Quote:
Originally Posted by gtengr
Exponentially increased inertial forces at higher rpm in combination with a reduction in film strength due to the increased shear rate (bearing is spinning faster on the journal). The common rule of thumb with oil pressure is that the supply should be on the order of 10 psi per 1k rpm. What is the equivalent rule of thumb that relates high torque to oil pressure and low rpm?
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As you stated, lower rpm = lower oil pressure.
The journal at the rods, due to low pressure and high load, can "push through" the oil layer at the bearing.
Therefore under high load there is a draging effect at the bearing.
This dragging effect can and does contribute to wear.
Dragging at the bearing can and does contribute to rod failure through excessive plastic deformation of the rods.
By excessive I mean more plastic deformation that the rod was engineered for.