REFLECTOR:RE: Vernitherm as a Bypass Valve

[Scott]

Congeal is a slippery word.  :-)

It means it stops flowing.  So it depends on the size of the hole its 
trying to flow through.
I've seen 100 weight at -10, it flowed like corn syrup.

With multi grades like 10-50, etc.. it has to get mighty cold to not flow 
through a 1/2 inch line.  Maybe in the Artic or Antartica?

Do we have any Alaskans or Canadians or this list who live in the far 
north?  How say you hosers?

Scott

At 03:42 PM 12/4/2003, you wrote:
>How cold does modern oil have to get to "congeal"?  I've never seen it
>but I live, love and fly in Louisiana.
>Rene'
>
>-----Original Message-----
>From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org] On
>Behalf Of Scott
>Sent: Tuesday, December 02, 2003 9:32 PM
>To: reflector@tvbf.org
>Subject: Re: REFLECTOR:RE: Vernitherm as a Bypass Valve
>
>Bob,
>
>As I understand it, I've never cut one apart, a non-congealing oil
>cooler
>has a large orifice running through some portion of the cooler that
>allows
>the cold congealed oil to flow through it.  The veritherm/bypass valve
>that's on your accessary case allows a very small amount of oil to flow
>all
>the time(when its closed its not totally closed) .  This small amount of
>
>oil flows all the time, as it warms up it slowly warms up the cooler.
>If
>the cooler is really really cold then when the veritherm valve opens the
>
>oil will only flow though the "wee-wee" hole in the cooler at first,
>slowly
>warming up the smaller cooling orifices right next to the flow and
>spreading out from there.
>
>Thats how I understand it.
>
>Some oil coolers have there own veritherm valve built in so you can run
>multiple coolers but only the ones that see hot oil will open up and
>cool
>the oil.  Is that what your talking about?   I've only seen these on
>automotive coolers.
>
>The veritherm valve that is also a bypass valve that I am talking about
>is
>built into a housing that bolts to the accessary case and that's where
>you
>hook up your external filter/cooler lines.
>
>Scott
>
>At 06:30 PM 12/1/2003, you wrote:
> >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..."
> >
> >
> >
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