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Old 09-08-2011, 07:33 AM   #1
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Cheap replacement for an Onan muffler

Well, we managed to crunch&munch the muffler for the Onan generator (long story).

A replacement Onan muffler from ppl costs over $200- not a popular option! I'm thinking that I can just find a small muffler at a reasonable price and stick 'er on there. Space is not an issue, I can pretty much fit whatever I want in there.

Is there a reason why this won't work?
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Old 09-08-2011, 12:38 PM   #2
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I crunched the muffler on my Kohler a few weeks ago, pulling out of Autozone of all places. It is still functional but is a mess, so it will need replaced sometime soon. I'm going the same route as you and not paying through the nose for direct replacement. A muffler is a muffler. My only two concerns will be noise and too much back pressure/heat from an overly efficient muffler.

Not sure if the Onan uses a screw in pipe with locking nut for connections like mine, but I will be replacing that with U-bolts anyway. Locknut's are terrible for this type of application, they have nowhere to go but expand, contract, rust and come loose.

Anywhoo, I don't see anything holding you back from using any small car, motorcycle, tractor muffler, as long as it does not constrict the exhaust too much.
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Old 09-08-2011, 12:57 PM   #3
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Originally Posted by tclowes View Post
A muffler is a muffler. My only two concerns will be noise and too much back pressure/heat from an overly efficient muffler.
If "A muffler is a muffler" then why are you worried about the noise and too much back pressure? If that were try you could buy the cheapest used one at a wrecking yard!
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Old 09-08-2011, 01:01 PM   #4
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Try a lawn equipment dealer..
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Old 09-08-2011, 01:33 PM   #5
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Smile

Quote:
Originally Posted by Mr_D View Post
If "A muffler is a muffler" then why are you worried about the noise and too much back pressure? If that were try you could buy the cheapest used one at a wrecking yard!
Do you have anything constructive or helpful to add to this thread? Personal attacks are not appreciated. Take it to PM please.

A muffler IS just a muffler. A device that redirects exhaust flow through a series of baffles to dampen output noise and keep compression at optimum level so as not to lose horsepower.

Perhaps I was too vague. Any muffler of the right size will work. ie: having 1" pipe and small enough to fit the application. I wouldn't take the muffler on my Kohler and put it on the 454 on the RV, and vice versa.
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Old 09-08-2011, 01:55 PM   #6
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Try Ebay -- there are usually a few available that won't cost an arm/leg
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Old 09-08-2011, 02:06 PM   #7
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Will a Walker Exhaust P/N 21585 work?


Inlet 1 1/2"
Outlet 1 3/8"
Shell 18 1/2"
Overall 21"
Diameter 4 1/2"
Muffler/Spark Arrestor
Designed for Onans in Motorhomes

Around $120

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Old 09-08-2011, 05:46 PM   #8
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Old 09-08-2011, 05:50 PM   #9
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Quote:
Originally Posted by Senior Chief View Post
Well, we managed to crunch&munch the muffler for the Onan generator (long story).

A replacement Onan muffler from ppl costs over $200- not a popular option! I'm thinking that I can just find a small muffler at a reasonable price and stick 'er on there. Space is not an issue, I can pretty much fit whatever I want in there.

Is there a reason why this won't work?
How about a motorcycle salvage yard for a muffler.
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Old 09-08-2011, 05:52 PM   #10
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Thats still stoopid money for what is a 'basic' muffler....


Whats your part # for that?

Heres a $51 one: http://www.perr.com/cgi-bin/shopper....y=ONA6155-1258

For 75% less, I'd make it work..
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Old 09-09-2011, 06:13 AM   #11
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Wow, serious thanks, fellas!

I appreciate all the links and suggestions.
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Old 09-09-2011, 06:41 AM   #12
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Does your original muffler have a spark arrestor in it?
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Old 09-09-2011, 07:28 AM   #13
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I questioned the cost of an Onan muffler and was told it was ~$38 from Onan.
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Old 09-09-2011, 06:05 PM   #14
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Does your original muffler have a spark arrestor in it?
yes
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