Paul Eastham
Well Known Member
Anyone care to take crack at the following mystery? Thanks for even idle speculation, since I'm stumped!
O-320-D2A with 500 hours, running with Dynon EMS-D10 the whole time. The Dynon has been set with a redline of 100psi oil pressure the whole time, which was never hit until recently, despite it being summer. First on the takeoff roll, and now even during the runup, just barely touching 100 psi. Cruise pressure sometimes seen >90 psi (manual says redline is 90 except during start and warm up, then 100)
What I've tried:
- Replaced old-style pressure sender, no change
- Checked pressure with steam gauge, matches Dynon within 2-3 psi
- Adjusted pressure relief valve to all the way out, did drop cruise pressures a bit to just below 90
- Oil change, no visible metal found (waiting for oil analysis), psi still high after oil change
- Inspected relief valve and probed the drain passage, no trouble found
With hot oil (running W100 for past two years), the pressures I guess are still (barely?) within limits, but something seems to have changed. What else should I look at?
O-320-D2A with 500 hours, running with Dynon EMS-D10 the whole time. The Dynon has been set with a redline of 100psi oil pressure the whole time, which was never hit until recently, despite it being summer. First on the takeoff roll, and now even during the runup, just barely touching 100 psi. Cruise pressure sometimes seen >90 psi (manual says redline is 90 except during start and warm up, then 100)
What I've tried:
- Replaced old-style pressure sender, no change
- Checked pressure with steam gauge, matches Dynon within 2-3 psi
- Adjusted pressure relief valve to all the way out, did drop cruise pressures a bit to just below 90
- Oil change, no visible metal found (waiting for oil analysis), psi still high after oil change
- Inspected relief valve and probed the drain passage, no trouble found
With hot oil (running W100 for past two years), the pressures I guess are still (barely?) within limits, but something seems to have changed. What else should I look at?