I have played with leaning, did it as gami suggested, by running LOP I am down to
about 8-9 GPH which seems really low. I have an insight engine monitor which I use
when leaning. Leaning that much makes me nervous, I always feel like I will kill
the engine. the 12 gph is probably right about 50 degrees ROP, 13 will make it
about 100 degree's ROP.
I am flying sunday morning to cedar city UT to practice some instrument approaches
with my new garmin 430 so will take the time to really mess with the leaning.

But I thought that by going lean, then increasing MP to get back lost power would
put more stress on the engine thus making it run at a higher output.
I have a turbo, so I only fly at 65% power to keep the temps down since I dont have
an intercooler. All the other t-arrow owners I know said by flying at 75% power
they have cracked alot of cylinders. so the way I have been doing it was after
getting to cruise altitude, I would lean to about 12 gph which is consistant with
65% power.
But hell, I may have been doing it all wrong knowing me

BTW I think your mooney or the 201 has the same engine I have, I have to look and
see for sure. Its the TSIO-360-FB, 6 cylinder, fuel injected and rated at 215 HP in
some airplanes.

Jeff
http://www.turboarrow3.com


Ron Rosenfeld wrote:

On Sat, 22 Nov 2003 16:10:07 -0800, Jeff wrote:

The gamiJectors say you can run lean of peak, but when I tried it, I seemed to
lose some airspeed, so I lean to 12 gph which is just a tiny bit ROP, thats
seems to be the best mixture setting for me.

Jeff,

I don't have GAMIJECTORS but have read quite a bit about them. So let me
say the following but, by all means, check with Braley or someone you
respect as knowledgeable.

By running LOP you are running more efficiently -- by that I mean you
produce more HP per unit of fuel consumed. However, as you have noted,
leaning the mixture that far will reduce the total power produced, and you
will certainly see a drop in airspeed.

If by "running a tiny bit ROP" you mean in the range of 25-50° ROP EGT,
that is a baaad place to run an engine. CHT's are higher, and cylinder
pressures are also higher than at other settings. IF you are going to run
ROP, you should try to run around 100-125° ROP.

An alternate method of maintaining the increased BSFC, lower temperatures,
and lower cylinder pressures you obtain by running LOP EGT, if possible
with your setup, would be to, for example, set your power to 65%; lean to
25-50° LOP EGT; and then, instead of using the mixture control to get your
12 gph, use your throttle! That regains the power you lost while
maintaining the benefits of running LOP! You might find you need less than
12 gph to regain your lost airspeed. (GAMI should have a multiplier for
the fuel flow in your engine which you can use to determine HP from fuel
flow).

Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)