On Mar 13, 6:21 am, "Allen" wrote:

You should probably plan on doing this again in about 25 hours. With only
four hours on a top your cylinder pressures are nowhere near even; you
should expect some vibration.

But that causes vibration torsionally, which the accelerometer
ignores. The accelerometer reads vertical movement of the engine,
normally as close as possible behind the prop. Uneven firings will
cause the engine to rotate around the crankshaft, with no vertical
component.

Dan