Nasa Icing courses

Running the engine too slow at startup. Apparently, the cams in some
engines get lubrication mainly from the oil splashing around inside the
case. In some engines, 1000 RPM may not be sufficient for full
lubrication after startup. My A&P suggested 1100 - 1200 RPM.

Isn't that a stitch? Your A&P says 1000 RPM is too *slow* for proper
lubrication. Jim Macklin (and many others) says it may be too *fast* to
run your engine before proper lubrication has occurred. Who is right?

And my A&P says 1000 RPM or slower, primarily to save your prop on loose
rocks but also to ensure long engine life.

Argh. Wouldn't you think there would be SOME science to this?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

Jay Honeck wrote:

Argh. Wouldn't you think there would be SOME science to this?

If there is, it's available from Lycoming or Continental for your engine. Not
from "my A&P says...."

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.

Argh. Wouldn't you think there would be SOME science to this?

If there is, it's available from Lycoming or Continental for your engine.
Not from "my A&P says...."

Well, I am blessed to have an A&P who:

1. Doesn't work on little planes cuz he needs the money.
2. Is an award-winning home builder
3. Has 40 years in the business
4. Is an accomplished pilot
5. Has rebuilt over 100 O-540s, including mine.

What he says about engines is, in my world, gospel.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

"Jay Honeck" wrote in message
news:Hxkwf.474673$084.253721@attbi_s22...

Isn't that a stitch? Your A&P says 1000 RPM is too *slow* for proper
lubrication. Jim Macklin (and many others) says it may be too *fast* to
run your engine before proper lubrication has occurred. Who is right?


Your O-540 is probably better at oil distribution than my O-235. Your
engine is substantially larger and more expensive. They can afford to give
it a better oiling system than exists in a smaller, cheaper engine.

As for trusting Lycoming to tell us: I believe they have a commitment to
safety, but they also make money from parts, like cam shafts. Adding to
that, summer is much different than winter oil at startup, not to mention
cylinder clearances. On startup, do you want the cylinders to wear out
faster, or would you rather protect your cam? You may not be able to have
both in an optimum fashion on some engines. Less RPM may help the
cylinders, but leave the cam with less lubrication. It makes me wish that
all cams had a direct spray oil system, and that there was an electric oil
pump that could be used to lubricate the engine prior to startup.

Paul Missman

It makes me wish that
all cams had a direct spray oil system, and that there was an electric oil pump that could be used to lubricate the
engine prior to startup.

Paul Missman

You can add a pre-oiler, (at least to some aircraft).

http://www.aircraftspruce.com/catalo...s/proluber.php

I've read of engine modifications for spray nozzles as well but don't have time to find a link right now.




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I think you're thinking of "Ney Nozzles."

http://www.chuckneyent.com/neynozzle.html
Karl
"Curator" N185KG

Jay Honeck wrote:
Running the engine too slow at startup. Apparently, the cams in some
engines get lubrication mainly from the oil splashing around inside the
case. In some engines, 1000 RPM may not be sufficient for full
lubrication after startup. My A&P suggested 1100 - 1200 RPM.


Isn't that a stitch? Your A&P says 1000 RPM is too *slow* for proper
lubrication. Jim Macklin (and many others) says it may be too *fast* to
run your engine before proper lubrication has occurred. Who is right?

And my A&P says 1000 RPM or slower, primarily to save your prop on loose
rocks but also to ensure long engine life.

Argh. Wouldn't you think there would be SOME science to this?

You'd think so, and maybe there is, but if so it hasn't penetrated the pilot
community. Most of what you read is superstition, collective wisdom, common
sense, anecdotal reports, opinion, experiments run with small sample sizes.
Seems the best you can do is to read all the recommendations and try to do the
things that make sense to you. It's frustrating.

Dave