Tbone
Well Known Member
Need help from some of the lycoming guru's. I have a friend that is running an IO360A1A with full inverted system. A few months back the oil pressure would fluctuate from about 70 psi to about 60psi. It only happened when inverted. Now it is getting progressively worse even in normal flight attitude when you drop the wing. Was told that the inverted system was looked over and the guage was replaced but with the same results. I remember in a past post that the adjustable oil pressure "valve" could be wrong in certain lycomings. He had a "shim" adjustable type originally but at some time went with an externally adjustable type. Any ideas?