To the best of my knowledge, surfactants (Water Wetter, dish detergent)
make a measurable difference. Even though it is just a few molecules
thick, the boundary region is critical and can determine whether or not
local boiling takes place. In any system where there is the potential
that petrochemicals (oil) can contaminate your cooling system, and coat
the base metal, surfactants are even more important. Considering how
cheap they are, it's a no-brainer in my book, and it certainly does no harm.
As I had posted awhile back, there is nothing magical about temperature
numbers, in and of themselves or relative to the engine block (read the
exception below). It's temperature relative to the boiling point of the
fluid. If you have any of the 215/3.5L displacement BOPR's, or any
other strong V8 (Ford, Chevy, etc.) you can switch your coolant
completely over to Propylene Glycol, which doesn't boil until 300 or 400
Deg F. and stop worrying about your temp gauge altogether. However, if
you have a 3.9, 4.0, 4.2 or 4.6 litre Rover block, the walls are just
too thin, and the higher temps will likely crack the block behind the
cylinder liner, so you must keep your temps under 190 Deg F., regardless
of the coolant you use.
James J.
Barrie Robinson wrote:
Bill,
Further to my previous email......
I have not seen any reliable data on the use of 'water-wetter'. All
it does is break down surface tension of the water and this removes a
minuscule 'blanket' of molecules. The difference I suspect is not
measurable.
Have you ceramic coated your exhaust manifold ?
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