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

 Yup,
I am on that page. Seems I can't spell "use" though! Just comparing automotive
type running to AC, and it's different requirements.

Dale Davies


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