I have a 65 GTO with a fresh (1300 miles) 505 CID Pontiac V8 - aluminum heads, hydraulic roller cam, fairly mild - basically, the Pontiac equivalent of a ZZ502 or something along those lines.
I run Valvoline VR1 10w30 with a K&N filter. Cruise temps are 190. I observe the following:
If I go for a drive and just cruise, drive normally, the cruise oil pressure at 2500 RPM is about 45-50 PSI.
If I decide to beat on it a bit, a few full-throttle runs, the cruise oil pressure drops about 10 PSI.
I assume this is nothing to worry about, but I find it interesting and I don't quite understand it. Any ideas why?
I run Valvoline VR1 10w30 with a K&N filter. Cruise temps are 190. I observe the following:
If I go for a drive and just cruise, drive normally, the cruise oil pressure at 2500 RPM is about 45-50 PSI.
If I decide to beat on it a bit, a few full-throttle runs, the cruise oil pressure drops about 10 PSI.
I assume this is nothing to worry about, but I find it interesting and I don't quite understand it. Any ideas why?