Last time I had problem of low oil pressure on hot oil (around 2bar) so I installed rotax washer/shimm under regulator spring.
With washer I had up to 7 on cold and then around 5 bar on hot (high, low rpm simillar).
Today I did short flight, on runup I had around 7 for a moment and pressure decreased down to 5 during flight (hot oil). But when I retarder RPM to ~2000rpm oil pressure drops now down to 2bar!!, increase when I'm increasing RPM.
What it can be? I confirmed last week pressure reading with mechanical gauge, today this behaviour started just by itself. Movie.
912UL
https://www.youtube.com/watch?v=haOO85N6LYY&feature=youtu.be
With washer I had up to 7 on cold and then around 5 bar on hot (high, low rpm simillar).
Today I did short flight, on runup I had around 7 for a moment and pressure decreased down to 5 during flight (hot oil). But when I retarder RPM to ~2000rpm oil pressure drops now down to 2bar!!, increase when I'm increasing RPM.
What it can be? I confirmed last week pressure reading with mechanical gauge, today this behaviour started just by itself. Movie.
912UL
https://www.youtube.com/watch?v=haOO85N6LYY&feature=youtu.be
