| Tom,
based on this and previous descriptions it sounds like the vibration occurs with higher power or higher torque. On my airplane I had a problem with the left intake manifold rubbing on the cowl at certain power settings. I wonder if you are getting some interference between something on the engine and some part of the cowl in the presence of torque.
Colyn On May 23, 2011, at 8:03 AM, TOM GARDINER wrote:
Folks, 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
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