Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-04-2015, 20:03   #16
Registered User
 
deblen's Avatar

Join Date: Oct 2014
Location: Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 1,400
Images: 1
Re: Wet exhaust- which metal?

Quote:
Originally Posted by roverhi View Post
300 series Stainless can work harden and crack if exposed to vibration especially in the corrosive environment of an exhaust. Think I'd stick with galvanized or un galvanized Iron pipe for cost and reliability. It will eventually corrode through but life span in measured in decades in most applications.

Getting Yanmar exhausts apart is a real bitch. Had to call in a mechanic to disassemble mine because it needed a humongous vise strong enough to clamp it in place so he could unscrew the pieces with an equally humongous pipe wrench and heating to a cherry red with an acetylene torch.
Mount the flange in a good vise.Rig a hacksaw so the blade goes thru the nipple.Hacksaw 2 slots about an inch apart & lengthways the nipple til you just about touch the flange threads.Put the nipple in the vise,cold chisel the one inch strip out,& then crush the nipple a bit with vise.
I agree-black iron nipple is the traditional thing to use & replace it every 2 yrs.
__________________

__________________
My personal experience & humble opinions-feel free to ignore both
deblen is offline   Reply With Quote
Old 06-04-2015, 22:29   #17
Registered User
 
UNCIVILIZED's Avatar

Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
Re: Wet exhaust- which metal?

For anything steel, stainless & non, it's worth having the parts salt bath nitride. It GREATLY increases corrosion & wear resistance. As in several fold on some parts. Due to the process converting the outer layer of the metal, several molecules thick, into a hyper wear resistant alloy that rates about 80 on the Rockwell scale.
It may work on iron parts also, I'm not sure. One would need to check with a metallurgist.
__________________

__________________
UNCIVILIZED is offline   Reply With Quote
Old 07-04-2015, 06:23   #18
Registered User
 
Mainstay's Avatar

Join Date: Aug 2008
Location: Ft Lauderdale
Boat: Fountaine Pajot Venezia 42 Owner's Ver.
Posts: 37
Re: Wet exhaust- which metal?

i would get in touch with Deangelo Marine exhaust in Fort Lauderdale and ask them the same question. i know they use Monel for the systems they build.
__________________
Mainstay is offline   Reply With Quote
Old 08-04-2015, 07:27   #19
Registered User

Join Date: Feb 2011
Posts: 55
Re: Wet exhaust- which metal?

I know I am not a boat expert but, after studying the assembly diagram I have to ask if any of the bolts have been replaced. Because there are gaskets isolating the bigger major parts the only other way of getting galvanitic corrosion is from charges being transferred through the flange bolts, washers, and nuts. This could cause the action thaat you are seeing on the elbow.
__________________

__________________
mholtzberg 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
Which Heat Conductive Material to Boost My Exhaust Heat Exchanger? Exhaust Shanaly Plumbing Systems and Fixtures 4 05-07-2013 04:58
PVC Pipe for a Wet Exhaust ? SabreKai Engines and Propulsion Systems 10 02-11-2011 08:29
For Sale: 2" Shieldsflex II Marine Wet Exhaust Hose gettinthere Classifieds Archive 0 10-02-2011 14:42
Wet Exhaust Issues medmd2010 Powered Boats 6 26-12-2010 20:39
Copper Wet Exhaust Soot Cleaning? Oatman Construction, Maintenance & Refit 6 28-02-2010 15:11



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:04.


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.