Water-cooled dry exhaust ? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 
  #1  
Old 03-12-2011
Junior Member
 
Join Date: Mar 2011
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rickinnocal is on a distinguished road
Water-cooled dry exhaust ?

I have a strange hybrid dry / wet exhaust and wonder if anyone else has a similar set-up.

The boat is a 54' sloop rigged motorsailor with a 135 HP Ford Lehman diesel. The cooling is primarily a fresh water keel cooled system, but there is a sea water pump that provides cooling water to an oil cooler and transmission cooler, and to the exhaust.

The exhaust comes out of the back of the water jacketed manifold, and through about 12" of conventional dry exhaust pipe. At this point there is a 'collar' around the exhaust pipe into which the cooling water goes. Out of the collar come about 24 1/4" diameter copper pipes which are bundled around about another 12 feet of dry exhaust, all wrapped up together inside insulation. This exhaust line runs aft from the engine space into the space under the cockpit, then up to under the deckhead. At the top, the bundle of small lines go back into another collar, from which a single line carries the water into the muffler. From the muffler, conventional wet exhaust hose carries the wet exhaust out through the stern cabin into the transom.

Here's a sketch of the set-up...


The collar where the cooling water goes into the bundled pipes has rusted out, and the connector has broken away. I'd like to just go to a straight wet exhaust the whole way, but wonder why it was built this way to start with. The whole length of run is about 20' of 5" pipe.

Anyone got any input?

Richard
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 03-12-2011
Senior Member
 
Join Date: Jun 2004
Location: Malaysia
Posts: 314
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
haffiman37 is on a distinguished road
The biggest 'high riser' Ive seen.
Is engine far below waterline?
Might even be a way of reducing back pressure if distance from engine to exhaust outlet is long.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 03-12-2011
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,282
Thanks: 1
Thanked 29 Times in 29 Posts
Rep Power: 7
tommays will become famous soon enough
My A4 gas motor was done a bit like this as it was a common way at the time

__________________
1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 03-12-2011
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,964
Thanks: 10
Thanked 89 Times in 81 Posts
Rep Power: 15
RichH will become famous soon enough
This design exhaust system was very common until the 1980s when 'water lift' mufflers became popular. The 'jackets' were usually made of heavy copper and the 'stack' was vertical with the 'injection' water entering countercurrent (from the top) into the 'stack' .... the price of copper eventually made such design very expensive.

The only real problem in such 'wet stacks' is when a pin hole developed between the wet side and the dry side the leakage wasnt 'visible' and eventually would 'back flow' into the engine ... the shut down and 'cooling' engine developing vacuum and drawing the leaking 'stack water' into a combustion chamber - ouch.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Air, Water or Air / Water Cooled Refer Condensor OceanFreedom Gear & Maintenance 12 02-03-2011 01:35 AM
Water cooled air conditioners / water heaters graypenguin Gear & Maintenance 2 11-28-2010 03:40 PM
Raw water cooled issues? davidpm Diesel 5 11-10-2009 10:15 PM
Raw water cooled engines Neicy Gear & Maintenance 10 05-16-2005 01:14 AM
Raw-Water-Cooled Engine Mark Matthews Gear and Maintenance Articles 0 12-26-2001 08:00 PM


All times are GMT -4. The time now is 12:25 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.