3880/3860/4080/4060/3780 Generator Exhaust Mod

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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby timp4411 » Fri Sep 20, 2013 7:32 pm

Rommer,

Thanks for the answers.... I appreciate it.

I was just at Home Depot today and didn't want to grab any parts until I had a better idea of what I needed.

I really look forward to doing this mod.

Thanks again.
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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby iukaman » Tue Jul 19, 2016 11:13 am

Just did the MOD on my new to me 3880! So much quieter

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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby kellyg » Tue Jul 19, 2016 1:51 pm

Jim,

I did it on my 3780 but had a Westerbeke (gas) 7.3kw without any negative impact.
I have since repowered with diesel and have a Phasor 8kw genset which does not need the modification as the unit is much quieter.

I also drilled 1/4" relief hole and painted the PVC pipe.
Gary Kelly
Mount Sinai, NY
2001 Regal 3780
REPOWERED WITH YANMAR 2011
Smooth seas never made a skillful mariner
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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby iukaman » Tue Jul 26, 2016 11:53 am

Does anyone know if it is possible to tap into the engine exhaust on the port side. It would help a lot to just dump it to the side than it is to echo in the back? Thoughts?
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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby kellyg » Tue Jul 26, 2016 1:12 pm

Prior to doing the modification, I had run PVC from the exhaust over to the port side. The reduction in noise was about the same both ways.
To reduce the noise, remove the back seats and please sound proofing in the entire area. The noise echoes in that dead space.
Gary Kelly
Mount Sinai, NY
2001 Regal 3780
REPOWERED WITH YANMAR 2011
Smooth seas never made a skillful mariner
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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby ChesapeakeLover » Fri Jan 06, 2017 9:48 pm

How does this not get yanked out during throttle up? I get once on plane the tube is out of the water...it seems it would be pulled out early during throttling up.
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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby iukaman » Mon Jan 30, 2017 5:24 pm

It hasnt yet. I used a heavy duty zip tie to hold the pipe to the cross member for the swim platform. I havent had any issues. Even got the bottom paint done and they painted the bottom of the PVC :)
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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby iukaman » Tue May 22, 2018 10:47 am

Well, mine finally fell off. I think the zip ties in the water for 2 years made it deteriorate. I started the generator and immediately was shocked at how loud it was. THought something was busted...will be making another!
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Re: 3880/3860/4080/4060/3780 Generator Exhaust Mod

Postby Chris_in_Texas » Tue May 22, 2018 4:08 pm

Use the larger 1/4" ties or larger. Here is an example:
https://www.uline.com/Product/Detail/S- ... -18-175-lb

They are expensive here, but make sure to use the black as they do have the UV stabilizer in them. They will last the longest.
Thanks, Chris

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