Reply
 
Thread Tools Display Modes
 
Old 02-14-2014, 10:09 AM   #1
Guru
 
fryedaze's Avatar
 
City: Solomons Island Md
Country: USA
Vessel Name: Fryedaze
Vessel Model: MC 42 (Overseas Ltd) Monk 42
Join Date: Sep 2011
Posts: 1,052
Venatone inline muffler install

I will be installing inline mufflers on our 6BT5.9M Cummins next month. Looks like a really straight forward install. I am posting to get insights from the group and questions on things I have overlooked. The boat currently doesnt have mufflers. The attached drawing is not to scale but has critical measurement. Mufflers are Venatone MKII Round 1400006.
Attached Thumbnails
Click image for larger version

Name:	muffler1.jpg
Views:	83
Size:	59.3 KB
ID:	27372  
__________________
Advertisement

__________________
Dave Frye
Fryedaze, MC 42 (Monk 42') 1989 Overseas Co
http://mvfryedaze.blogspot.com/
fryedaze is offline   Reply With Quote
Old 02-14-2014, 10:38 AM   #2
Guru
 
Scary's Avatar
 
City: Walnut Grove Ca
Country: USA
Vessel Name: Cary'D Away
Vessel Model: Hatteras 48 LRC
Join Date: Apr 2012
Posts: 884
Support

We just installed two. They will need to be supported. Either in saddles or hung. Are you planning to use Venitone tubing as well? We installed these in an old Chris with six inch copper tubing. How would you like to buy that today. Double clamp everything right.
I witnessed one of these blow up like a bomb. Mechanic installing rebuilt gas engines managed to damn near blow himself out of the boat. The spigots on the mufflers had just been repaired with glass and resin. I'm not sure if the fumes from the resin or the fact the mechanic was having trouble getting the engines to start and possibly flooded the muffler with gas caused ignition. But let me tell the shrapnel went everywhere. Everyone escaped unscathed including the boat. The muffler was in small pieces.
__________________

Scary is offline   Reply With Quote
Old 02-14-2014, 10:52 AM   #3
Guru
 
fryedaze's Avatar
 
City: Solomons Island Md
Country: USA
Vessel Name: Fryedaze
Vessel Model: MC 42 (Overseas Ltd) Monk 42
Join Date: Sep 2011
Posts: 1,052
Scary
I wont be using Vernatone tubing. I still have to figure out the supports. I was considering using the 1" bulkhead as a saddle but I think it would just add vibration and noise to the aft cabin. I will probably use straps. That sounded like someone got very lucky when that thing exploded.
How is the noise reduction with these mufflers?
Thanks
__________________
Dave Frye
Fryedaze, MC 42 (Monk 42') 1989 Overseas Co
http://mvfryedaze.blogspot.com/
fryedaze is offline   Reply With Quote
Old 02-14-2014, 11:08 AM   #4
Guru
 
Scary's Avatar
 
City: Walnut Grove Ca
Country: USA
Vessel Name: Cary'D Away
Vessel Model: Hatteras 48 LRC
Join Date: Apr 2012
Posts: 884
Risers

I'm assuming that the risers and lift to exhaust tubing will remain as before. Now is a good time to inspect your exhaust risers. Those turbos really don't like water.
Scary is offline   Reply With Quote
Old 02-14-2014, 12:03 PM   #5
Guru
 
Scary's Avatar
 
City: Walnut Grove Ca
Country: USA
Vessel Name: Cary'D Away
Vessel Model: Hatteras 48 LRC
Join Date: Apr 2012
Posts: 884
They have a nice sound.

These were behind 8v71s naturals so no turbo rush. Use hangers with rubber padding if possible. Isolate vibration from bulk heads or anything that can abrade the mufflers.
Scary is offline   Reply With Quote
Old 02-14-2014, 12:24 PM   #6
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,882
Not much vibration from the muffler itself. I don't think you will have problem hanging them. Best is to glass in a saddle to the hull/stringers, and put a layer of rubber sheet between saddle and muffler. A 6" vernatone should work well with a 6BT (figuring you have 210hp?).

I LOVE the sound of 6B motor with straight exhaust. For about five minutes. Kinda like a Harley.
Ski in NC is online now   Reply With Quote
Old 02-14-2014, 05:10 PM   #7
Guru
 
Brooksie's Avatar
 
City: Cape Cod, MA
Country: USA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 954
Don't forget to figure the weight of the water the mufflers will contain. Nylon webbing, like seatbelt size, makes a good, sound/vibration absorbing, hanger when securely attached with cleats above.
Brooksie is offline   Reply With Quote
Old 02-14-2014, 10:32 PM   #8
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 13,701
Ski in NC,
Harley's sound like an old farm tractor w bad manifold gaskets.

