Welcome to the The Garage Journal Board forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   The Garage Journal Board > The Garage > General Garage Discussion

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-31-2011, 07:00 PM   #1
wgm
Junior Member
 
Join Date: Jun 2007
Posts: 8
Default portable Generator Exhaust mods

wondering if it is possible to add or modify an exhaust/muffler to reduce noise output for a 10k Generac Portable Genset?
-would adding something cause too much Back-pressure and cause operational issues?
-any suggestions to reduce the noise?
wgm is offline   Reply With Quote
Old 10-31-2011, 07:40 PM   #2
Alchymist
Senior Member
 
Alchymist's Avatar
 
Join Date: Mar 2009
Location: Central PA
Posts: 3,042
Default Re: portable Generator Exhaust mods

Most of the noise is from moving parts, more so than the exhaust. A sound deadening enclosure will do more to quiet it than muffler mods.
Alchymist is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-31-2011, 10:30 PM   #3
beater74
Junior Member
 
Join Date: Sep 2010
Posts: 20
Default Re: portable Generator Exhaust mods

I havent tried this mod but it is on the list

http://www.alpharubicon.com/altenergy/gensetquiet.htm
beater74 is offline   Reply With Quote
Old 11-01-2011, 10:43 AM   #4
wayne55
Member
 
Join Date: Oct 2010
Posts: 64
Default Re: portable Generator Exhaust mods

My situation was different, but I will still add this info. I have a 10 hp Briggs powered generator that I bought a new muffler to dampen the noise. It helped only slightly. Even with the "quieter" muffler, it is still pretty loud.
wayne55 is offline   Reply With Quote
Old 11-01-2011, 10:51 AM   #5
Cheap5.0
Senior Member
 
Join Date: Oct 2011
Location: The thumb (Michigan)
Posts: 486
Default Re: portable Generator Exhaust mods

Quote:
Originally Posted by beater74 View Post
I havent tried this mod but it is on the list

http://www.alpharubicon.com/altenergy/gensetquiet.htm
I will have to try this...thanks!
Cheap5.0 is offline   Reply With Quote
Old 11-01-2011, 11:42 AM   #6
2manytoyz
Senior Member
 
2manytoyz's Avatar
 
Join Date: Sep 2011
Location: Central FL
Posts: 414
Default Re: portable Generator Exhaust mods

Quote:
Originally Posted by Alchymist View Post
Most of the noise is from moving parts, more so than the exhaust. A sound deadening enclosure will do more to quiet it than muffler mods.
+1.

I learned this the hard way also. I bought a "Low Tone" muffler for a 4200W contractor grade model. It did change the sound to a more bearable pitch, but did not change the overall sound level.

Buy once, cry once. I went through $everal before finally buying a Yamaha EF2400iS. Very quiet, and sips fuel.
2manytoyz is offline   Reply With Quote
Old 11-01-2011, 12:14 PM   #7
eldirector
Senior Member
 
Join Date: Sep 2008
Posts: 537
Default Re: portable Generator Exhaust mods

A lot of the smaller gasoline gensets are air cooled, so you can't really build too much of an enclosure. I have seen folks extend the exhaust into a bucket of water to quiet it down. I suppose that kinda works. I've also seen them plumbed into an car/truck muffler, which also kinda works.

An enclosure with sound-deadening material and baffles/vents, with maybe even a small cooling fan, might work. Add on a better muffler as well. Not exactly portable when done.
eldirector is offline   Reply With Quote
Old 11-01-2011, 12:33 PM   #8
kbs2244
Senior Member
 
Join Date: Nov 2006
Posts: 6,286
Default Re: portable Generator Exhaust mods

Big muffler on a small engine will lower the noise.
The stock mufflers are puilt to a price point.
A small car muffler is big to a 10 HP engine.
kbs2244 is offline   Reply With Quote
Old 11-01-2011, 01:53 PM   #9
2manytoyz
Senior Member
 
2manytoyz's Avatar
 
Join Date: Sep 2011
Location: Central FL
Posts: 414
Default Re: portable Generator Exhaust mods

Quote:
Originally Posted by kbs2244 View Post
Big muffler on a small engine will lower the noise.
The stock mufflers are puilt to a price point.
A small car muffler is big to a 10 HP engine.
Well, that was theory many of us believed. However, try it yourself, and you'll quickly discover why expensive generators cost SO much. I'll give you a hint, it's NOT the muffler!

My Yamaha EF2400iS is only 53 dB. Whisper quiet. But the muffler isn't spectacular.



http://www.boats.net/images/diagrams...ES/EXHAUST.png

Part of the noise is the exhaust. Part of it is the noise of the intake. The rest of it is the mechanical roar of the moving parts. That last piece is where the money is on an expensive generator. Otherwise, we'd all buy cheap generators, and slap big mufflers on them.

Here's one of the previous generators I had:



Cheap spark arrestor type muffler. I bought a low tone muffler, which they now sell for $110 at Jacks Small Engine parts online. Take a look at the size of this...





It did not change the overall noise level.

Here's what an airfilter looks like on a Honda 2KW:



But many will take the same path I did. Buy cheap, fuss about the noise, modify it, fuss about the noise... later buy a quiet generator. But notice how few people buy a Honda or Yamaha quiet series generator, and wonder how to make them even quieter.

Good luck!

