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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
----- Original Message ----- From: "Bob White" <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, August 20, 2005 8:33 PM
Subject: [FlyRotary] Re: Oil Cooler Connections [Thermostat]
Hi Ralph,
I think the thermostat in the oil cooler works differenty than the
typical thermostat in an auto cooling system. In the cooling system,
it blocks most of the flow until the water heats up. This wouldn't be
good for the oil, so here the thermostat is open to allow flow to
bypass the oil cooler but still maintain full flow, then closes to
force the oil to flow thru the oil cooler. At least, that's how I
understand it.
Bob W.
On Sat, 20 Aug 2005 19:02:13 -0500
"Ralph Reed" <ralph_reed@sil.org> wrote:
In cars the thermostat when cold is closed and the water circulates in the
block for for quicker warm up. It warms up and starts letting the water out
to the radiator. when the whole block is more than (usually 180 degrees) it
stays open. I think having the thermostat in the wrong place would
complicate things and I am not at all convinced that you need one at all.
KISS. I would want more than a few seconds of run time on the engine before
I headed up into the wild blue yonder.
It is also possible to get the thermostat in upside down (what looks right
is not necessarly right) and crack the exhaust manifold at least on a car.
This is not like sitting in your driveway late for work wanting the car to
warm up quickly to beat the clock, this is your life!
Ralph
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