Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-02-2011, 17:56   #1
Registered User
 
irwin28's Avatar

Join Date: Apr 2009
Location: Pensacola FL
Boat: Fuji 32 Ketch
Posts: 118
Send a message via MSN to irwin28
Wiring Zinc to Engine Block

Hi folks, I know a lot if people do this and I just did myself, but does say wiring a zinc to a bolt or something on your engine block and dropping it in the water help with electrolysis? Doing this cos my zincs are going fast at this marina. I'm hauling it out anyway this spring to replace them and do a bottom job so my and my girlfriend can go cruising. Thanks!
__________________

__________________
irwin28 is offline   Reply With Quote
Old 08-02-2011, 18:05   #2
CF Adviser
 
Intentional Drifter's Avatar

Cruisers Forum Supporter

Join Date: Apr 2006
Location: Pac NW
Boat: Boatless, for now, Cat enthusiast
Posts: 1,283
I've done it, too. I got stuck with the boat in a situation where I knew it was overdue, a diver confirmed that the old ones were 90 to 95% gone and I knew I couldn't get it hauled out for another two months, at the earliest. By the time I did get it hauled out, my saildrive zincs were totally gone, but there was no corrosion damage and everything was fine.

Besides, it can't hurt! (Unless you forget they are there before taking off.)

ID
__________________

__________________
Intentional Drifter

Observations are gold; hypotheses, silver; and conclusions, bronze.

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote.--Ben Franklin

Everyone is entitled to their own opinion, but not their own facts.--Daniel Patrick Moynihan
Intentional Drifter is offline   Reply With Quote
Old 08-02-2011, 18:09   #3
Registered User
 
irwin28's Avatar

Join Date: Apr 2009
Location: Pensacola FL
Boat: Fuji 32 Ketch
Posts: 118
Send a message via MSN to irwin28
Thanks Drifter, I wired it to a bolt that is used to hold the pad eye that you use to lift the engine out with, should that be good enough?
__________________
irwin28 is offline   Reply With Quote
Old 08-02-2011, 18:53   #4
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,767
I just attach ours to the negative post of the starter battery, works fine there, so the lifting eye should be more than adequate
__________________
Sailmonkey is offline   Reply With Quote
Old 08-02-2011, 20:20   #5
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,592
Quote:
Originally Posted by Sailmonkey View Post
I just attach ours to the negative post of the starter battery...
What, precisely, are you protecting by doing that?
__________________
fstbttms is offline   Reply With Quote
Old 08-02-2011, 20:47   #6
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,767
Well, if the negative post of the starter battery is connected to the engine block...........I'd suppose I'm protecting the engine and all the other underwater stuff hooked to it. Unless you're going to tell me the electrons don't flow through the cable as well as the one connected to the zinc guppy.
__________________
Sailmonkey is offline   Reply With Quote
Old 08-02-2011, 20:54   #7
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,592
Quote:
Originally Posted by Sailmonkey View Post
Well, if the negative post of the starter battery is connected to the engine block...........I'd suppose I'm protecting the engine and all the other underwater stuff hooked to it. Unless you're going to tell me the electrons don't flow through the cable as well as the one connected to the zinc guppy.
Unless your engine is under water, you are not protecting it with this arrangement. Both the zinc and the item being protected must be submerged in an electrolyte, if the zinc is to provide protection. It is possible that you are providing some protection to your running gear, but only if there is a direct electrical connection to the zinc. A drivesaver or similar device (if you have one) negates that. Further, the greater the length of the path between the zinc and the item being protected, the less effective it is. And you have a pretty long path.
__________________
fstbttms is offline   Reply With Quote
Old 08-02-2011, 20:58   #8
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,767
Quote:
Originally Posted by fstbttms View Post
Unless your engine is under water, you are not protecting it with this arrangement. Both the zinc and the item being protected must be submerged in an electrolyte, if the zinc is to provide protection. It is possible that you are providing some protection to your running gear, but only if there is a direct electrical connection to the zinc. A drivesaver or similar device (if you have one) negates that. Further, the greater the length of the path between the zinc and the item being protected, the less effective it is. And you have a pretty long path.
Thanks for the obvious
but it does work
prop to zinc, through trans, engine, neg lead <3OHM
guppy to prop approx 6"
__________________
Sailmonkey is offline   Reply With Quote
Old 08-02-2011, 20:59   #9
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,592
Quote:
Originally Posted by Sailmonkey View Post
Thanks for the obvious
Sorry. Didn't realize you were a corrosion control expert.
__________________
fstbttms is offline   Reply With Quote
Old 08-02-2011, 21:02   #10
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,767
Not a corrosion control expert, but I did study some corrosion engineering in school.

I know it's not perfect, but nobody said is was.

out........
__________________
Sailmonkey is offline   Reply With Quote
Old 08-02-2011, 21:02   #11
Registered User
 
irwin28's Avatar

Join Date: Apr 2009
Location: Pensacola FL
Boat: Fuji 32 Ketch
Posts: 118
Send a message via MSN to irwin28
Fastbottoms, so If I have a 12' line between my zinc and my motor that my odds are pretty slim that I am actually protecting my engine? Well, I'm just assuming thats what you mean.
__________________
irwin28 is offline   Reply With Quote
Old 08-02-2011, 21:49   #12
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,592
Quote:
Originally Posted by irwin28 View Post
Fastbottoms, so If I have a 12' line between my zinc and my motor that my odds are pretty slim that I am actually protecting my engine? Well, I'm just assuming thats what you mean.
Zincs are mounted directly to the item being protected for a reason.
__________________
fstbttms is offline   Reply With Quote
Old 08-02-2011, 22:01   #13
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,745
Images: 9
Quote:
Originally Posted by fstbttms View Post
Sorry. Didn't realize you were a corrosion control expert.
I'm really amazed you get any business the way you speak to people on line. this isn't the first time I've been inclined to write a comment like this.
__________________
Fair Winds,

Charlie

Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie is offline   Reply With Quote
Old 08-02-2011, 22:37   #14
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,592
Quote:
Originally Posted by Charlie View Post
I'm really amazed you get any business the way you speak to people on line. this isn't the first time I've been inclined to write a comment like this.
Imagine how much sleep I lose worrying about what you think.
__________________
fstbttms is offline   Reply With Quote
Old 08-02-2011, 22:54   #15
cruiser

Join Date: Jan 2010
Posts: 1,129
come on guys, settle down...

I think the intent or reasoning is to place teh zinc as close to the item being protected as possible...if you just bond things like the way described, then the times closer to the zin will have less corrosion then the items further from the zinc..

i am not totally familiar with the technical aspect.. but from what i see on some of teh schematics there must be a reason there are 'separate' ground busses but yet they all connect...each closer to the point of use...

so, I follow that theory to the corrosion aspect... and zincs are mounted to shafts, and any exposed surfaces, and any not submerged items are connected with as large as conductor with the least amount of distance...

just my theory...

you can yell at me and tell me how dumb i am, and stop arguing with each other...
__________________

__________________
Bergovoy is offline   Reply With Quote
Reply

Tags
engine, wiring

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
Where's My Zinc ? lowride14 Construction, Maintenance & Refit 18 08-12-2010 16:54
Zinc Anode yoraby Construction, Maintenance & Refit 5 02-11-2010 19:06
How Much Protection Does Prop Zinc Offer Engine Cooling System ? yamaha30c Engines and Propulsion Systems 4 07-06-2010 14:28
Nanni Zinc noelex 77 Engines and Propulsion Systems 0 26-05-2010 23:14
Zinc Question Charlie Construction, Maintenance & Refit 8 15-10-2008 13:54



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:05.


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.