Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 01-11-2009, 14:10   #1
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Exhaust System Diagram (New System)

I invite comments concerning my new design. Still a question about a valve for breaking waves over the port side but I think this should prevent water intrusion without a valve.
Thanks.
Attached Thumbnails
Click image for larger version

Name:	Exhaust System 3.jpg
Views:	3635
Size:	60.8 KB
ID:	10826  
__________________

__________________
John
SkiprJohn is offline   Reply With Quote
Old 02-11-2009, 06:29   #2
Marine Service Provider

Join Date: Aug 2008
Location: North Carolina
Posts: 252
Hello John,
This looks like a good and safe system. If you want, you could fit an exhaust thru-hull with a flap and turn it through 90 degrees to get the hinge at the forward side of the circle. This way, it should be closed when you are sailing.
Good luck, Stanley
__________________

__________________
NCboatrx is offline   Reply With Quote
Old 02-11-2009, 07:38   #3
Registered User

Join Date: Feb 2009
Posts: 1,321
SkiprJohn

why the SS tube? a suitable rubber hose will be better at absorbing vibration and movement between the motor and the water lifter and does not rust.
__________________
chala is offline   Reply With Quote
Old 02-11-2009, 08:12   #4
Registered User

Join Date: Aug 2006
Location: Leucadia, California
Boat: Stevens 47 Komaru
Posts: 428
SkiperJohn, I thought the max height from the bottom of the waterlift to the goose neck was 42". There is a diagram on page 379 of Nigel Calders book Boatowners and Mechanical Manual. Looks like you are using Vetus parts I had a look in their catalog looks like they are showing a max of 5' so a discrepancy occurs.
__________________
Stevens 47 is offline   Reply With Quote
Old 02-11-2009, 08:25   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Seattle
Boat: Cal 40
Posts: 2,401
Images: 7
Practical Sailor says a max rise of 33" to prevent excessive backpressure.

Pick your favorite authority, but you're above the max on the most liberal in a situation where less back pressure is better short of not having the loop high enough.

This article, as well as Calder's book also shows how to mount the muffler higher.

http://www.practical-sailor.com/mari...iftmuffler.pdf

John
__________________
cal40john is offline   Reply With Quote
Old 02-11-2009, 08:31   #6
Registered User
 
Stillraining's Avatar

Join Date: Oct 2008
Location: Puget Sound
Boat: Irwin 41 CC Ketch
Posts: 2,876
Quote:
Originally Posted by chala View Post
SkiprJohn

why the SS tube? a suitable rubber hose will be better at absorbing vibration and movement between the motor and the water lifter and does not rust.
Agreed...your asking for trouble here IMHO
__________________
"Go simple, go large!".

Relationships are everything to me...everything else in life is just a tool to enhance them.
Stillraining is offline   Reply With Quote
Old 02-11-2009, 10:44   #7
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Thanks to all who responded for the the comments.

I checked the Vetus recommended height from base of waterlift to top of gooseneck and they say it should be no more than 150 cm (59"?) which I translated incorrectly. I'll definitely lower the gooseneck. That makes the angle to the outlet a bit less but still doable.

I will try to find rubber exhaust hose that is flexible enough to make the bends I need. Stainless tubing can be bent to the proper angles. Anyone have a brand or fitting recommendation for the exhaust hose? I have to order everything via catalog.

Thanks CalJohn, I did consult that article before taking the Vetus recommendation as authority. 59" inches is probably a bit too high and 33" might be a bit too low and I'll try to find a happy medium.
__________________
John
SkiprJohn is offline   Reply With Quote
Old 02-11-2009, 11:19   #8
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,596
Images: 240
If you find that you must use pipe to effect the necessary bends, add a flexible hose nipple at each end (muffler & hull), for vibration isolation.

Trident ➥ Trident Marine: Wet Exhaust Hose
Gates ➥ Gates Industrial Marine Transfer Wet Exhaust Hose
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 02-11-2009, 12:25   #9
Registered User
 
sailvayu's Avatar

Join Date: Mar 2006
Location: Fort Myers FL
Boat: Irwin 40
Posts: 878
I have to agree with the others and lose the SS tube from the engine to the lift. if you can draw an imaginary heeled water line at what you think would be your max heel. Say decks awash half way. If you place the top of the LT a inch or so above that what would that give you as a hight above the waterlock? If it is with in limits that is where I would put it. If not might need to make so other changes. I have always used 48" as a rule of thumb and have not had problems with that.

Wayne Cannig AMS\projectboatzen.com
__________________
sailvayu is offline   Reply With Quote
Old 02-11-2009, 17:27   #10
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Thanks to all for the replies. All great ideas and comments. I will do as you suggest. I talked with a power boat builder here in town and he says that vernatube is a pretty good product for exhaust systems using hose on both ends for flex.
regards,
__________________
John
SkiprJohn is offline   Reply With Quote
Old 02-11-2009, 19:47   #11
Registered User

Join Date: Aug 2006
Location: Leucadia, California
Boat: Stevens 47 Komaru
Posts: 428
If you want a hard section you can use fiberglass tubing. Cut it to the angles that you want glue it with hot glue gun then wrap the bend with cloth and epoxy. That should cost you less than a SS section. I am fabing a complex section into my exhaust system using this method. I agree with Gords suggestion of using flexible hose to join hard sections. Connectors
__________________
Stevens 47 is offline   Reply With Quote
Old 02-11-2009, 21:23   #12
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
For Stevens 47,
I've been looking for fiberglass tubing and have not found a source yet. What you suggested is exactly what my power boat guy suggested. Could you give me a clue as to which catalog company has tubing available?
Tomorrow I'm calling Fisheries up in Seattle to see if they can send some.
Thanks
__________________
John
SkiprJohn is offline   Reply With Quote
Old 02-11-2009, 21:35   #13
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Seattle
Boat: Cal 40
Posts: 2,401
Images: 7
Fire resistant fiberglass tubes and fittings by the same company that makes Centek mufflers.

Centek Industries - Products

Search of Centek at Fisheries. They seem to carry most of the Centek line.

Fisheries Supply Search: centek

John
__________________
cal40john is offline   Reply With Quote
Old 02-11-2009, 21:40   #14
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Thanks John. I'll be calling around tomorrow. I'd certainly like to find a source that will sell me less than 10ft and use USPS to mail it to me. Even though there is water all around me there aren't any marinas or significant marine stores within 100 miles. I need 2" and most catalogs don't show it.
regards,
__________________
John
SkiprJohn is offline   Reply With Quote
Old 03-11-2009, 08:18   #15
Registered User

Join Date: Aug 2006
Location: Leucadia, California
Boat: Stevens 47 Komaru
Posts: 428
I buy it through San Diego Marine Exchange. San Diego Marine Exchange: marine products, marine equipment, marine they will cut it to the length you require.
__________________

__________________
Stevens 47 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
A Valve in Exhaust System SkiprJohn Engines and Propulsion Systems 13 03-11-2009 12:27
Perkin4236Change exhaust to new rubber system indypopeye Engines and Propulsion Systems 6 17-12-2008 23:56
best system? beau Electrical: Batteries, Generators & Solar 5 25-02-2007 22:09
Exhaust System Maintenance GordMay Engines and Propulsion Systems 9 02-12-2004 21:16



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:31.


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.