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

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.

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

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.

John,

Several of the operations I know here actually ban
leaning below 5000 feet.


Change operations! Run, don't walk!

--
Thomas Borchert (EDDH)

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)

Bsalai,

Any suggestions?


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

--
Thomas Borchert (EDDH)

50 RPM drop on the rich side is too rich at cruise.

I've never heard of leaning to an RPM drop... just to an EGT drop.

With fuel injection, just a little below peak or even at
peak if the cruise power is set below 70%.

Why is fuel injection different? More even mixtures across the cylinders?

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

Yes, engine roughness is caused by one cylinder misfiring.
Fuel injection is properly calibrated is the same on all
cylinders so the engine runs smooth and balanced.


"Jose" wrote in message
om...
| 50 RPM drop on the rich side is too rich at cruise.
|
| I've never heard of leaning to an RPM drop... just to an
EGT drop.
|
| With fuel injection, just a little below peak or even at
| peak if the cruise power is set below 70%.
|
| Why is fuel injection different? More even mixtures
across the cylinders?
|
| Jose
| --
| Money: what you need when you run out of brains.
| for Email, make the obvious change in the address.