Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-02-2017, 07:57 AM   #1
Guru
 
angus99's Avatar
 
City: Signal Mtn., TN
Country: US
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 2,134
Which vented loop?

I need to install new vented loops on the Lehman exhausts. Someone has recommended the Vetus models, which are some sort of composite or high-end plastic. Groco also makes a very substantial bronze model. Does anyone have experience with either of these . . . or other recommendations?

Second question: do most of you route the air bleed lines overboard or back to the water lift muffler, as they are on my boat?
Attached Thumbnails
Click image for larger version

Name:	IMG_5016.jpg
Views:	79
Size:	53.7 KB
ID:	66361   Click image for larger version

Name:	IMG_5017.JPG
Views:	90
Size:	38.2 KB
ID:	66362  
__________________
Advertisement

angus99 is online now   Reply With Quote
Old 07-02-2017, 11:29 AM   #2
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,852
I bought the Vetus as it doesnt need to be complex or robust.

I bought the Vetus model with the overboard discharge line, no vacuum breaker valve as they are known to stick shut with hot salt water deposits.

The Vetus was also smaller in size so that was nice.

I have mixed feelings on the through hull discharge. The water flow near a door is nice to check, but the water stain down the hull is annoying. I have to fashion a drip lip to hopefully lessen that.
__________________

psneeld is online now   Reply With Quote
Old 07-02-2017, 11:49 AM   #3
Guru
 
djmarchand's Avatar
 
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,782
There are two types of vented loops. One has a simple high point vent which is usually routed overboard because you have flow any time the engine is running. The other has a check valve that lets air in to break a vacuum but keeps normal flow inside. Yes, the second type can fail, but they mostly fail open which is mostly safe but messy.

A reasonable approach is to use the check valve type but hook up a hose to the valve that is routed to the bilge. Check that hose periodically for flow and if you see it, then clean the check valve.

David
djmarchand is online now   Reply With Quote
Old 07-02-2017, 12:01 PM   #4
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,852
But they can fail closed, allowing a major issue with backsiphoning to the engine.... so why chance it?

All the reading I have done recommends no valve for that reason, simple risk managenment.
psneeld is online now   Reply With Quote
Old 07-02-2017, 12:45 PM   #5
Guru
 
angus99's Avatar
 
City: Signal Mtn., TN
Country: US
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 2,134
Anything wrong with routing the vent line back to the water lift muffler, as several Defevers seem to do? The muffler obviously vents to atmosphere and any water that gets in would be expelled with the rest of the water/exhaust mixture.
angus99 is online now   Reply With Quote
Old 07-02-2017, 12:50 PM   #6
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,852
As long as when the engine shuts down, the tube will be vented to the atmosphere and not suck back water.
psneeld is online now   Reply With Quote
Old 07-02-2017, 03:19 PM   #7
Senior Member
 
SeaMoose's Avatar
 
City: Anchor Pointe, Ohio
Vessel Name: Sea Moose
Vessel Model: 1976 34' D/C Taiwanese Trawler
Join Date: Oct 2007
Posts: 254
Pardon my ignorance here, both boats I have owned with Lehmans did not have these, I thought that was the purpose of the water lift muffler? Where in the exhaust are they installed?
SeaMoose is offline   Reply With Quote
Old 07-02-2017, 03:52 PM   #8
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,852
Just prior to water injection elbow in exhaust.

Simplified version....

They are only needed if part of the raw water system is lower than or close to the waterline. To the point where if you shut down under the right circumstances, the system could siphon water into the exhaust system and fill the engine.
psneeld is online now   Reply With Quote
Old 07-13-2017, 10:02 PM   #9
Guru
 
angus99's Avatar
 
City: Signal Mtn., TN
Country: US
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 2,134
I decided to go with the Vetus vented loops. Each loop, as before, vents to the respective muffler. The blue line is the injection source for the stuffing box. People seem to like the Vetus loops, but they seem grossly over-priced for a piece of plastic . . . oh, wait; it's a boat . . .
Attached Thumbnails
Click image for larger version

Name:	4FDF0E48-0072-42E4-B169-EF322C649B96.jpg
Views:	54
Size:	150.5 KB
ID:	66728  
angus99 is online now   Reply With Quote
Old 07-13-2017, 11:34 PM   #10
Guru
 
Sailor of Fortune's Avatar
 
City: Florida
Country: usa
Vessel Model: "Ho"made
Join Date: Sep 2009
Posts: 2,778
Ian, Don't worry about the cost (love spending other peeps money!), it complements an already pretty engine room. D44 have a really nice engine room!

Angus99 has a beautiful engineroom setup. Clean and orderly prepurchase. I'm sure its even nicer now.
Sailor of Fortune is online now   Reply With Quote
Old 07-14-2017, 04:43 AM   #11
Guru
 
Lou_tribal's Avatar
 
City: Quebec
Country: Canada
Vessel Name: Bleuvet
Vessel Model: Custom Built
Join Date: Jan 2016
Posts: 3,493
Shouldn't you double clamp your hoses?

L.
Lou_tribal is offline   Reply With Quote
Old 07-14-2017, 07:25 AM   #12
Guru
 
angus99's Avatar
 
City: Signal Mtn., TN
Country: US
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 2,134
Quote:
Originally Posted by Sailor of Fortune View Post
Ian, Don't worry about the cost (love spending other peeps money!), it complements an already pretty engine room. D44 have a really nice engine room!

Angus99 has a beautiful engineroom setup. Clean and orderly prepurchase. I'm sure its even nicer now.
Thanks, Jack. It was your initial impression of the boat that gave us the confidence to make an offer. You got to spend a lot of our money that day.

Quote:
Originally Posted by Lou_tribal View Post
Shouldn't you double clamp your hoses?

L.
Good eye, Lou. I couldn't find enough room on the Vetus for two clamps. However, it is secured to the boat with stout number 12 screws and the cushioned hose clamps below it exert considerable resistance against the hoses blowing downward. In addition, these are not high-pressure lines. Most of the raw water hoses on my engines are single-clamped. I'm slowly converting everything to Awab clamps and will be double clamping where that is advisable and possible.
angus99 is online now   Reply With Quote
Old 07-14-2017, 07:36 AM   #13
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,852
Plus, not under the waterline where double clamping is recommended.
__________________

psneeld is online now   Reply With Quote
Reply

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 09:23 AM.


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
×