Re: re: Evans (zero pressure) coolant

[KSMITH1@mailgw.sanders.lmco.com]

Huw Powell <human@nh.ultranet.com> wrote, and I reply:

     1.  If the coolant gauge is pegged, because in the engine the coolant is
     hotter, will the heater work better?  (a big plus here in the NE USA)

Probably, if the thermal conductivity is roughly as good as the usual 
water-antifreeze mixture.

     2.  Is it possible to obtain a different coolant temp sender (or gauge)
     that will put the operating temp in the middle of the scale?

You could just put a resistor in series with it to rescale the output to a value
you liked on the meter.

     From what brian said, the coolant is hotter in the engine, but the metal
     is cooler, then I assume the coolant gets cooler than normal AF in the
     radiator due to better heat transfer... Am I correct?  What role does
     the thermostat play in this?

The coolant is low pressure because it doesn't boil at the temperature it 
obtains performing its cooling function.  This likely requires it to get hotter 
to compensate for its likely lower specific heat, and possible lower thermal 
conductivity.  If it is hotter, more heat (BTUs, cals, joules) will be exchanged
at the radiator per unit time if the thermal conductivity is close to that of  
water-antifreeze.  The thermostat, as always, lets the engine warm up sooner 
and/or warm up at all, depending on the ambient temperature and load.

***                 ...Kirby    (Kirby A. Smith)                 ***
***                      2 X 1988 90q                            ***
***              ksmith1@mailgw.sanders.lmco.com                 ***
***              [=]   kirby.a.smith@lmco.com                    ***
***  Opinions expressed herein are entirely those of the author. ***