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The Lycoming spec for the O-235 and O-320 shows a maximum
pressure drop of 5.5" H2O, 0.35"hg for
cooling at all power levels. Typical drop is more in the 2" to 4" level. Since
there is flow through the cylinders, there has to be higher than static pressure
below the cylinders. I think that the pressure fluctuations shown on the ASI
indicate some sort of turbulation going on; not good. I would think they should
be smooth. Mine were when I monitored my duct
pressures.
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