how many of you are running double mufflers on your gen set?

[busshawg]

subject says it all, I have a Honda EV6010, was thinking of this option

[bobofthenorth]

I was but probably won't continue to.  The actual exhaust noise is only a small fraction of the total generator noise. 

[Kwajdiver]

What Bob says,,,,,

Bill

[busshawg]

Good to know, thanks Bob, Is there a downside to a second muffler besides cost?  I have been thinking of switching out my 6010 for one of those Honda 3000's. I have heard them run and they are nice and quiet. The down side is less power and I'd have to buy a remote acc. kit I guess so I can fire it up from inside.

[cody]

On our revcon I ran an automotive style muffler on the onan and it dramatically cut the exhaust noise but like was pointed out that is only a small part of the over all noise issue.  In regards to the honda 3000, mine is whisper quiet but the downside is that honda doesn't offer a factory remote for it because of the manual choke.  Interestingly, I've been looking at the 6010 lol, is that the liquid cooled one, can the radiator be remoted for it?

[Tenor]

My 1965 (yes, that's the year!) Kohler 7.5KW gasoline model has 2 small automotive style mufflers.  Works great!

Glenn

[gus]

Grant,

I have a Honda EV6010 too and think it is great after my old noisy, shaky Onan. This thing is really quiet and no vibes anymore.The Onan used to shake the whole bus in spite of being mounted on huge rubber rings.

What type of box did you use? I made one of 1/2" plywood and lined it with sound deadening rubberized stuff from JCW covered by fireproof cloth from EHP.

I didn't use metal like the manual suggested because metal is so noisy. I can't imagine it being much quieter. 

Why don't you just stick another muffler on the exhaust pipe and find out and let us know what happens? I've thought of this but don't really have space for it except if I add an above the roof pipe for camping. If I do that I was thinking of adding another small muffler.

[cody]

can the radiator on the 6010 be remoted?

[fe2_o3]

Like Glenn I also have an ancient Kohler 7.5 KW gas with 2 small auto mufflers, but I converted it to propane. Dependable, quiet, and when gas was $5.00 propane was $3.00.   Cable

[PP]

Won't a second muffler create excessive back pressure?  Just curious, Will

[Van]

Just more heat from the extra bearings LOL

[JohnEd]

PP,

Back pressure is a function the size of the inlet/outlet pipes and a lot of other stuff.  Auto mufs are typically so much larger than what an Onan would call for that they generate no back pressure at all.  Adding a second in series should do little to choke up the exhaust.  The absolute best muffling device is "back pressure" and my stock Onan item has pipes that are an inch at best.  Need to find another way!  A cherry bomb type is a really poor performer in cars but it might be ok for an Onan.  I would go with a small oval or round resonating chamber like a stock item you find on cars as their main muffler.  Smallest 4 banger displacement you can find.

Use a tube and see how much induction roar you have.  That might surprise you....don't know.  If it is loud try to find the air clearer and induction hose from a 4 banger and incorporate that into your gen design.  My induction on my Lexus is silent and that intsake looks like it was designed by someone having a bad acid trip.  It has chambers and turns that have apparently no function but they all add up to noise cancellation and silent running.

Good luck,

John

[buswarrior]

Don't forget the high performance silencers.

The hospital grade ones do a lovely job, but are pricey.

Long round tubes...

Lost the links in the last computer failure...

happy coaching!
buswarrior

[JackConrad]

When we installed our PowerTech diesel generator, I called PowerTech and asked about mufflers. I was told by PowerTech to use only 1 automotive type muffler.  I followed there advice.  We had had no problems and as others have mentioned, the exhaust is only a small part of the total noise. Our exhaust exits in front of driver axle on drivers side. Radiator is remoted to rear of spare tire compartment. By doing this we have separated the noise sources, so that no matter where you stand you only hear part of the totalgenerator noise In front of bus you hear the radiator fan, near OEM AC condenser compartment (generator) you hear generator, near rear you hear generator exhaust.  Jack

[steve5B]

    Glenn (Tenor) 

  I too have one like yours 1976, I put a Honda muffler on mine and at max RPM (1800) for gasoline wow! what a change in Db.

  Have to return the left ear to hear it running!


    Steve 5B.......