These Italian engines seems to have pretty low idle oil pressures
Urbancamo wrote:We all like imperial units for sure.
But how much there is pressure when your coolant is at operating temp and oil is real hot? Usually it takes at least two times more driving to heat oil than coolant. We don't usually drive in idle.
So we are interested what readings you are having in operating rpm range.
But depending how accurate your mechanical gauge is, I think there is nothing wrong in your engine. For pressure light flickering, somebody else can leave thoughts, now it's too late for me to think (almost midnight here)
TomLouwrier wrote:60 psi = 4,1 bar
50 psi = 3,4 bar
15 psi = 1,0 bar
20 psi = 1,4 bar
75 psi = 5,2 bar
1,0 at idle may be a bit lowish, but I see no big problems here other than your max oil temp.
Why would 75 be too much, why should the relief valve be set at 60? The instrument in my Spider (BS1, 1608 engine) has a scale of 0 to 6 atm (more or less the same as bars). I've always had it near full scale, certainly over 5 at normal cruising speeds.
Remember that pressure in itself is not all that counts. Bearings in an engine are not hydrostatic but hydrodynamic. The real oil pressure is built up by the drag of oil film between crank and rod (or cam and head) which comes from their relative rotation. As long as the pump delivers more volume to the bearings than the bleed down rate, those surfaces are kept wet enough to maintain their lubrication. Oil pressure, especially in the main gallery, is just a convenient indicator of the system's overall performance.
Get yourself a good manual on your engine. Someone wrote down what it was built to give, takes out a lot of guessing.
Tom (off to bed as well)
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