Gee, Colin, you pushed me to do a veeery long Internet search to check
that one! ;-)
It seems the SAE scale is completely arbitrary. It was made by defining
brackets ("ratings") on a viscosity table, which itself was defined in the
International Standard viscosity unit, which is in square millimeters per
second, AKA Centistokes.
The SAE being the Society of American Engineers, I would have expected
something from the British Imperial system, but it seems there is no
Imperial viscosity unit. Since the Imperial system is based on ancient
kings' body parts, maybe the kings refused to have the viscosity of their
blood sampled? ;-)
Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France
"Colin & Bev Rainey" <crain...@cfl.rr.com>
Envoyé par : krnet-boun...@mylist.net
2005-04-25 21:14
Veuillez répondre à KRnet
Remis le : 2005-04-25 21:14
Pour : "KRnet" <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : KR> Specs etc...
Serge, you probably saw numbers changed into the metric system, we here
would see them posted on literature in F. The first number before the "W"
is the winter rating, oil's ability to thin, and the second is the summer
rating, and ability to thicken, or withstand high temperature before
breakdown. The manufacturers do not add the "S" because it would be
redundant.
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