A　small-scale　organic　Rankine　cycle　(ORC)　can　be　used　to　harness　the　waste　heat　from　an　internal　combustion　engine.　In　this　paper,　the　characteristic　of　a　novel　system　combining　a　vehicular　light-duty　diesel　engine　with　a　dual　loop　ORC,　which　recovers　waste　heat　from　the　engine　exhaust,　intake　air,　and　coolant,　is　analyzed.　A　high　temperature　loop　recovers　the　exhaust　heat,　whereas　a　low　temperature　loop　recovers　the　residual　heat　from　the　high　temperature　loop　and　the　waste　heat　from　both　the　intake　air　and　the　coolant.　A　performance　map　of　the　light-duty　diesel　engine　is　created　using　an　engine　test　bench.　The　heat　waste　from　the　exhaust,　the　intake　air,　and　the　coolant　are　calculated　and　compared　throughout　the　engine＇s　entire　operating　region.　Based　on　these　data,　the　working　parameters　of　the　dual　loop　ORC　are　defined,　and　the　performance　of　the　combined　engine-ORC　system　is　evaluated　across　this　entire　region.　The　results　show　that　the　net　power　of　the　low　temperature　loop　is　higher　than　that　of　the　high　temperature　loop,　and　the　relative　output　power　improves　from　14%　to　16%　in　the　peak　effective　thermal　efficiency　region　and　from　38%　to　43%　in　the　small　load　region.　In　addition,　the　brake　specific　fuel　consumption　(bsfc)　of　the　combined　system　decreases　significantly　throughout　the　engine＇s　operating　region.　(c)　2012　Elsevier　Ltd.　All　rights　reserved.