My 914-6 GT Tribute, low oil pressure when warned up. Options

[mlindner]

Every thing seems fine, start up, warm up all good oil pressure reading. But after a while at idle the oil pressure gauge is almost nothing. Running 20-50 valvaline for brake in. Should I go to straight 60 wt race oil. This car is mostly a track car, or when driven on the street it likes the 5 to 7,000 rpm range. Not a cold weather 914. Thanks, Mark

[mlindner]

Thanks Pat, a little more information. The engine was a long block bought about ten years ago down in Florida by a guy taking 911 race cars back to street. All he new was it is a 2.2 E, with S pistons and cams. The engine now has PMOs, Mod-Solex cams, S pistons, good leak-down etc. No idea of main bearings/oil pump. I did install the reduced cam oil fittings. On start up ( garage at 68 deg) the oil pressure is at 30 psi or little higher. Backup, gauge is a 911 type combo gauge with 0-20-60-100-140 PSI. Warmed up 2 to 3,000 rpm 60 to 100 psi, at 6,00 rpm runs between 100 and 140 (10bar). All that looks and feels right. Oil temp is also normal, 180 to 200 deg F. But after with the thinner oil at Idle is when the oil pressure is almost nothing. The 911 forums, this comes up a lot. Oil light comes on at idle. Best, Mark