Message text written by "Roy"
>Second, reduce or eliminate free oxygen by mixing in certain chemical
compounds that "strip" free oxygen. Without free oxygen, it is very
difficult to form oxides (various forms of "rust" where oxygen has combined
with the base metals). You also would want to eliminate any air from the
system (so limit free oxygen -- not necessarily practical in a car since
you
have to then have a way to compensate for the expansion/contraction of the
coolant with temperature -- the water expansion can burst things).
<
Roy,
TR6's and all the "new" TR's had a coolant recovery system that will retain
all excess coolant in a recovery bottle with the net effect of keeping the
cooling system "air free." This may be done for the reason you point out
here.
The TR7's and 8's (as well as my Ford Tarus) have a pressurized expansion
tank that sequestures any air in a small tank constructed of copper (in the
case of the TR's and plastic in the case of the Tarus).
Dave
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