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Attn: Hydraulic experts - oil pressure relief fix?
Okay, here's the deal. Lycoming O-320 in a Glasair. On full power, whether
oil is hot or cold, oil pressure will be higher than the regulator is set for. (Shoots to top of yellow arc - 90 psi. I think most Lyc's do that.) Upon power reduction, say turning downwind, you can "see" the ball pop off the seat when the oil pressure gage goes "sproinggg" and the pressure suddenly drops to the regulated 60 psi in a classic 2nd order damped sinusoidal response. It will stay at regulated pressure until the ball seats itself again, say on final approach with the engine back to idle, and the pump isn't making as much pressure. Then the process starts over again, on the next touch 'n' go. I'd like to have regulated oil pressure all the time. I'm theorizing that there's some kind of venturi effect, where the ball is actually sucked down harder on the seat when lots of oil is flowing past it on the engine side. Seems counter-intuitive, I know, but what else could be holding the ball down? Is oil cohesive? Anyone got a simple fix I can try? Larger ball bearing? Smaller ball bearing? Cutting groves in the seat to help ball break free? Different angle on the face of the seat? Thanks, Mike Palmer Excellence in Ergonomics |
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