REFLECTOR:RE: Vernitherm as a Bypass Valve

[Bob Jackson]

Scott,

Can you please explain what a "congealing oil cooler is" and what was done
to make them "non-congealing" in "modern" times?  Do the newer Vernitherms
also function to bypass oil when the pressure is too high, as well as when
the oil temperature is too cold?

We have a Vernitherm in our engine oil cooler, but as far as I know, there
is not one in the forward oil cooler or the "sandwich" that sends the oil to
the forward cooler.  Therefore, you would think that oil congealing in the
forward oil cooler could still obstruct normal engine oil flow, since the
forward oil cooler is a part of a "serial" path coming out of the engine oil
filter via the sandwich.

A related point -- if it's the Vernitherm's additional bypass function that
protects the normal engine cooler against congealing, although it would then
allow oil to bypass the cooler, oil would no longer be cooling in the cooler
and also the oil congealed in the cooler would be "out of service" and the
effective oil circulating in the engine would be reduced by the amount still
congealed in the cooler.

I appreciate your insights -- sorry to bore everyone else to death on this
subject,
Bob



-----Original Message-----

"...No modern(later than 1965?) airplane has a congealing oil cooler on it,
or
maybe I should say, can't imagine any one actually installing one on a new
airplane such as our homebuilts..."