I think vibration should be isolated. The exhaust hangers on cars are flexible for that reason and the gas engines are smoother.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 02-14-2014, 11:35 PM   #9
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,882
Quote:
Originally Posted by manyboats View Post
Ski in NC,
Harley's sound like an old farm tractor w bad manifold gaskets.

I think vibration should be isolated. The exhaust hangers on cars are flexible for that reason and the gas engines are smoother.
Re: Harley's.. That's where the "five minutes" bit comes in. After five minutes, it is annoying.

With flexible hose between engine and muffler, a firm mounting to hull will not cause a vibe problem in the hull. Nothing significant. Hanging it can cause the overhead to become a diaphragm, which is worse for sound transmission.
Ski in NC is online now   Reply With Quote
Old 02-15-2014, 01:26 AM   #10
Senior Member
 
Jay N's Avatar
 
City: Edmonds, WA
Country: USA
Vessel Name: WESTERLY
Vessel Model: 1974 Pacific Trawler 37
Join Date: Oct 2007
Posts: 387
Just installed a Vernatone MKII Dual Stage Round Muffler behind a single 6BT5.9. It replaced a rubber Salisbury muffler that had hardened with age. Supported the muffler and all exhaust plumbing with rubber hose.

Recorded a reduction in sound of 3-7 dBa in the main cabin and aft deck. This was a significant improvement, although it increased exhaust resistance, but still well within engine tolerance.
Jay N is offline   Reply With Quote
Old 04-15-2014, 01:35 PM   #11
Guru
 
fryedaze's Avatar
 
City: Solomons Island Md
Country: USA
Vessel Name: Fryedaze
Vessel Model: MC 42 (Overseas Ltd) Monk 42
Join Date: Sep 2011
Posts: 1,052
Muffler project update

Well it was supposed to be easy!.............. I installed the port Vernatone MKII with only minor difficulty. The starboard turned into a nightmare. When I cut the exhaust hose I found the starboard hose has significant delaminating issues. It will all have to be replaced. It turned into a bigger job that I could handle at this time. I punted to the boatyard to replace. It will involve interference removal to get to the straps that hold the hose against the hull outboard of cabinetry. Nothing easy about htis one.
__________________
Dave Frye
Fryedaze, MC 42 (Monk 42') 1989 Overseas Co
http://mvfryedaze.blogspot.com/
fryedaze is offline   Reply With Quote
Old 04-15-2014, 04:41 PM   #12
Veteran Member
 
City: EASTHAMPTON, NEW YORK
Country: USA
Vessel Name: REFUGE
Vessel Model: Performance Trawler 35
Join Date: Jun 2012
Posts: 76
With my single engine in my sundeck boat, I was considering installing a Vernalift muffler by Centek as I wouldn't have the room for a longer "inline" Vernatone style muffler.
Bensjoy is offline   Reply With Quote
Old 04-15-2014, 05:07 PM   #13
Senior Member
 
Jay N's Avatar
 
City: Edmonds, WA
Country: USA
Vessel Name: WESTERLY
Vessel Model: 1974 Pacific Trawler 37
Join Date: Oct 2007
Posts: 387
Dave, If there was delamination of the hose, there was probably a loss of cooling water/high heat at some point and all hose on that side should be suspect.

Port side OK?
Jay N is offline   Reply With Quote
Old 04-15-2014, 06:50 PM   #14
Guru
 
fryedaze's Avatar
 
City: Solomons Island Md
Country: USA
Vessel Name: Fryedaze
Vessel Model: MC 42 (Overseas Ltd) Monk 42
Join Date: Sep 2011
Posts: 1,052
Quote:
Originally Posted by Jay N View Post
Dave, If there was delamination of the hose, there was probably a loss of cooling water/high heat at some point and all hose on that side should be suspect.

Port side OK?
The port side looked good and didnt have any signs of delamination. The starboard side had bubbles inside the hose, no signs on the outside of the hose. I will be replacing the entire length on the starboard side exhaust. I changed all hose on both engines this winter and didnt see any issues. The starboard side may have seen a heating event while the previous owner had the boat, no way to tell. The boat is a 1989 and the hoses are probably 25 years old.
__________________

__________________
Dave Frye
Fryedaze, MC 42 (Monk 42') 1989 Overseas Co
http://mvfryedaze.blogspot.com/
fryedaze is offline   Reply With Quote
Reply

Thread Tools
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 03:35 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012