Shock *Heating*?

In another thread (about cold starting) it was mentioned that Alaskan bush
pilots routinely drain their oil, take it inside, and heat it on the stove
before starting in the morning.

While this guarantees a warm(er) engine, wouldn't this risk damage to the
engine from shock heating (assuming there is such a thing), by suddenly
introducing boiling hot (or nearly so) oil to a cold-soaked engine?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

Jay Honeck wrote:
In another thread (about cold starting) it was mentioned that Alaskan bush
pilots routinely drain their oil, take it inside, and heat it on the stove
before starting in the morning.
While this guarantees a warm(er) engine, wouldn't this risk damage to the
engine from shock heating (assuming there is such a thing), by suddenly
introducing boiling hot (or nearly so) oil to a cold-soaked engine?

Your engine operates at what temperature?
Think about the operating temperature of the oil. I doubt someone
knowledgeable would heat their oil up to the full operating temperature
and risk breaking down the oil. There is sufficient mass in the engine
to absorb the "warm" oil without damaging the case. I suspect that the
temperature of the oil by the time it has all been added will have
dropped many degrees.

john smith wrote:

I suspect that the
temperature of the oil by the time it has all been added will have
dropped many degrees.

It will have dropped many degrees just carrying the can out to the plane.

George Patterson
A diplomat is a person who can tell you to go to hell in such a way that
you look forward to the trip.

In article QdQZb.376650$na.567800@attbi_s04,
Jay Honeck wrote:
While this guarantees a warm(er) engine, wouldn't this risk damage to the
engine from shock heating

Look at a graph from one of those data-capturing engine monitors some
time. The steepest lines on the graph will always be at takeoff. Even
pulling power and diving can't cool the engine as fast as the takeoff
roll can heat it up.

--
Ben Jackson

http://www.ben.com/

Look at a graph from one of those data-capturing engine monitors some
time. The steepest lines on the graph will always be at takeoff. Even
pulling power and diving can't cool the engine as fast as the takeoff
roll can heat it up.

So would this be proof that damage from "shock cooling" is a myth?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

Jay,

So would this be proof that damage from "shock cooling" is a myth?


At least it would be some support for that opinion.

--
Thomas Borchert (EDDH)

"Thomas Borchert" wrote in message
...
Jay,

So would this be proof that damage from "shock cooling" is a myth?


At least it would be some support for that opinion.


FWIW, "Light plane maintenance" doesn't believe in shock cooling
either, but they do recommend babying the engine for other
reasons (unspecified). Risk of detuning engine?

It is up to those that assert there is such a thing as damage from shock
cooling and shock heating to prove it. So far all anyone has ever offered is
a small amount of anecdotal evidence: "I knew a pilot once who did this and,
sure enough, his engine quit, although it was for some other reason."

C J Campbell wrote:

It is up to those that assert there is such a thing as damage from shock
cooling and shock heating to prove it.

With the cost of engines the way it is, I suggest that the situation is exactly
the other way 'round. Until you can prove conclusively that shock cooling does
not exist, baby the engine.

George Patterson
A diplomat is a person who can tell you to go to hell in such a way that
you look forward to the trip.

With the cost of engines the way it is, I suggest that the situation is
exactly
the other way 'round. Until you can prove conclusively that shock cooling
does
not exist, baby the engine.

That's good advice -- with any engine.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"