Andy Ross wrote:

But the idea behind YASim is to produce plausible results for all
possible engines; oil pressure is one of those values that is (AFAIK)
just too engine-specific.

Further to the point, here is some information from the Lycoming O-320 Operator's manual; it would make a good starting point for horizontally-opposed piston engines.

Oil Temperature:

  180 degF desired, 245 degF maximum
  [down to 160 degF and 210 degF below 10 degF OAT]

Oil Pressure:

  Normal: 90 psi maximum, 60 psi minimum, 25 psi idling
  Start and warm up: 100 psi maximum

All the best,


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