...........\\\ ///............
|
| Temporary
Shear Stability Index(TSSI) |
The
measure of the viscosity modifier's
contribution to an oil's percentage
viscosity loss under high shear
conditions. Temporary shear
loss results from the reversible
lowering of viscosity in high
shear areas of the engine, an
effect that can positively influence
fuel economy and cold cranking
speed. |
| Temporary
Viscosity Loss (TVL) |
Measure
of decrease in dynamic viscosity
under high shear rates compare
to dynamic viscosity under low
shear. |
| Tribology |
Science
of the interactions between
surfaces moving relative to
each other, including the study
of lubrication friction and
wear. |
...........\\\ ///............
|
| Valve
Lifter |
Sometimes
called a "cam follower",
a component in engine designs
that use a linkage system between
a cam and valve it operates.
The lifter typically translates
the rotational motion of the
cam to a reciprocating linear
motion in the linkage system. |
| Vapor
Pressure - Reid (VPR) |
Measure
of the pressure of vapor accumulated
above a sample of gasoline or
other volatile fuel in a standard
bomb at 100 degree F (37.8 degree
C). used to predict the vapor
locking tendencies of the fuel
in a vehicle's fuel system.
Controlled by law in some areas
to limit air pollution from
hydrocarbon evaporation while
dispensing. |
| Varnish |
A
thin, insoluble, nonwipeable
film occurring on interior clearance
moving parts called lacquer
in diesel engines, engine parts,
can cause sticking and malfunction
of close. |
| Viscosity |
A measure of a fluid's resistance
to flow.
|
| |
|
