Gene Whitt is back on line

"Robert Chambers" wrote in message
om...
seriously? banning leaning below 5000'? I guess they enjoy cleaning lead
fouled plugs then.

You have to remember, though, that many pilots and even mechanics think lead
fouling is caused by leaning TOO MUCH, not too LITTLE.


I can't fathom some blanket rule like that, they should be teaching proper
leaning techniques not banning the use of it.

Standard procedures in many (most?) places says 50 or so ROP...about the
worst place you can run your engine.

Matt Barrow wrote:


Standard procedures in many (most?) places says 50 or so ROP...about the
worst place you can run your engine.


That's where I was taught to lean to. I think the reason was that it is
a safe place, whereas lean of peak has some advantages, but can get you
into trouble with detonation if you are not really careful.

Any suggestions?

Brad

At low cruise settings, lean to get roughness (miss-firing
of the leanest cylinder) and then richen to smooth. You
have to do it very gently, just pressure on the mixture or
you'll over-shoot the settings. That is with a carb. If
you have fuel injection, it will run smooth until it quits,
follow the tables for fuel flow from the manual or use the
EGT.

For take-off above 3,000-5,000 feet density, you should lean
to get the proper mixture and max power.


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"bsalai" wrote in message
...
| Matt Barrow wrote:
|
|
| Standard procedures in many (most?) places says 50 or so
ROP...about the
| worst place you can run your engine.
|
|
| That's where I was taught to lean to. I think the reason
was that it is
| a safe place, whereas lean of peak has some advantages,
but can get you
| into trouble with detonation if you are not really
careful.
|
| Any suggestions?
|
| Brad

Bsalai,

Any suggestions?


Uhm, get educated! For starters, read John Deakin's columns on engine
management at www.avweb.com

--
Thomas Borchert (EDDH)

"bsalai" wrote in message
...
Matt Barrow wrote:


Standard procedures in many (most?) places says 50 or so ROP...about the
worst place you can run your engine.


That's where I was taught to lean to. I think the reason was that it is a
safe place,

Hardest on the engine is not waht I call safe.

whereas lean of peak has some advantages, but can get you into trouble
with detonation if you are not really careful.

No, you can't really...only if you lag going from ROP to LOP.


Any suggestions?


Here's a start.

http://www.avweb.com/news/columns/182132-1.html
May 27, 2001
Detonation Myths

We've all been taught about detonation in piston aircraft engines. It's what
occurs when combustion pressure and temperature get so high that the
fuel/air mixture to explodes violently instead of burning smoothly, and it
can destroy an engine in a matter of seconds. Right? Well, not exactly.

"bsalai" wrote in message
...
Matt Barrow wrote:


Standard procedures in many (most?) places says 50 or so ROP...about the
worst place you can run your engine.


That's where I was taught to lean to. I think the reason was that it is a
safe place, whereas lean of peak has some advantages, but can get you into
trouble with detonation if you are not really careful.

Any suggestions?

http://www.avweb.com/news/columns/182146-1.html (Series on the right side of
the page), also:

http://www.engineteststand.com/

Standard procedures in many (most?) places says 50 or so ROP...about the
worst place you can run your engine.

If it really =is= the worst place, how did the engine makers come to
reccomend it?

Jose
--
Money: what you need when you run out of brains.
for Email, make the obvious change in the address.

50 RPM drop on the rich side is too rich at cruise... 50
degrees rich of peak on the EGT is about right with a carb.
With fuel injection, just a little below peak or even at
peak if the cruise power is set below 70%. At low power
settings you can run at peak since the actual temperatures
will be low. If you have a calibrated EGT (TIT) follow the
limits.


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"Jose" wrote in message
. net...
| Standard procedures in many (most?) places says 50 or so
ROP...about the
| worst place you can run your engine.
|
| If it really =is= the worst place, how did the engine
makers come to
| reccomend it?
|
| Jose
| --
| Money: what you need when you run out of brains.
| for Email, make the obvious change in the address.

Jim,

50 RPM drop on the rich side is too rich at cruise... 50
degrees rich of peak on the EGT is about right with a carb.
With fuel injection, just a little below peak or even at
peak if the cruise power is set below 70%. At low power
settings you can run at peak since the actual temperatures
will be low. If you have a calibrated EGT (TIT) follow the
limits.


Ok, kids, now lets count all the misunderstandings and factually wrong
statements in that post. Hint: There are at least 5.

--
Thomas Borchert (EDDH)

You tell us.

If I'm wrong I'd like to know.


"Thomas Borchert" wrote in
message ...
| Jim,
|
| 50 RPM drop on the rich side is too rich at cruise... 50
| degrees rich of peak on the EGT is about right with a
carb.
| With fuel injection, just a little below peak or even at
| peak if the cruise power is set below 70%. At low power
| settings you can run at peak since the actual
temperatures
| will be low. If you have a calibrated EGT (TIT) follow
the
| limits.
|
|
| Ok, kids, now lets count all the misunderstandings and
factually wrong
| statements in that post. Hint: There are at least 5.
|
| --
| Thomas Borchert (EDDH)
|