shempdowling2(at)earthlin
Guest
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 Posted: Fri Feb 10, 2006 7:16 am Post subject: Vernatherm mystery unveiled |
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Alright, someone explained how this works and why. He replied off list so
I'll remove his identity.
Here goes:
There is always oil pressure in both the return line from the cooler and
inlet to the cooler line weather the oil is cold or hot. There is only
full flow through the cooler when the oil is hot. When the oil is cold the
oil is ported is such a way that there is the same oil pressure going down
the return line as what is going down the in line to the cooler. Thus no
flow. When the vernatherm expands it changes the routing so that all the
oil goes through the cooler and then back to the engine instead of down
both lines. When the oil is cold there is actually a very small flow
through the cooler even though the vernatherm is open. This is done by
design, they do that so that when it is very cold the oil won't congeal in
the cooler because if there was no flow, the stagnant oil would "freeze" in
the cooler effectively blocking the cooler and preventing its use once the
vernatherm called for cooling. This is why when it is cold out and we can't
get any real oil temp, blocking the airflow over the cooler will help run
the oil a bit warmer then without the block installed because we blocked
the cooling air attacking the non congealing flow through the cooler.
Not trying to start an argument just trying to set you straight.
No argument here. Thanks for the reply.
Shemp/Jeff Dowling
RV-6A, N915JD
265 hours
Chicago/Louisville
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