All,      testing the motor to find that it is running smoothest at
 an A/F ration of almost 13 at 2200 rpm. This is on a PLX meter and
 appears a little lean.  What say the experts??    Neil.

 That's about right for p-port idle. What is the manifold pressure. I
 assume engine RPM. All engines like to run a bit rich at idle.

 The p-port is no great shakes at idle. What is it for WOT with the
 airplane well tied down? Mixture, manifold  pressure, EGT, and RPM?
 That is the real proof of the pudding.

 Paul Lamar

 For a car at idle of 800-900 RPM that is about right. Slightly rich warmed
up. Then as the revs come up they should lean a bit. Light throttle cruise may
let it go lean to 15-16:1. Note: that is light throttle in a car!. For the AC
engine at idle (2000 or so RPM)I would think that is OK. Now with the prop
spinning it is not going to be light load as in a car so will not go lean the
same until you lean it. Us the info Paul asked for above to determine where it
should be. Idle is not a big concern as long as it is fairly smooth. During
takeoff, I would expect 11.5-12:1 for power. Then when you get to economy
cruise you can lean like the car engine or even more as long as it stays
running smooth.

Dale Davies

Dale, the prop gear ratio is 2.85:1

The prop RPM is only 770.

Paul Lamar
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