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Acdiesel 
Orange Level
Joined: 15 Jun 2012
Location: Rochester Ohio
Points: 2546
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 Topic: 720 onan muffler
Posted: 26 Jan 2020 at 12:56pm |
One of my 720's needed a new muffler and as you know there hard to find and the simplicity ones are not cheap and the outlet pipe goes straight. So i decided to make my own, thought I would share some pictures. less then about $30 to make, and it sounds pretty good.
Edited by Acdiesel - 01 Apr 2020 at 8:29pm
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D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf
D15 SER.2 DIESEL,D15 ser.II nf
D12 SER.I, D10 Ser.II
2-720'S
Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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macvette
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Joined: 13 Jun 2011
Location: nekoosa, wi
Points: 1656
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Posted: 26 Jan 2020 at 2:03pm |
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Fantastic that you have the skill set to do this. Me - not so much! lol.
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TimCNY
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Joined: 15 Apr 2014
Location: Upstate NY
Points: 1551
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Posted: 26 Jan 2020 at 4:02pm |
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I have an Ingersoll 4020 with an Onan engine, I'm very fortunate that the engine has for the most part served me well. Nice skill set, Acdiesel!
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I need more than 200 characters for my "signature." I'd love to see that changed to 250!
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Brian S(NY)
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Joined: 13 Sep 2009
Location: CherryValley,NY
Points: 3372
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Posted: 26 Jan 2020 at 7:36pm |
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God made man.Sam colt made man equal.
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Bird76Mojo
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Joined: 12 Mar 2015
Location: Illinois
Points: 221
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Posted: 28 Jan 2020 at 7:28pm |
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Looks very restrictive..
Did you at least pull apart the original to see how it was constructed internally?
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Acdiesel
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Joined: 15 Jun 2012
Location: Rochester Ohio
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Posted: 29 Jan 2020 at 11:09am |
yep I have a couple of these and they look the same inside.
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D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf
D15 SER.2 DIESEL,D15 ser.II nf
D12 SER.I, D10 Ser.II
2-720'S
Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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ac720nut
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Joined: 09 Feb 2016
Location: Dexter Mi
Points: 1217
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Posted: 31 Jan 2020 at 4:24am |
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Very nice fab job
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Bird76Mojo
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Location: Illinois
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Posted: 31 Jan 2020 at 6:06am |
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I wasn't trying to bash your build, so please don't take offense to my prior comment.
It's really no wonder that these engines can suffer from carbon build-up if the factory mufflers are that restrictive inside. It's certainly making me think that I'll open up my mufflers in the future.
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Steve in NJ
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 11776
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Posted: 31 Jan 2020 at 12:00pm |
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Great fabricating there Dan the man! Paint em' high heat Black and they'll look like NOS!
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Acdiesel
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Joined: 15 Jun 2012
Location: Rochester Ohio
Points: 2546
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Posted: 31 Jan 2020 at 7:02pm |
 Bird76Mojo wrote:
I wasn't trying to bash your build, so please don't take offense to my prior comment.
It's really no wonder that these engines can suffer from carbon build-up if the factory mufflers are that restrictive inside. It's certainly making me think that I'll open up my mufflers in the future. |
no offense taken at all, it was a great question. that was real my only worry in this project, was making too much back pressure.
Dan
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D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf
D15 SER.2 DIESEL,D15 ser.II nf
D12 SER.I, D10 Ser.II
2-720'S
Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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truckerfarmer
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Joined: 26 Jan 2013
Location: Watertown, SD
Points: 3215
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Posted: 31 Jan 2020 at 8:42pm |
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Rule of thumb is holes should be equal in area to inlet and outlet
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Looking at the past to see the future.
'53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer
Duct tape.... Can't fix stupidity. But will muffle the sound of it!
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HudCo
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3520
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Posted: 02 Feb 2020 at 10:47pm |
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looks good i have biult alot of mufflers and done alot of snowmobile pipes and the one thing that is certain is that it takes alot of time and most of the time you have to roll the size of tubing that you need but it sure is worth it when you get done
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