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Portable generator modification

Posted on 9/22/17 at 8:59 am
Posted by Wtodd
Tampa, FL
Member since Oct 2013
68531 posts
Posted on 9/22/17 at 8:59 am
OK I had another thread last week about portable gensets and I appreciate all the suggestions & recommendations. I bought the Generac GP 5500.

Anyway I started it for the 1st time yesterday and TBH it wasn't as loud as I expected (Hammertime said it would be LOUD) BUT if I wanted to "quiet it down" a little is it possible to add a muffler onto the existing muffler? OK I'm a first time genset owner so take it easy.

TIA
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43031 posts
Posted on 9/22/17 at 9:08 am to
Waste of time, and the added backpressure isn't good for a small engine. I just lean scrap plywood up against it to deflect the sound. It is a noticeable reduction in sound, and I have a bunch of old plywood laying around.

People also make plastic boxes for them with fans and exhaust vents, and I believe a couple of companies sell them
Posted by Wtodd
Tampa, FL
Member since Oct 2013
68531 posts
Posted on 9/22/17 at 9:11 am to
Thanks Hammer.....yeah I was thinking about the same thing but just wanted to ask the question anyway. I think even pointing the muffler away from the house would dampen the sound a bit too. Like I said it wasn't as loud as I thought it would be.
Posted by cajuncarguy
On the road...Again!
Member since Jun 2013
3135 posts
Posted on 9/22/17 at 9:12 am to
Make sure it's placed so as CO doesn't enter your house. Also if you're not sure get a CO monitor.
Posted by NYCAuburn
TD Platinum Membership/SECr Sheriff
Member since Feb 2011
57012 posts
Posted on 9/22/17 at 9:16 am to
quote:

I just lean scrap plywood up against it to deflect the sound. It is a noticeable reduction in sound,


This^^^ I have 3 pieces cut that I place on top and two sides, works great
Posted by Wtodd
Tampa, FL
Member since Oct 2013
68531 posts
Posted on 9/22/17 at 9:19 am to
quote:

I have 3 pieces cut that I place on top and two sides, works great

Will probably do this......and make sure I chain it to something
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43031 posts
Posted on 9/22/17 at 9:53 am to
Just make sure it has decent air flow and don't cover the exhaust with the plywood. Two old sheets of 1/4 OSB is what I use
Posted by Wtodd
Tampa, FL
Member since Oct 2013
68531 posts
Posted on 9/22/17 at 9:55 am to
I will....I may even cut a hole where the muffler is
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