I appreciate the great response from the LML list to my vibration problem.  I have checked everything that was mentioned in the emails.  Most people including myself suspect a tracking issue. But here is the rub:  On the ground the tracking appears to be perfect with the engine noyt running.  Now this is where it gets interesting, in cruise and level flight at 24"/2400RPM I can see some dither on my ASI and feel the vibration thorugh the airframe.  Now if I point the plane downhill at say 700fpm or more and the same power setting everything smoothes out! 

 

This to me suggests something in the prop tracking or engine mounting arrangement since right turning P factor is less with the nose below the horizon.  Any ideas?

 

Thanks

 

Tom

 

LNC2 50 hrs