> We need a marine engineer who specializes in this on the list! Right so a professor of some kind of engineering will probably do... Go to the archives (it's not really that painful) and do a search for crevice corrosion with author Tim Smith (did I spell crevice correctly?). He did a nice write up on a very good explanation of why the _ONLY_ portion of the head that pits is that which is under the rubber gasket (if this was solely electrolysis, the pitting would be worst at the point where the coolant flows from thru the head - where it can pick up ions, not under the protected and insulate surface of the rubber gasket). There might be an electrolic portion of head corrosion but it is not the main reason the heads pit under the rubber gasket. I write this once every 6 months - once everytime this thread comes up.... Maybe I can make procmail figure out when this thread is starting again and automaticly send this out again (and maybe a couple more people will actually go read Tim's discussion of the elements at work here). dave |
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