Shock *Heating*?

"G.R. Patterson III" wrote in message
...


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.

I plead guilty. Even though I do not believe in shock cooling, I admit that
I fly as if I did believe in it.

I have my limits as to how far I will go to accommodate myth and
superstition, though. I refuse to turn my cell phone off at the gas pump
even when Fred Meyer has a big sign ordering me to do it.

I shock heated my engines again on Sunday... This is ~ 5,800 times on the
left engine and 6,400 times on the right engine that the metal has been
taken from ambient temperature (a balmy 28f degrees sunday) to some
1200-1300 degrees F internally in ~10 milliseconds... I watched with
incredulous eyes as neither engine had a jug fly off, nor seized up, nor
started a death rattle, nor immediately dropped compressions into the
40's...

Then upon landing I reduced the throttle and watched as the EGT took some
5,000 milliseconds to to begin to decrease and the CHT's barely dropped
until I was half way back to the hangar on the taxiway... I obviously shock
cooled it into oblivion...

denny - straight from hades...

"Jay Honeck" wrote Until you can prove
conclusively that shock cooling
does
not exist, baby the engine.

That's good advice -- with any engine.
--

denny - straight from hades...

Thanks, Denny -- I couldn't have said it better myself.

I personally don't believe in either shock cooling *or* shock heating -- but
an awful lot of mechanics do.

So, I treat my engine like it's made out of glass.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

I disagree, as long as you allow yourself to think that droughts are a
product of sin or witches, then you will never learn about things like el
nino and its weather affects. Believing things without any evidence gave us
the dark ages.

Mike
MU-2


"G.R. Patterson III" wrote in message
...


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.

"Mike Rapoport" wrote in message
ink.net...
I disagree, as long as you allow yourself to think that droughts are a
product of sin or witches, then you will never learn about things like el
nino and its weather affects. Believing things without any evidence gave
us
the dark ages.


"I worry that, especially as the Millennium edges nearer, pseudo-science and
superstition will seem year by year more tempting, the siren song of
unreason more sonorous and attractive. Where have we heard it before?
Whenever our ethnic or national prejudices are aroused, in times of
scarcity, during challenges to national self-esteem or nerve, when we
agonize about our diminished cosmic place and purpose, or when fanaticism is
building up around us -- then, habits of thought familiar from ages past
reach for the controls.

"The candle flame gutters. Its little pool of light trembles. Darkness
gathers. The demons begin to stir." -- Carl Sagan "The Demon Haunted World,"
1995.

I read this prophetic passage in the light of 9/11, the xenophobic reaction
of the political right, the resulting attempt to grab power at all costs on
the part of the political left, the rise of New Age mysticism and violent
religious fundamentalism, the polarization of the country over abortion, the
environment, nuclear power, etc.; the incredible acceptance of junk science
in the court room, people fearful of little airplanes dropping nuclear
weapons on them....

Well, I have to wonder how long it will be before we sink into the long
night of another dark age.

"Jay Honeck" wrote in message news:QdQZb.376650$na.567800@attbi_s04...
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?

Oh great! A new Old Wive's Tale grin When this gets around the
only safe thing to do with your engine is to run it at idle. And
you'll need to do that once a week to prevent rusting too.

Of course, this dovetails into the TFR stuff too. With all the
security TFRs, and the TFR-in-chief starting his campaign shortly, and
the wannabe TFR-in-chiefs all doing their campaigns... Well, the only
thing we'll be able to do is idle the engines and taxi around the
airport anyway.

Malcolm Teas
JYO

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?

In article eTn_b.385903$na.592869@attbi_s04,
Jay Honeck wrote:

So, I treat my engine like it's made out of glass.

Oh great, now there will be a big flamewar over whether after 100 years
of sitting your glass engine would be thicker on the bottom...

--
Ben Jackson

http://www.ben.com/

Mike Rapoport wrote:

I disagree, as long as you allow yourself to think that droughts are a
product of sin or witches, then you will never learn about things like el
nino and its weather affects.

Well, when I get that farm in NC a few years from now, I'm gonna paint a hex sign
on the barn. Can't hurt.

As they said in Brigadoon, we still have witches; we just pronounce it differently
these days.

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.