I have tried this approach with Swamp Coolers.  These are those
evaporative water cooling units seen on houses in the dry
Southwest.  They corrode at a fast rate.  There is an item for
sale called a sacrificial anode.  The one I put in was an
aluminum bar with a wire screwed to the metal case.  This bar
sat in the water.  Mine collected a mass of gray matter.  I am
not sure how you would keep the tank clean of this gunk.

Bill

----- Original Message -----
From: Jerry Granito <VANAGONE@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, September 10, 1999 10:31 AM
Subject: Re: Z-Sticks

What if one was to "hang" a zinc rod or whatever in the coolant
tank, using a
piece of copper wire to hang it from. This wire could then be
attached to the
engine using an existing bolt, or ground wire mounting point. Of
course it
would be necessay to modify the cap for the coolant tank...
Any thoughts on this? Also, it would be easier to take a peek at
to see if
it's working, as opposed to removing the allen head bolt and
loosing coolant,
no?...

Jerry