Acceptable oil pressure in a Kent FF

Hi Guys

I need advice (maybe just reassurance). My engine runs Motul 5/30W. Its supposidly fresh ish (10 hours racing). New oil pump. On cold start up we have about 60psi oil pressure. If I warm the engine to 80 degrees, let it soak, then rewarm just before the race, we run an oil pressure around 45psi for the first few laps (at race revs, taken on the MyChron 3 XG data) but by the end of a 20 lapper we are down to 35 psi. Its always at 80 degrees water. I have big radiators and a thermostat. Leakdowns are around 6-8%. Air temp varies from 60-90 degrees.

I am guessing the oil temp is going up and the viscosity is going down.

Is this cause for concern? Is the bottom end getting baggy? Is 35psi too low.?

Thanks in advance for the input.

Mark

Acceptable oil pressure in a Kent FF