Quote:
Originally Posted by Sneaky Pete
Quote:
Originally Posted by AutoTalent
Oil Pressure: Oil pressure does seem to decrease slightly with BE Bearings. This is most likely due to the extra clearance. But the amount of decrease is between 2-3 PSI, over a 70+ PSI average. Assuming the 73 PSI average, a 3 PSI pressure drop is equal to 4% of the total.
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How will this overall system oil pressure drop disrupt the pressure gradient within rod bearing oil film though? |
The strength of the wedge is not reliant on system pressure, the strength of the wedge is a result of the journal spinning against the wedge of oil. Actual pressure on the wedge is much higher than system oil pressure.
System oil pressure just ensures the bearings have a constant supply of oil to make up for loss of oil that is squeezed/spills out the sides of the journal bearing.
Specs as per BMW for acceptable oil pressure of the S65 is 4-6 BAR or 58-87 PSI. Even with the 3 psi drop in pressure with the BE Bearings the engine is comfortably within the accepted range for oil pressure.