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From: "Ralph Reed" <ralph_reed@sil.org>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-676317@logan.com>
Subject:  [FlyRotary] Oil Cooler Connections [Thermostat]
Date: Sun, 21 Aug 2005 01:01:57 -0500
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I still do not see the difference. The water circulates freely in the block 
without restriction until the thermostat opens and allows water to run 
through the radiator. It does open and close a few cycles for a few seconds 
as it passes through a particular temperature range. Opens, cools off, 
closes etc. Additionally you have the steam issue so we have to add a 
pressure release to an overflow that is not an issue with the oil.

The oil is at full pressure running through the appropriate places in the 
block and when a certain temperature is reached the oil starts making an 
extra lap around the cooler. Once it starts through the cooler it runs 
through the cooler until shut down, right?

Okay, everybody outside the box for a second. (That is all it will take an 
engineer to explain why this would weigh too much!)

The water and the water pump weigh something and the radiator weighs 
something, all its plumbing weighs something, and the overflow tank and its 
plumbing weigh something.   What if the engine were designed to be cooled by 
oil alone?  I know water transfers faster so how much more oil would you 
have to have to cool it?  There has to be an engineer that knows all  about 
heat transfer rates that could figure this out. How much does this have to 
do with the specific oil?  Light enough to transfer well, thick enough to 
lubricate.


Blessings, Ralph


----- Original Message ----- 
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, August 20, 2005 8:00 PM
Subject: [FlyRotary] Re: Oil Cooler Connections [Thermostat]


> You are correct, Bob.  You never want your oil flow to be impeded! Which 
> would   happen if the oil thermostat worked as the coolant thermostat 
> does. When the oil thermostat is cold, it's by-pass hole is fully open 
> allow most (but not all) of the oil to by pass the cooler. This permits 
> the oil to reach operating temperature quickly as most of it is not being 
> cooled by flowing through the channels of the cooler.   Once it reaches 
> its operating temperature the thermostat expands (a plunger extends) plugs 
> the hole and forces all the oil through the oil cooler.   As someone 
> mentioned it is very easy to stick the thermostat in backwards.  Not 
> realizing how strong the spring was when I unscrewed the one in my cooler 
> the entire assembly blew past the nut (and my hand) and hit the floor 
> disassembled and with me no diagram to show which end was which.
>
> Ed A
>