Muffler for my Generator??

[Jack & Donna Smith]

Ok..Enough..We are all Birders Togather.........
I need some basic info on mufflers. Our old 6.5 Onan gave up the
ghost, So we had a Emerald 5.5 installed.
(still have the 6.5 for electrical parts)
Problem is they connected the new Onan to the old muffler. It works,
but has a loud "Bark" to it. Not too bad inside the coach, but I am
afraid that I may camp next to someone bigger than me!!
Now I need a lesson in muffler engeneering. I know a straight thru
like a glasspac won't work, for obvious reasons. Will a larger
muffler be quieter than a smaller one, other things being equal? In
other words, Will one from a (say) 120 cubic inch engine be noiser
than one fron a 250" engine.
I am sure other factors involved, but I would like the Generator as
quiet as possible,,,,
Jack Smith
1973 FC 31
In HOT SoCal

[Dan Weaver]

My exhaust experience is on gas engine cars - not diesels. If you
have enough room, a straight through muffler, with a second smaller
resonator is the quiet yet high flow way to go (on gas engines anyway,
I assume a diesel would be the same, but could be wrong).

The "bullet" muffler makes a good resonator if you have room for both
a muffler and resonator. http://www.dynomax.com/race.stm
http://www.a-1performance.com/race_magnu...fflers.htm is
a direct link to mufflers and bullet resonators for sale.

http://www.dynomax.com/ may have a muffler of proper dimensions.
http://www.a-1performance.com/ has good prices, I prefer the dynomax
ultraflow brand (not dynomax turbo or magnaflow).
http://www.a-1performance.com/rv/index.htm = RV mufflers
http://www.a-1performance.com/diesel.htm = diesel pickups

If inlet and outlet sizes are ok (Tom Warner says 4" inlet), then I
would select the largest body size available that will fit your
application, and have a local exhaust shop put it in place.

Dan

--- In WanderlodgeForum@yahoogroups.com, "Jack & Donna Smith"
wrote:
> Ok..Enough..We are all Birders Togather.........
> I need some basic info on mufflers. Our old 6.5 Onan gave up the
> ghost, So we had a Emerald 5.5 installed.
> (still have the 6.5 for electrical parts)
> Problem is they connected the new Onan to the old muffler. It works,
> but has a loud "Bark" to it. Not too bad inside the coach, but I am
> afraid that I may camp next to someone bigger than me!!
> Now I need a lesson in muffler engeneering. I know a straight thru
> like a glasspac won't work, for obvious reasons. Will a larger
> muffler be quieter than a smaller one, other things being equal? In
> other words, Will one from a (say) 120 cubic inch engine be noiser
> than one fron a 250" engine.
> I am sure other factors involved, but I would like the Generator as
> quiet as possible,,,,
> Jack Smith
> 1973 FC 31
> In HOT SoCal

[mrdonut12]

Jack,
This may depend on the total length of the exhaust pipe.
I had an Emerald 4.0 on my 5th wheel and the exhaust came out
of the generator on the curb side and had a straight exhuast
pipe with no muffler running the width of the trailer, exiting
out from under it on the street side.
This made the pipe almost 8 feet long.
That thing was whisper quiet. If your total exhaust length
is only a few feet, that might be the difference.
I can also tell you from working with car exhaust that the
further the muffler is from the engine, the better it works.
If you have an 8 foot exhuast that's noisy, find a Honda
muffler from a small Civic and put it at the end of the pipe.
That should make it quiet.

George Witt
81 FC 35
Lincoln, Nebraska


--- In WanderlodgeForum@yahoogroups.com, "Jack & Donna Smith"
wrote:
> Ok..Enough..We are all Birders Togather.........
> I need some basic info on mufflers. Our old 6.5 Onan gave up the
> ghost, So we had a Emerald 5.5 installed.
> (still have the 6.5 for electrical parts)
> Problem is they connected the new Onan to the old muffler. It works,
> but has a loud "Bark" to it. Not too bad inside the coach, but I am
> afraid that I may camp next to someone bigger than me!!
> Now I need a lesson in muffler engeneering. I know a straight thru
> like a glasspac won't work, for obvious reasons. Will a larger
> muffler be quieter than a smaller one, other things being equal? In
> other words, Will one from a (say) 120 cubic inch engine be noiser
> than one fron a 250" engine.
> I am sure other factors involved, but I would like the Generator as
> quiet as possible,,,,
> Jack Smith
> 1973 FC 31
> In HOT SoCal