Are we sure about the "old" values?
I checked my circa 1974 Prestone hydrometer and found this: "(-34F)
50% concentration recommended (-37C)" written beside the calibrations.
A gallon of Zerex bought last winter says 70/30 for -84F, 60/40 for
-62, and 50/50 for -34.
Is it true that ethylene glycol raises the boiling temp and lowers the
freezing temp, but decreases the rate of heat transfer from iron to
coolant to radiator?
Bob
On Mon, 26 Aug 2002 22:07:53 -0400 "Gordie's Garage"
<mg_garage@ameritech.net> writes:
> Yeh, you're right, and max is down to -84deg F. I'm in a little more
> temperate clime, and -34 F (50/50) would work for me. I use 75/25
> and a
> little water wetter, but my LBC's live inside in the winter.
> Not sure what the old bottles used to say, maybe good to -40 F at a
> 50/50
> mix?
> Anybody got one?
>
>
> Safety Fast!
> Gordie Bird
> 62 MGA
> 80 MGB
>
>
>
> >
> >
> > Last fall I checked my coolant with an old Prestone hydrometer. I
> was
> > puzzled by the poor reading, because I knew I had mixed it for
> maximum
> > freeze, 50/50. Later I happened to notice that the container
> listed the
> > maximum protection at a concentration of 70/30. Well, I'm sure the
> > properties of ethylene glycol and water have not changed over the
> > years. The
> > manufactures of antifreeze are selling us diluted antifreeze! A
> > trip to the
> > store revealed it's not just Prestone, all the brands are
> > diluting. HOW LONG
> > HAS THIS BEEN GOING ON?
> >
> > Bob Donahue (Still stuck in the '50s)
> > Email - bobmgtd@insightbb.com
> > 52 MGTD - NEMGTR #11470
> > 71 MGB - NAMGBR #7-3336
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