rad and coolant, TPEFI related

George M. Dailey gmd at tecinfo.com
Wed Oct 22 00:03:57 GMT 1997


I can vouche for this personally, I got "smart" and put a 160f thermostat in
my GM TPEFI and it fell flat on it's face as far as economy goes. Put the
195f back in and magic, no problem. Now I have thoughts of running it right
at 219F, just below fan turn on temp. A kind gent sent me some info on just
what it takes to run at the high temps. He mentioned a guy that ran an
engine temp of 250 or 300F, I think. The main problem was he had to use 100%
pure ethylene glycole with no water what so ever. Water would flash to steam
and create abnormally high radiator pressures.

Aint it cool'
GMD

At 10:27 AM 10/20/97 -0700, you wrote:

>I've seen pretty much the same thing in a graph. The interesting thing
>...Basically the wear curve goes down
>the hotter it gets, and gets flatter as it goes. At 180* it's pretty
>close to flat, at 195(gm stock thermo) it's nearly nonexistant.
>Anyhow, my approach was to say the hell with the little bit of difference
>in wear between 180*&195* because I feel that 195 turns seals into
>bakelight which cuts grooves in the shaft and leaks oil which shortens
>engine life Real fast if you're one that insists that engine's shouldn't
>have to be checked for oil between reasonable changes.(if ya can't put
>them together better than that ya better have somebody else do it!:-)
>160* is still to high in the wear dept for me to be comfortable with.
>
>  With all this about something as simple as a cooling system, it's
>not hard to understand why we haven't gotten far on efi...:-)
>
>
>
George M. Dailey
gmd at tecinfo.com




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