Hi Sonny
In my thread with a similar problem I left you hanging.
http://www.vansairforce.com/communit...w+oil+pressure
Like you I have been dealing with the high oil temp but also marginally low
(55 in cruise) oil pressure. Mahlon has given great advice, ECi folks have chimined in, America's Engine ... who built my enigine .... have also given advice, and finally the local A&P has been a help.
The advice has been all over the map. Vernatherm, oil pressure regulator, blocked oil cooler, bad baffling (I have a Robbie Attaway style lid not rubber againts the cowl for my air recovery), and so it goes.
Unlike you I started with the oil pressure regulator. Installed a new heavier spring and guessed at the proper screw setting. No joy on my last flight. Higher oil temps, and as Mahlon suggested very high oil pressure on take off. But the oil pressure in cruise was higher in the mid 60's. But......
On close inspection of the engine compartment during the oil change, oil pressure regulator spring change I noted a line of oil streams heading up the back of the fire wall from the bottom flange. They went up about 3 inches.....sorry know pictures I just cleaned it off with out making the connection that oil dropletts should be going down not up. So maybe my Vetterman four pipe exhaust is restricting air flow thus causing a high pressure area thus ......you get the idea.
So I will be doing some surgery on my cowl to increase the area of the outlet. I am going to calculate the area differential between the inlet and outlet. (I guess it is supossed to be 1 to 1.75)
I also plan on doing the vernatherm check as you are doing to prove / disprove it's function. I read in a Lycoming circular that an easy check is to get the engine above 180 and check the oil cooler lines to see if they are as hot as the oil sump and to also check the oil cooler to see if it it also hot or has cool spot ( indication of air blockage in the cooler).
My plan is to unscrew the pressure regulator screw at least three turns. Go fly and check results. But, if Mahlon is correct temps will probably remain high with the pressure going down down down..... On the other hand maybe ECi and America's Engine folks will be right and I will hit the sweet spot for oil pressure regulation and oil Temp.
Then I will do surgery on the cowl if necessary.
Then the vernatherm...................So I will follow your thread closely to see how your plan works out and to see if you can overcome what some say is the bad design in the oil filter adapter. I have the same setup so maybe that is why I choose the easy route of the oil pressure regulator and hope that it is the culprit.
At the end of the line one of us is going to have joy when we solve this situation.
I have really enjoy all the threads on this issue and especially engine gurus like Mahlon who are willing in give we mere mortals free advice.
PS:Mahlon ....when do you sleep ...... 4:47 AM is pretty early to respond but thanks a bunch or your help!!!!!!!
Frank @ 1L8 ... Fly and Tracken with MT_RTG