Confusing Oil Pressure / Temp issue

[kbecker]

I just went through this on my annual inspection yesterday. I was running 30 psi in cruise and wanted it around 40.

I purchased the replacement springs though Spruce, looking up the numbers in the IO360 IPC. The new springs were slightly shorter than the old ones, but made of larger guage coil.

My rear engine originally had the pressure adjustment just about all the way in, and changing the spring, which is stiffer, allowed us to adjust the pressure in the midrange.

The front engine adjustment was about 1/2 of the way in--changing the spring made the pressure too high, even at the lowest setting. So we replaced the front spring with the original one and turned it in somewhat to dial that pressure in.