Originally Posted by Capt
Interesting to read this. On that note anyone got thoughts on a non inverted oil system and how long could one expect a neg G influence on the oil before some serious damage might result? Yeah I know how long is a piece of string but occasionally when I roll I might get a small amount of Neg G (accidentally) going inverted but only a few seconds, anyone?
During phase 1 I measured without inverted oil or fuel pick up on an IO360 M1B with fixed pitch prop the following oil pressures inverted:
80psi->50psi = 3 seconds ( min for continues ops at full power )
80psi->25psi =15 seconds ( stopped at 25 psi as that's factory min for Lycoming) )
Below thread shows you this years sportsman without inverted oil or fuel pickup some engine/prop which has small negative portions in it:
So I wouldn't be worried.