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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

how quiet is your onan?


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  #1  
Old 10-02-2015, 02:46:40 PM
Tracy T Tracy T is offline
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Thumbs up how quiet is your onan?

I finally got my jc's exhaust routed and I must say I am impressed! Dang the fridge makes more noise! I am sitting in my living room no more than 20 ft away and all I here is a steady purr.
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  #2  
Old 10-02-2015, 03:02:35 PM
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BRae BRae is offline
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Default Re: how quiet is your onan?

My JB is in a detatched garage about 8ft. from my bedroom side of the house Its 16X24. The silencer is inside the garage, an extra thread on muffler outside on the exhaust. It is barely noticeable in the bedrooms. Other parts of the house it is not noticeable at all. Outside. Anymore than 20-25 feet away its very difficult to hear.

---------- Post added at 03:02 PM ---------- Previous post was at 03:00 PM ----------

I think my new phone has an app for decibel readings. will have to get it out there and take some readings.
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Old 10-02-2015, 07:14:23 PM
Aknovaman Aknovaman is offline
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Cool Re: how quiet is your onan?

Mine is pretty quiet even in concrete driveway.

https://youtu.be/q2lVNJkbQs0
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Old 10-02-2015, 08:31:56 PM
Radarman Radarman is offline
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Default Re: how quiet is your onan?

With the little stubby muffler that came with my JB it's pretty loud. I wear ear protection when I am running it.

I plan on getting a large auto muffler for my JC. That should be much quieter than the JB.
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Old 10-02-2015, 09:13:55 PM
yellowlister yellowlister is offline
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Default Re: how quiet is your onan?

My 2,5 lk w/ nelson muffler is slightly noisier than a 2000 watt honda inverter gen.. ran one next to it for comparison.. was very impressed.. just engine noise is all u hear.. my 4.0 cck with original muffler that came out of a airstream trailer makes more noise but still pretty quiet.. my other onans with nelson mufflers make more noise.. id say my nh is 3rd.. than the bfas .. I wish I could make the jbs quieter ut its mostly air moving that u hear.
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Old 10-02-2015, 09:37:37 PM
JohnnyC JohnnyC is offline
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Default Re: how quiet is your onan?

My 15.0JC has an automotive cherry bomb for a muffler a.k.a. glass pack muffler. If these gensets were not fixed for 1800 rpms, my JC would probably be a good contestant in a muffler rapping contest. Actually, the noise is not too bad, but not the most quiet either. It sounds like a forklift on steroids.

JohnnyC
New Jersey
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Old 10-03-2015, 12:51:32 AM
richard.bessey richard.bessey is offline
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Default Re: how quiet is your onan?

With my Onan CCK, running 1000 watt load, 72 db at 23 feet away. Yes I have a sound meter and have compared various pieces of lawn equipment. The onan is one of the quietest.
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Old 10-04-2015, 01:50:40 AM
Jim Marcozzi Jim Marcozzi is offline
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Default Re: how quiet is your onan?

MY 12.5 JC whispers. I have a Nelson muffler and the outlet goes downward and exits parallel to the ground about 6" above ground level. The genset is enclosed in a home made housing that's lined with 4" pink fiberglass insulation for noise control.

Can't hear it run from the house.
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Old 10-04-2015, 02:53:41 AM
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Default Re: how quiet is your onan?

The enclosed 7.5JB I bought came from Onan with a Nelson Critical muffler on it. It's super quiet.
My 5kw CCK is pretty quiet even with 30 amps of load.
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Old 10-04-2015, 11:13:37 AM
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Onan Dan Onan Dan is offline
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Default Re: how quiet is your onan?

How quiet you ask I can lay down beside my 7.5 JB and go to sleep really my garage is 60 feet from my bed room window and any onan I have is so mellow it sings me to sleep other than that CCKB 10.0 3600 rpm now it is not quiet of course it is just a conversation piece I run my onans on the Summit oval or flat mufflers and they are nice the mechanical works on the motor in the garage is noisier than the exhaust out side.
Summit racing equipment Walker universal sound FX muffler 17903 1.5 inlet-- 1.5 outlet $24.95 plus shipping
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Old 10-04-2015, 03:03:00 PM
yellowlister yellowlister is offline
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Default Re: how quiet is your onan?

I have no desire to run my 10.0 ccka contractor series.. ran it once for 3 min.. was good enough for me! that thing will wake the dead..
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Old 10-04-2015, 03:11:55 PM
Wayne 440 Wayne 440 is online now
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Default Re: how quiet is your onan?

My RDJC is not at all "quiet". But it is not unpleasant compared to the sound of an unhappy spouse when the power goes off. Inside the house, you can easily forget that you are on standby power.
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Old 10-04-2015, 06:17:51 PM
Mikey NY Mikey NY is offline
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Default Re: how quiet is your onan?

I only run my djb with ear protection on. LOL. Holy cow it is loud. as a matter of fact it is louder than my ex-wife, and that is pretty doggone loud. That's why I got the ear protection in the first place
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Old 10-04-2015, 06:25:53 PM
Tracy T Tracy T is offline
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Default Re: how quiet is your onan?

Quote:
Originally Posted by mikey ny View Post
I only run my djb with ear protection on. LOL. Holy cow it is loud. as a matter of fact it is louder than my ex-wife, and that is pretty doggone loud. That's why I got the ear protection in the first place
yes a djb is pretty loud even with a good muffler. I got one of those also.
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Old 10-04-2015, 06:45:57 PM
Power Power is offline
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Default Re: how quiet is your onan?

My W3s with stock muffler (has a brazing repair at one end) is quieter than a car idling. The loudest thing is the pusher radiator fan.
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Old 10-04-2015, 08:13:46 PM
tdarden tdarden is offline
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Default Re: how quiet is your onan?

6.0 DJB may be the loudest thing on the planet. Last year when I would fire it up neighbors would come out of their homes to see what the "hey" was going on. Then go back inside after throwing me some dirty looks.

Currently building a sound proofed home for it and my 7.5 jb which is "sweet" even without a muffler.
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Old 10-05-2015, 08:22:09 AM
PopsGarage PopsGarage is offline
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Default Re: how quiet is your onan?

My MDJB lives in a insulated box with a fiberglass lift off cover outside of the garage, the exhaust is routed underground to a muffler (above ground) and to a exhaust stack that extends past the roof. The radiator is remote mounted with a small fan for cooling,this is a water cooled DJB a bit more iron than the air cooled units, with the covers in place it is pretty quiet. Ten feet away you might wonder whats running, during a power outage my neighbors small portable (3600 screamer) makes more noise.
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Old 10-05-2015, 12:40:51 PM
len k len k is online now
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Default Re: how quiet is your onan?

My 7NHM is pretty quite, it's about 15 ft from the house. Don't think I would hear it inside house except for kitchen exhaust fan vent aiming right at it. It's all engine noise, exhaust is EXSTREAMLY quite. It's got a rectangular pancake muffler, they got that design right. Onan just sits ~ 2ft off ground , no cover when I'm exercising it .
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Old 10-05-2015, 07:22:52 PM
marcjbeau marcjbeau is offline
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Default Re: how quiet is your onan?

Mine needs work..
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Old 10-05-2015, 09:16:11 PM
wsax wsax is offline
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Default Re: how quiet is your onan?

my 7.5 dkd shows 58 dba at 15 ft from it.
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