Lyc oil temps

Is it true that 180F is optimal?

Yes, 180 at the temp probe. There are other parts of the engine where
the oil runs hotter, and should be, to boil out moisture.


On Sun, 30 Nov 2003 16:41:40 -0600, "brucrx"
wrote:

Is it true that 180F is optimal?

On Sun, 30 Nov 2003 16:41:40 -0600, "brucrx"
wrote in Message-Id: :

Is it true that 180F is optimal?

http://www.prime-mover.org/Aviation/...si1094d-3.html
For maximum service live, maintain the following recommended limits
for continuous cruise operation:

(a) Engine Power Setting - 65% of rated or less.

(b) Cylinder head temperatures - 400*F. or below.

(c) Oil temperature - 165*F. - 220*F.

"brucrx" wrote in message ...
Is it true that 180F is optimal?

180F is the minimum to boil off any water. The maximum is typically 212F.
Check your operating limitations.

Ron Natalie wrote:

"brucrx" wrote in message ...
Is it true that 180F is optimal?

180F is the minimum to boil off any water. The maximum is typically 212F.
Check your operating limitations.

212F max at Sea Level. The boiling temperature of water decreases with decreasing pressure.

"CC Wright" wrote in message ...


Ron Natalie wrote:

"brucrx" wrote in message ...
Is it true that 180F is optimal?

180F is the minimum to boil off any water. The maximum is typically 212F.
Check your operating limitations.

212F max at Sea Level. The boiling temperature of water decreases with decreasing pressure.

No, the operating limitations say 212 (well in my case 100 C). It does not say it is the boiling
point of water nor does it say anything about the limit varying with altitude.
..

Ron Natalie wrote:

"CC Wright" wrote in message ...


Ron Natalie wrote:

"brucrx" wrote in message ...
Is it true that 180F is optimal?

180F is the minimum to boil off any water. The maximum is typically 212F.
Check your operating limitations.

212F max at Sea Level. The boiling temperature of water decreases with decreasing pressure.

No, the operating limitations say 212 (well in my case 100 C). It does not say it is the boiling
point of water nor does it say anything about the limit varying with altitude.

The maximum you wrote above appears to be in the context of boiling off any water, since it is after a
sentence that discusses the minimum (temp) to boil off any water. The laws of physics describe
boiling points, operating limitations do not need to, since these exist in nature. It is physically
impossible to boil water above 212F at Sea Level Pressure, since if the temp is higher than that it
has already boiled. That maximum temperature of water in the liquid state decreases as pressure
decreases, i.e. increased pressure altitude.

"CC Wright" wrote in message ...

The maximum you wrote above appears to be in the context of boiling off any water, since it is after a
sentence that discusses the minimum (temp) to boil off any water. The laws of physics describe
boiling points, operating limitations do not need to, since these exist in nature. It is physically
impossible to boil water above 212F at Sea Level Pressure, since if the temp is higher than that it
has already boiled. That maximum temperature of water in the liquid state decreases as pressure
decreases, i.e. increased pressure altitude.

Sorry if I was not clear. 180F is the temperature that the oil temp guage must indicate to start
boiling off water. 212 (or as some have pointed out 220 for other installations) is the limit set
by the manufacturer to keep the oil from getting too hot (nothing to do with boiling water).

While liquid water won't ever get above the boiling point, remember that this guage isn't stuck in
water, it's stuck in oil. If you put water in 350 degree oil it will burn off. Anybody who has deep
fried something is quite familiar with this effect.

"Ron Natalie" wrote in message m...
"brucrx" wrote in message ...
Is it true that 180F is optimal?

180F is the minimum to boil off any water. The maximum is typically 212F.
Check your operating limitations.

212F sounds a bit low. While that is the boiling point of water,
most of the Lycs I've flown behind have a max oil temp of around 240F.
Oil begins to break down at around 260F.

John Galban=====N4BQ (PA28-180)

John Galban wrote:

212F sounds a bit low. While that is the boiling point of water,
most of the Lycs I've flown behind have a max oil temp of around 240F.

The O-320 series limit varies, depending on the OAT. The max is 245 degrees at
average temperatures above 30 degrees but is as low as 210 degrees with average
OAT below 10 degrees.

George Patterson
Some people think they hear a call to the priesthood when what they really
hear is a tiny voice whispering "It's indoor work with no heavy lifting".