Experiments are described into the effect of surface finish and clearance upon the value of ZN/P at which a water-lubricated plain journal bearing begins to operate hydrodynamically. It is shown that clearance ratio has only a small effect and that the measured values of the critical ZN/P are between values calculated from the narrow bearing theory of Dubois and Ocvirk and those calculated from the infinitely long bearing solution of Cameron and Wood.
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