Re: Water in oil

Posted by Vern-MI on November 11, 2006 at 11:37:08 from (207.69.138.8):

In Reply to: Water in oil posted by 37 chief on November 11, 2006 at 10:41:21:

You have cavitation corrosion and it can be fixed by maintaining coolant at the correct pH level to prevent cavitation corrosion (rust) – the natural way in which metal converts back to its original ore form. Liner cavitation-erosion occurs along the thrust angle of the piston, especially in engines with wet liners. The liner sits inside the block and rings like a bell when the piston compresses and fires, causing intense pressure changes at the cylinder wall that result in liner cavitation. Liner cavitation, or pitting, is avoided by using an engine coolant with a nitrate component as it forms a monomolecular ultrathin oxide coating around the liner.

The pH should be maintained at levels between 7 and 8.5 in engines with soft and harder metals. A pH of below seven is more acidic and aggressive to harder metals, like cast iron or steel, while a pH above 8.5 becomes more alkaline to soft metals such as aluminium, copper and brass. It is therefore important to incorporate a coolant with a pH buffer, such as borate, to regulate the pH in coolant at safe levels. Approved coolant manufacturers offer fully formulated coolants that afford wet liner protection without the need to add extra additives.

Coolant dilution is an absolute must. If coolant concentrations was changed to 70% coolant and 30% water, the heat-transfer value would go up while corrosion protection will drop drastically.

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