Oil pressure spring issue

[JimWoo50]

Put the white spring in my prv last night to increase 60lb oil pressure and on engine start pressure went to the high end red line-90lbs or more. Now I'm thinking of putting the old screen and adding a couple more washers under it which would bring the total to 5. But someone once told me that 3 washers is the limit. Is this true?

[az_gila]

Originally Posted by JimWoo50

Put the white spring in my prv last night to increase 60lb oil pressure and on engine start pressure went to the high end red line-90lbs or more. Now I'm thinking of putting the old screen and adding a couple more washers under it which would bring the total to 5. But someone once told me that 3 washers is the limit. Is this true?

The 95 limit is only for "Normal Operating Conditions" per the Lycoming O-360 manual.

This is the other part of the specification -

Start, Warm-up, Taxi, and Take-off (All Models) 115 psi max.

[JimWoo50]

I'm going to run it a little harder than the 1300 rpms last night with the white spring. It seemed to be settling down to about 85 lbs before I shut down. If it stays there I may stay with it but I did not like seeing the needle right up to redline on my van's gauge.

[az_gila]

If Vans gauge does not have a max. scale physical stop, 115 psi would be pointing vertically downwards...

[aerhed]

9 washer limit as per parts catalog.

[JimWoo50]

And added 4 more washers to the old spring and oil pressure is right at 85 on startup. Perfect. Thanks a lot. Now if the weather in Chicago would finally clear I could go somewhere!