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onan muffler alternative [message #275857] Tue, 14 April 2015 08:56 Go to next message
lqqkatjon is currently offline  lqqkatjon   United States
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
Senior Member
for anybody interested, I Installed an alternative muffler on my onan. my testing right now, shows it is a little bit louder then the original Muffler I had on there. But, I think by adding a little more exhaust pipe, I should be able to get it close to the same noise level.

info and pictures are on my blog:

http://lqqkatjon.blogspot.com/2015/04/flo-pro-1953-muffler-for-onan.html

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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Re: [GMCnet] onan muffler alternative [message #275864 is a reply to message #275857] Tue, 14 April 2015 09:35 Go to previous messageGo to next message
Len Novak is currently offline  Len Novak   United States
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Registered: February 2004
Location: Las Vegas, NV
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Senior Member
You can use 1 1/4 flex exhaust pipe from O'Reillys (formerly Kragen,
Checkers) for about $5.00 ft to replace the downpipe.

Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375

www.bdub.net/novak/





-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Jon
Roche
Sent: Tuesday, April 14, 2015 6:57 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] onan muffler alternative

for anybody interested, I Installed an alternative muffler on my onan. my
testing right now, shows it is a little bit louder then the original
Muffler I had on there. But, I think by adding a little more exhaust pipe,
I should be able to get it close to the same noise level.

info and pictures are on my blog:

http://lqqkatjon.blogspot.com/2015/04/flo-pro-1953-muffler-for-onan.html


--
Jon Roche
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Len and Pat Novak 1978 GMC Kingsley The Beast II with dash lights that work and labels you can see! Las Vegas, NV new email: B52sRule@Gmail.com http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375 www.bdub.net/novak/

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Re: onan muffler alternative [message #275866 is a reply to message #275857] Tue, 14 April 2015 10:09 Go to previous messageGo to next message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
Senior Member
For the bracket on my replacement muffler I used a 12" or so long piece of 1" galvanized strut. Positioned the open side of the strut towards the muffler and held in place with several large stainless wormgear hose clamps.

The muffler bracket from the generator frame was then bolted to the strut

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: [GMCnet] onan muffler alternative [message #275890 is a reply to message #275857] Tue, 14 April 2015 20:14 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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Registered: July 2007
Location: Sydney, Australia
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Jon,

Nice work! How about a nice CHROME tail pipe extension! Woo Hoo! ;-)

Regards,
Rob M.



-----Original Message-----
From: Jon Roche

for anybody interested, I Installed an alternative muffler on my onan. my testing right now, shows it is a little bit louder then
the original Muffler I had on there. But, I think by adding a little more exhaust pipe, I should be able to get it close to the
same noise level.

info and pictures are on my blog:

http://lqqkatjon.blogspot.com/2015/04/flo-pro-1953-muffler-for-onan.html

Jon

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] onan muffler alternative [message #275895 is a reply to message #275864] Tue, 14 April 2015 21:37 Go to previous messageGo to next message
Chr$ is currently offline  Chr$   United States
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
Senior Member
Len Novak wrote on Tue, 14 April 2015 07:35
You can use 1 1/4 flex exhaust pipe from O'Reillys (formerly Kragen,
Checkers) for about $5.00 ft to replace the downpipe.



Uhhh... I wouldn't use flexpipe anywhere INSIDE the compartment. It leaks eventually, rusts very fast, and you may end up with exhaust gasses burning your insulation in the compartment or starting a fire.

Just something I wouldn't feel safe with.

-Chr$: Perpetual SmartAss
Scottsdale, AZ

77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"

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Re: onan muffler alternative [message #275945 is a reply to message #275857] Wed, 15 April 2015 20:24 Go to previous messageGo to next message
lqqkatjon is currently offline  lqqkatjon   United States
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
Senior Member
I installed a little bit of pipe, and cut a 90 degree elbow off, and it made quite a bit of difference in the sound. I also installed a little bit of a stainless steel pot scrubber for a little extra, but I actually do not think it got any quieter after I added the pot scrubber. As soon as I put that pipe on that muffler, it changed its whole tone.

I updated my Blog with the pictures. It looks like I am pretty equal with my old muffler that was on it, and I can live with that. YOu hear alot of engine noise now as well as the exhaust. so I am not sure how much quieter it could possibly be. I will be comparing others if I cross path with any other working onans just for curiosity. I have less then $70 in this, and maybe 1.5-2 hours time.

I still do not see how anybody can sleep in the coach with that thing running... but it will be nice to be able to fire it up and run the roof A/C while in transit.

http://www.lqqkatjon.blogspot.com/

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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Re: onan muffler alternative [message #276583 is a reply to message #275945] Thu, 23 April 2015 19:36 Go to previous message
dservati1 is currently offline  dservati1   United States
Messages: 109
Registered: December 2013
Location: Western New York -Rochest...
Karma: 1
Senior Member
Nice job Jon!

'78 Palm Beach. car nut new to RV'ing 26 ft. 403 rebuilt in 2018, rebuilt tranny in 2014, Dave Lenzi knuckles & hubs, yada yada yada on ION wheels,Green Brady Bunch stock David Martin on Facebook

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