The plain bearings in normal internal combustion engine do not rely on oil pressure to float the insert over the journal. They rely on a continuopus supply of oil to refresh that squeezed out. If the pressure is sufficient to get oil to the bearings, it will be fine. Exceptions are bearings and pistons cooled by the oil. The reduced flow of near no pressure can overheat journals that are subject to high temp. Jet orifices directed to piston skirts that do not supply sufficient volume far enough will cause burned pistons and siezed engines. Engines with hydraulic Lifters or other hydraulic Oil pressure related adjustment systems (including cam timing) will not be happy. Old simple tractors live with little pressure for a long long time. (not recommended) Jim
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