Attaching a car muffler to a generator exhaust

I have a small Coleman powermate 4000W generator with a DIESEL (sic) engine.

Needless to say, it is quite loud, perhaps partly due to being a diesel.

Besides other things like building an enclosure for it, I heard that one could attach a car muffler to the exhaust instead of factory muffler. If that is so, can someone suggest where I can buy or how I can build the adaptor between the exhaust and a car muffler. Also, where can I buy a used muffler. The exhaust's opening is a rectangular protrusion about 1.2x3 inches.

i
Reply to
Ignoramus19691
Loading thread data ...

I was not happy with the stock muffler that was on my Generac 5000W generator. I replaced it with a stock Harley Davidson Sportster muffler. I realize that not everyone has a H-D muffler lying around their shop, but they can be found on ebay relatively cheap. My 10hp Briggs (gasoline) had a

3/4" pipe thread in the exhaust port so making an adapter was easy. Building an adapter for your rectangular opening might be more of a challenge. Although the exhaust noise was lowered considerably, I found that quite a bit of the noise comes from the engine block itself. Jim
Reply to
Jim & Hils

FYI I wouldn't bother with a used muffler unless you're plain broke. New ones aren't that expensive.

Lane

Reply to
Lane

Not to mention the fact that several states (or is it a federal thing?) absolutely forbid any sale of a used exhaust system component. I haven't been able to get a clear answer on whether or not the law is aimed

*ONLY* at catalytic converters, or "everything from manifold to tailpipe", but everyplace I've ever tried to salvage exhaust parts, I've been given a blanket "It's illegal to sell it to you" statement, whether it was cats, a clearly "only minutes or hours from being brand new" muffler on a wrecked version of my car that I wanted, or a chunk of tailpipe.

I *SUSPECT* it's aimed specifically at the cat, and being interpreted overly "loosely" by the salvage places to mean "the whole exhaust system" as a CYA move, but...

Reply to
Don Bruder

My Generac's exhaust port came internally threaded for 1" pipe fitting, so all I needed to do was thread in a 1" pipe nipple, and then clamp on some flex hose to the muffler.

Tony

Reply to
Tony

Thanks Jim.

i

Reply to
Ignoramus19691

I bought two of SuperTrapp's "Quiet Mufflers".

formatting link
One for my COOT atv and one for my Miller welder/generator... the mufflers are terribly expensive but incredibly quiet. The bigger the resonator (3 sizes, I think) the quieter they are... I bought the largest one for the COOT (gotta be quiet in the woods or the old man will shoot me) and the middle size for the welder. I'm really happy with them both. David

Reply to
David Courtney

For a used muffler, any auto wrecking yard will have a bunch of them. Get the muffler with a bit of the piping attached and it won't be hard to bang an adapter together from some plate and the pipe. The temps are not that high so any welding of mild steel or so forth will do fine. Be aware that a lot of the imports have a multiple part muffler system where there is a section midway and another near the rear of the car to complete the quieting of the noise.

-- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works every time it is tried!

Reply to
Bob May

Ernie L did this a while back for his, with some success.. The details should be in Google. IIRC, there is still a lot of mechanical noise from the engine, although it is queter. I need to do it on my old Honda powered gennie, which has a metal box muffler, whcih is totally useless. Geoff

Reply to
geoff m

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.