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It's H-shaped, independent and purely mechanical in operation. See below:
|---|
2 to engine <-- | | <-- from secondary 4
|/ \|
1 from filter --> | P | --> to secondary 3
-----
The letter 'P' is the plunger, shaped somewhat like an inverted dish or like
a
drum cymbal, attached to a heat sensitive spring. Oil flows from the filter
(1)
to the plunger (P). When the oil is cold some oil will flow to the
secondary
oil cooler (3, then some back to the engine (4 to 2)) but since that
direction
is a little more restrictive due to all the cold oil in the path most of the
oil
from the filter will travel up past the plunger and flow back to the engine
(2).
As the oil gets hotter the spring in the thermostat will expand and push
the
plunger (P) up into the 'V' shaped opening above (/ \) and plug the pathway.
Now the oil has no choice but to go to the secondary oil cooler (3) then
flow
back to the engine (4 then 2).
Some oil does flow through the secondary at all times. The reasoning behind
this is to keep surges and foaming minimized.
Toby Erkson
air_cooled_nut@pobox.com <-- Please use this address for email
'72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed
'75 Porsche 914 1.8L, ORPCA member
Portland, Oregon, http://www.geocities.com/MotorCity/8501/
>-----Original Message-----
>What I don't understand is exactly what the thermostat does.
>Does it cut
>you off from moving if the oil's too hot, or what? Is there some guage?
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