Engine mixture guidelines

C J Campbell wrote:


New what? Manufacturers? Engines? Planes? I don't know of any Cessnas, Pipers
or Beeches that provide settings for it. Or Lycomings or Continentals.



The Continental IO-550, which is by far the most popular engine now a
days, comes with LOP in the power settings. These come directly from
Continental.

I have never, ever heard of LOP discussions talk about peak RPM. Why
would that ever even enter the conversation?


Some trainers, I can not recall whether it was the Cessna 150M or the 152
and can not immediately find the POH, authorized slightly lean of peak RPM
operation at 60 percent power or less. Both aircraft have fixed pitch
props, and only a tachometer--no EGT or analyzer.

Interestingly, the statement was in an area pertaining to training
operations (Chapter 6 or 7 IIRC) rather than in the pace where it would have
been expected. I seem to recall 25 RPM lean of peak, although it could have
been slightly more, and I certainly would not go out and try it without
further reference to the manual. In fact, even though a number of
contributors have pointed out that engines are quite tolerant when operating
at low power, it has been many years and it would be a good idea to verfiy
that the POH is still current.

BTW, when the lean operation was used where applicable, the aircraft became
VERY economical to operate--and the plugs probably lasted much longer as
well.

Peter

On Sun, 7 Jan 2007 17:07:07 -0800, Newps wrote
(in article ):



C J Campbell wrote:


New what? Manufacturers? Engines? Planes? I don't know of any Cessnas,
Pipers
or Beeches that provide settings for it. Or Lycomings or Continentals.



The Continental IO-550, which is by far the most popular engine now a
days, comes with LOP in the power settings. These come directly from
Continental.



Ah. Thanks. I also did not know that the Continental IO-550 was so popular.
What planes use it?

All the Beech Baron and Bonanza models.


"C J Campbell" wrote in
message
e.com...
| On Sun, 7 Jan 2007 17:07:07 -0800, Newps wrote
| (in article
):
|
|
|
| C J Campbell wrote:
|
|
| New what? Manufacturers? Engines? Planes? I don't know
of any Cessnas,
| Pipers
| or Beeches that provide settings for it. Or Lycomings
or Continentals.
|
|
|
| The Continental IO-550, which is by far the most popular
engine now a
| days, comes with LOP in the power settings. These come
directly from
| Continental.
|
|
|
| Ah. Thanks. I also did not know that the Continental
IO-550 was so popular.
| What planes use it?
|

Peter,

is the failure of contributors to state
whether they are talking about peak rpm or peak egt,


I've never seen anyone talking about peak rpm in connection with
ROP/LOP.

--
Thomas Borchert (EDDH)

C,

What
does Cirrus say?


Cirrus provides settings, as does Diamond (and Piper). They use TCM and
Lyc.

--
Thomas Borchert (EDDH)

C,

I also did not know that the Continental IO-550 was so popular.
What planes use it?


The Cirrus SR22 is probably the most popular application these days.
The Bo, the Columia (?) and Piper uses them, Mooney too, if I am not
mistaken.

--
Thomas Borchert (EDDH)

On Sun, 7 Jan 2007 23:52:18 -0800, Thomas Borchert wrote
(in article ):

Peter,

is the failure of contributors to state
whether they are talking about peak rpm or peak egt,


I've never seen anyone talking about peak rpm in connection with
ROP/LOP.



I have. Some planes don't have EGT or other decent temp gauges. I used to fly
one like that quite regularly, 172RG IIRC. (My own 172RG had an EGT gauge.)

C,

I have. Some planes don't have EGT or other decent temp gauges. I used to fly
one like that quite regularly, 172RG IIRC. (My own 172RG had an EGT gauge.)


Well, let me rephrase then: I have never seen anyone really recommending LOP
operation without an engine monitor.

--
Thomas Borchert (EDDH)

On Mon, 8 Jan 2007 08:53:08 -0800, Thomas Borchert wrote
(in article ):

C,

I have. Some planes don't have EGT or other decent temp gauges. I used to
fly
one like that quite regularly, 172RG IIRC. (My own 172RG had an EGT gauge.)


Well, let me rephrase then: I have never seen anyone really recommending LOP
operation without an engine monitor.



:-)