So you are saying that a 27HP engine running slow so that it is putting out,
say.....14 HP, is quieter than a 14 HP engine running full throttle.

--
JerryD(upstateNY)

Neon John wrote:
Yes it is. I've written extensively about this in recent years. You
might want to try the google archives.

If you want a quick tip, look for marine acoustical treatments.
They're much more advanced than RVs.

You might also want to look at the photos he

http://www.johngsbbq.com/Neon_John_s...Quiet_home.htm

to study how Generac did it with their QuietPack line of generators,
the quietest ones I've ever laid ears on! Major features:

What is the sound level rating on those? Onan has 66db as about the
quietest
that they carry.

I don't know. Sound ratings are kinda BS anyway because so much
depends on how you measure it.

I do know that the Generac is quieter than an EU3000 at full load. At
a crafts show I parked my concession stand beside a guy selling
hot-transfer tee-shirts. He powered his trailer (lights and heated
presses) from an EU3000. Our generators sat nearly side by side. When
his presses were heating, the EU's noise drown out mine almost
completely. Mostly exhaust noise I think. At partial load with the
eco-throttle turned off (it would trip when the heaters turned on when
on eco-throttle), they were about equal.

I didn't have a dB meter with me, just the good old Mk 1 ears. But
several of us vendors stood around marveling at how quiet the Generac
was. The tee-shirt guy was kinda envious since my quieter generator
made almost 6kw, about twice what the EU can do. I was running more
resistive loads than him plus I had a 15kbtu air conditioner. While
he was sweating over those hot presses, I was luxuriating in cool
comfort :-)

John
---
John De Armond
See my website for my current email address
http://www.johngsbbq.com
Cleveland, Occupied TN
A foolish consistency is the hobgoblin of little minds.-Ralph Waldo Emerson