2manytoyz is offline   Reply With Quote
Old 11-01-2011, 05:17 PM   #10
scooterseats
Senior Member
 
scooterseats's Avatar
 
Join Date: Mar 2009
Posts: 101
Default Re: portable Generator Exhaust mods

On small generators the noise level is almost inversely proportional to the price. Conversely the life span is nearly the opposite.
Bottom line, you get what you pay for. For occasional power needs buy the "Contractor Grade" units for long term power with noise levels that you can tolerate, buy one of the better brands noted for long life and low sound levels, ie: Onan, Honda, Yamaha, Kohler, etc.
__________________
Ross Murphy
24X30 Brick Veneer with heat and AC
30X40 post construction metal clad
scooterseats is offline   Reply With Quote
Old 11-01-2011, 05:43 PM   #11
malibu101
Senior Member
 
malibu101's Avatar
 
Join Date: Jul 2005
Location: Walnutport PA
Posts: 2,230
Default Re: portable Generator Exhaust mods

I was firsthand personally amazed at how quiet the Yamaha generators are,
At the NHRA event at Maple Grove there was a display rig from Yamaha power equipment. They had a big generator running their display trailer setting right next to thier display table. It showed that it was 240V and the load was ~40 amps on each leg.
That thing just quietly purred along. Standing literally next to it and you could barely hear it running.
In my opinion, unless you've seen/heard one of these in action you can not believe how quiet they are! But of course, when you see the price you expect something real good.

Disclaimer- I have nothing to do with Yamaha and I have an old Homelite 4500W generator that is so louder than a freight train.
malibu101 is online now   Reply With Quote
Old 11-01-2011, 10:24 PM   #12
Greatbear
Senior Member
 
Greatbear's Avatar
 
Join Date: Jan 2008
Location: Columbia/Fulton, MD
Posts: 1,666
Default Re: portable Generator Exhaust mods

I have a huge Generac 17kW portable, and the exhaust is the least of the noise from that beast. The engine fan, the gen head fan, even the valvetrain noise contribute to the most noise from the thing. My old Coleman Vantage had more noise from the intake than the exhaust. A true "quiet" generator has not only a quiet muffler, but intake silencers, ventilation noise baffling, thick valve covers, etc. Some are also designed to run at "half speed" (1800rpm) using a four-pole generator head, while the best use a variable speed engine and an demand compensating inverter. All that makes for a pricier generator.
Greatbear is offline   Reply With Quote
Old 11-01-2011, 10:50 PM   #13
NUTTSGT
Super Moderator
 
NUTTSGT's Avatar
 
Join Date: Sep 2009
Location: Bucyrus, Oh
Posts: 17,061
Default Re: portable Generator Exhaust mods

Quote:
Originally Posted by Chip Chester View Post

Chip...
(proud owner of a Honda eu3000is for ten years now...)
Damn quiet generator there.
__________________
ERIC

Too much is.... Just enough.

My garage refurb thread.
http://www.garagejournal.com/forum/s...ad.php?t=75024


Are you military or prior military ? Please visit OUR thread and post your experience.
http://www.garagejournal.com/forum/s...ad.php?t=64422


Take a look what your USA honorable service may have done for you.
http://www.garagejournal.com/forum/s...d.php?t=100237
NUTTSGT is offline   Reply With Quote
Old 11-02-2011, 08:13 AM   #14
nehog
Senior Member
 
nehog's Avatar
 
Join Date: Jan 2010
Location: Jaffrey, NH
Posts: 6,325
Default Re: portable Generator Exhaust mods

I have a military MEP-004 with an ASK (Acoustical Suppression Kit). This generator has a 200 CI four cylinder diesel engine. The ASK insulates the entire system, and directs all 'noise' straight up (exhaust points up, air intake and outlet are also straight up too...)

It is quiet, you can hold a conversation while standing right next to it. Open any door however, and the noise level is painful. Exhaust noise is not the problem, it is plain old engine noise.

Even if air cooled, you can build an enclosure for it--simply build one with an air circulation system (fans) so that air is moved as appropriate. It goes without saying that any installation should be sufficiently far away from buildings and flammable substances (tanks, etc.) to be safe.
__________________
My name is Peter, and I'm never going to grow up.

30 x 60, oops, 30 x 72 (it got larger!) with a Rotary 10K lift.

http://www.peterhipson.com

AM General H1 NA Wagon (95)
AM General H1 Turbo Wagon (99)
Dodge Ram 2500 Hemi
Saab Turbo Convertible
VW Cabriolet
nehog is offline   Reply With Quote
Old 11-02-2011, 07:17 PM   #15
djjsr
Senior Member
 
djjsr's Avatar
 
Join Date: Sep 2006
Location: In the cornfields
Posts: 4,036
Default Re: portable Generator Exhaust mods

I put a motorcycle muffler on the Generac I had in my racecar trailer. It helped a lot but it was still not as quiet as a Honda or Onan. But it was a cheap fix and my favorite color ......... chrome.
__________________
.
Don in Illinois, home of political corruption and government incompetence.
djjsr is offline   Reply With Quote
Old 11-02-2011, 07:41 PM   #16
SpeedCoach
Senior Member
 
SpeedCoach's Avatar
 
Join Date: Oct 2007
Location: Chicagoland
Posts: 571
Default Re: portable Generator Exhaust mods

Part of me has wondered about how good these are...

http://supergenproducts.com/prod001-tent.html

in the meantime - my twins are plenty quiet....had many comments (compliments) from my neighbors at various NASCAR and indycar tracks around the region

SpeedCoach is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 07:16 PM.