO, there are a couple of things you can do.

First, add an Onan resonator "inline" to the genset exhaust. It's a cut and weld proposition, but fairly easy for a welding or muffler shop to do.

Second, make a small modification to the way the genset exhaust pipe is attached to the body. Remove the rubber mounting joint and replace it with a spring.

Both MyRoadtrek and Handbasket have posted on each of these points regularly and will likely chime in. Or, you can search earlier postings for their photos.

I've done both - thanks to them - and it DOES make a difference.

Cheers.

gerrym51

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Posted: 05/01/12 04:21pm Link  |  Print  |  Notify Moderator

go to rodgers website myroadtrek. he has a full section on this

Handbasket

Asheville, NC

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Posted: 05/01/12 04:36pm Link  |  Print  |  Notify Moderator

Assuming it's an Onan Microlite 2800.... On one that age, I'd suggest dropping it and removing the top green part of the box. There's a muffler inside the box (passenger's side), and that's the only way to inspect it & the piping leading to and from it.

This old post of mine http://www.rv.net/forums/index.cfm/fuseaction/thread/tid/25841618.cfm shows it with the top off; 1st photo is from the service access door side, and the muffler is on the right with a pipe leading to it from the cylinder head. Be sure all that stuff is intact.

That'll get you started. Then check the tailpipe. Be sure it's free to vibrate. Roadtrek has been known to use a too-rigid hanger on the outer part of the tailpipe. If it's constrained from shaking around, vibration is transmitted into the body thru the hanger, and the Onan isolation mounts can't work right. See Rodger's excellent web site for more info on that, and the Onan tailpipe resonator. http://myroadtrek.homestead.com/.

I'll post some more minor things you can do later.

Jim, "Beer me."


'06 Tiger CX 'C Minus' on a Silverado 2500HD 4x4, 8.1 & Allison (aka 'Loafer's Glory') www.tigervehicles.com

MAU MAU

New Hampshire and Maine

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Posted: 05/01/12 05:00pm Link  |  Print  |  Notify Moderator

Here is a video showing the effectiveness of the resonator.

http://www.youtube.com/watch?v=gQboSPqKtfE


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Jerrybo66

AZ

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Posted: 05/01/12 05:32pm Link  |  Print  |  Notify Moderator

I always thought that mega amounts of insulation was needed to deaden sound. Not true. I don't know your situation but sound causes vibration, vibration causes more sound. Because of the suggestions from the good folks on this forum I covered the dog box of my Arctic Cat Side-by Side with "Dynamat". I would of never thought the plastic box was vibrating to amplify the sound of the motor that much. If your generator is housed in a metal box I suggest you cover it with "Dynamat", as recommended by this group. It's expensive but with all the rip-off products today it's worth it. I've heard about Danamat before but because of the cost didn't have the courage to try it until the recommendation from this group. It's about $65.00 for 12 sq. ft. There's another less expensive product with an asphalt base that can't stand heat. I didn't want it.... As for the above, I've been there done that, but still, in my opinion.. Good luck..


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SWD

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Posted: 05/01/12 05:50pm Link  |  Print  |  Notify Moderator

I have a Yamaha 3000 at the back of the unit and when we are watching TV at the front of the rig , you can hardly hear it. Its just a soft purr.

BudJ

Kenner, LA

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Posted: 05/01/12 06:04pm Link  |  Print  |  Notify Moderator

"Is this amount of noise to be expected"

Don't know how loud the noise is, BUT the Onan used in class B's are LOUD.

Some solutions have been offered above, but it is still considered a loud RV generator. It is not a Honda or Yamaha. If you could eliminate All of the exhaust noise, it would still not be a quiet RV generator.

Bud

Davydd

Minnesota

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Posted: 05/01/12 07:37pm Link  |  Print  |  Notify Moderator

No matter what you do to deaden the sound you are still going to save lots of quarters with your free magic fingers bed.


Davydd
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Road-Trekker

California

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Posted: 05/01/12 08:14pm Link  |  Print  |  Notify Moderator

Here is another Onan resonator install. I replaced the factory exhaust hanger with an automotive rubber exhaust hanger. The resonator install really makes a big difference.

http://roadtreklife.blogspot.com/2011/08/diy-installing-onan-resonator.html

edit. link fixed

* This post was edited 05/02/12 10:52am by Road-Trekker *


Roadtrek Agile SS: DIY Mods,Camping, and Travel Adventures.


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