Floating　ring　bearing　systems　in　engine-oil　lubricated　turbochargers　commonly　withstand　severe　radial　and　axial　thermal　gradients.　An　engineered　thermal　management　of　the　heat　flows　out　of　the　bearing　system　is　paramount　in　order　to　ensure　the　component＇s　mechanical　integrity　and　the　reliability　of　the　bearing　systems.　Therefore,　oil　flow　plays　an　important　role　in　maintaining　an　uninterrupted　oil　film　and　removing　a　large　fraction　of　the　thermal　energy　generated　by　rotational　drag　and　the　heat　flow　disposed　from　a　hot　shaft　to　cool　the　bearings.　The　floating　rings　usually　feature　circumferential　oil　groove　on　their　outer　surfaces　for　the　increase　of　flow　rate.　This　work　presents　experimental　and　numerical　investigations　into　the　operating　parameters　of　full-floating　ring　bearings　with　a　circumferential　oil　groove.　A　comprehensive　model,　including　a　transient　form　of　thermal　energy　balance,　is　built　to　analyze　relevant　bearing　parameters　like　temperature　distribution,　mechanical　power　loss,　and　ring　speed　ratio　for　various　oil　supply　conditions.　The　Reynolds　equation　is　solved　by　a　separation　of　variables　method　satisfying　the　appropriate　boundary　conditions.　For　model　validation　purposes,　an　extensive　experimental　study　on　a　cold-gas　turbocharger　test　bench　was　conducted.　As　with　the　test　data,　the　predictions　show　that　oil　supply　conditions　lead　to　different　degrees　of　influence　on　the　operating　parameters　of　the　investigated　floating　ring　bearings.