Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-06-2014, 22:12   #1
Zai
Registered User

Join Date: Mar 2011
Location: Athens
Boat: 2011 Bavaria 36 Cruiser
Posts: 144
Vetus Exhaust

I haver a Merry Fisher 655 with a 105hp Yanmar.
I would like to change the wet exhaust. The current exhaust is a VETUS plastic waterlock type LP75. With the boat purchase I recieved a new exhaust in the box. When I opened it I found that it was the next size up (105mm instead of 75mm)

Can anyone think of a reason it would not work to just weld a couple of adaptors in stainless or aluminum?

Any advice?
__________________

__________________
Zai is offline   Reply With Quote
Old 06-06-2014, 23:10   #2
Registered User
 
nimblemotors's Avatar

Join Date: Apr 2011
Location: Sacramento, California
Boat: Solar 40ft Cat :)
Posts: 1,557
Re: Vetus exhaust

If this is after the manifold, I would not think there would be any problem using a larger diameter exhaust.

Quote:
Originally Posted by Zai View Post
I haver a Merry Fisher 655 with a 105hp Yanmar.
I would like to change the wet exhaust. The current exhaust is a VETUS plastic waterlock type LP75. With the boat purchase I recieved a new exhaust in the box. When I opened it I found that it was the next size up (105mm instead of 75mm)

Can anyone think of a reason it would not work to just weld a couple of adaptors in stainless or aluminum?

Any advice?
__________________

__________________
JackB
MiniMPPT Solar Controller
nimblemotors is offline   Reply With Quote
Old 08-06-2014, 16:42   #3
Registered User
 
Neeltje's Avatar

Join Date: Mar 2014
Location: Saint Augustine, Florida
Boat: 1902 Dutch Tjalk, 64'
Posts: 297
Re: Vetus exhaust

The next size up from the LP 75 is the LP 90 (90 mm / 3.5"). The LP 90 is what I have on my 90 HP Lehman, so it shouldn't be overkill on yours.

The only issue you might conceivably come across would be with bending the 3.5" hose. It's exponentially stiffer than the 3" (75 mm) you've got on there now.

Jacques
__________________
Neeltje is offline   Reply With Quote
Old 08-06-2014, 16:47   #4
Registered User
 
Neeltje's Avatar

Join Date: Mar 2014
Location: Saint Augustine, Florida
Boat: 1902 Dutch Tjalk, 64'
Posts: 297
Re: Vetus exhaust

PS - I was assuming you intended to go with the 90 mm hose that fits the waterlock, but after re-reading your post, methinks I was assuming wrong.

Jacques
__________________
Neeltje is offline   Reply With Quote
Old 08-06-2014, 23:01   #5
Zai
Registered User

Join Date: Mar 2011
Location: Athens
Boat: 2011 Bavaria 36 Cruiser
Posts: 144
Re: Vetus Exhaust

I guess I have two sizes up then, as it is 100 mm.
Yesterday I was test fitting it and noticed what you are saying, so I think I will just weld the adapter to the correct angle.
The existing 75 mm hose goes through a hole in the bulkhead and then bends down at about a 45 degree angle. My thought is if I weld the correct angle it will save me the headache of bending either hose.
I will compare it to the original one more time, as I am a little concerned that if it is too much taller than the 75mm, it could be a problem. I am concerned that the height of the intake side will be too high and allow backwash into the motor?
__________________
Zai is offline   Reply With Quote
Old 09-06-2014, 00:41   #6
Zai
Registered User

Join Date: Mar 2011
Location: Athens
Boat: 2011 Bavaria 36 Cruiser
Posts: 144
Re: Vetus exhaust

Quote:
Originally Posted by Neeltje View Post
The next size up from the LP 75 is the LP 90 (90 mm / 3.5"). The LP 90 is what I have on my 90 HP Lehman, so it shouldn't be overkill on yours.

The only issue you might conceivably come across would be with bending the 3.5" hose. It's exponentially stiffer than the 3" (75 mm) you've got on there now.

Jacques
After thinking (which allways comes after the fact ) I went out and actually looked at the exhaust and you are right it is an LP 90.

Also I found on the Defender web site installation instructions and it appears that both the 75 and 90 have the same physical dimensions.

Thanks for your post!
__________________
Zai is offline   Reply With Quote
Old 09-06-2014, 03:53   #7
Registered User
 
Neeltje's Avatar

Join Date: Mar 2014
Location: Saint Augustine, Florida
Boat: 1902 Dutch Tjalk, 64'
Posts: 297
Re: Vetus Exhaust

Quote:
Originally Posted by Zai View Post
I guess I have two sizes up then, as it is 100 mm.
Yesterday I was test fitting it and noticed what you are saying, so I think I will just weld the adapter to the correct angle.
The existing 75 mm hose goes through a hole in the bulkhead and then bends down at about a 45 degree angle. My thought is if I weld the correct angle it will save me the headache of bending either hose.
I will compare it to the original one more time, as I am a little concerned that if it is too much taller than the 75mm, it could be a problem. I am concerned that the height of the intake side will be too high and allow backwash into the motor?
I used fiberglass elbows on mine. Since the boat is still on the hard, I haven't run the engine since, but they seem pretty sturdy.
You're right to be concerned about siphoning. Common practice is to put the waterlock muffler at the lowest point in the exhaust run, but since I'm a firm believer in Gravity, I used a 2 FT tall exhaust riser to make sure I'd have a slope all the way to the through-hull.
Attached Thumbnails
Click image for larger version

Name:	Neeltje exhaust riser.jpg
Views:	200
Size:	409.9 KB
ID:	82715   Click image for larger version

Name:	Neeltje waterlock.jpg
Views:	408
Size:	398.2 KB
ID:	82716  

__________________

__________________
Neeltje is offline   Reply With Quote
Reply

Tags
exhaust

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Vetus Exhaust for Tight Engine Bay vet222 Engines and Propulsion Systems 24 21-07-2017 06:53
Which Heat Conductive Material to Boost My Exhaust Heat Exchanger? Exhaust Shanaly Plumbing Systems and Fixtures 4 05-07-2013 04:58
For Sale: Wet Exhaust Boat Muffler Vetus Waterlocks NLP mtbdude7 Classifieds Archive 6 10-10-2012 17:36
Exhaust Not Emitting Enough Water with Exhaust swahealy2 Engines and Propulsion Systems 24 13-06-2011 11:08
Vetus Diesel?? jemsea General Sailing Forum 7 24-06-2005 14:07



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:48.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.