Thread Tools Search this Thread Display Modes
Old 09-27-2012, 07:51 PM   #1
Senior Member
bshanafelt's Avatar
City: Seattle, WA
Vessel Name: Isobel K
Vessel Model: 37' Custom Pilothouse
Join Date: Oct 2007
Posts: 307
muffler or not?

my boat has a cummins 5.9BT.
Wet exhaust.

It has never had a muffler or silencer installed.

The boat is really not crazy loud even while underway, but I wonder if installing a muffler would make a significant difference.

I am thinking of trying an inline Vernatone or perhaps a Dapar (slip inside) type of muffler.

The purpose is to suppress some exhaust noise.

Has anyone moved from muffled wet exhaust to none or none to muffled?
Attached Thumbnails
Click image for larger version

Name:	VernatoneRound.jpg
Views:	115
Size:	15.6 KB
ID:	13294  
Attached Images

bshanafelt is offline   Reply With Quote
Old 09-27-2012, 09:57 PM   #2
Scraping Paint
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
We had the iron water lift mufflers on our boat replaced with custom fiberglass water lift mufflers a number of years ago. The big advantage of fiberglass is that they will pretty much last the life of the boat (so say the diesel shops). If you go with a muffler in a water-cooled exhaust system I think there would be a big advantage to going with fiberglass.

Click image for larger version

Name:	image-1381739881.jpg
Views:	176
Size:	56.0 KB
ID:	13295

Marin is offline   Reply With Quote
Old 09-27-2012, 11:03 PM   #3
ben2go's Avatar
City: Upstate,SC
Country: USA
Join Date: May 2012
Posts: 1,681
I have heard a few of those vernatone and water lift mufflers.They do quite the exhaust noise.The fiberglass ones help absorb noise in the case so it's even quites the engine room drone.However,they do not help with mechanical noise that diesels are so famous for.I love the sound of a hot rodded 5.9 Cummins but I the mechanical noise that a BT would make in a boat.The turbo 5.9 aren't very loud as far as exhaust noise.Maybe turbo whistle when running up,but that quites down once the cruise rpm are reached.It's late,and I have had a long day.I'll quit rambling now.

ben2go is offline   Reply With Quote
Old 09-28-2012, 05:52 AM   #4
FF's Avatar
Join Date: Oct 2007
Posts: 18,415
A water lift muffler is great at exhaust noise reduction , but the can must be sized to the engine exhaust volume.

On big engines the coolant water volume will usually need a bypass to not insert too much water into the exhaust and raise the back pressure.

Soundown ( 2 inch 2# lead) in the engine room , and absorbing paint will reduce the noise .

Harder is air intake silencing , tho the noise reduction paint can be installed in some intakes.
FF is offline   Reply With Quote
Old 09-28-2012, 10:45 AM   #5
Phil Fill's Avatar
City: Everett Wa
Country: US
Vessel Name: Eagle
Vessel Model: Roughwater 58 pilot house
Join Date: Oct 2007
Posts: 2,919
There is a in line muffler on both the main 671 and the Perkin gen set. Actually the 671 has two mufflers an inline muffler and a modified water lift to cool the exhaust. Out side of the engine room the 671 is quieter than the gen set.
Phil Fill is offline   Reply With Quote
Old 09-28-2012, 01:11 PM   #6
City: Montgomery, TX
Country: USA
Vessel Name: LITA
Vessel Model: Whitby 42
Join Date: Feb 2012
Posts: 797
Do you have a brand or size for the inline muffler? I have looked at several but have not made a choice yet.


BobH is offline   Reply With Quote

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 11:24 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012