An　organic　Rankine　cycle　(ORC)　can　be　used　to　harness　the　wasted　heat　from　an　internal　combustion　engine.　In　this　paper,　the　characteristics　of　a　novel　system　combining　a　gasoline　engine　with　a　dual　loop　ORC　which　recovers　the　waste　heat　from　both　the　exhaust　and　coolant　systems　is　analyzed.　A　high　temperature　loop　recovers　the　exhaust　heat　while　a　low　temperature　loop　recovers　both　the　residual　high　temperature　loop　heat　and　the　coolant　heat.　The　performance　map　of　a　gasoline　engine　is　measured　on　an　engine　test　bench　and　the　heat　quantities　wasted　by　the　exhaust　and　coolant　systems　are　calculated　and　compared　within　the　engine＇s　entire　operating　region.　Based　on　this　data,　the　working　parameters　of　a　dual　loop　ORC　are　defined,　and　the　performance　of　a　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　by　from　14　to　16%　in　the　peak　effective　thermal　efficiency　region　to　50%　in　the　small　load　region,　and　the　absolute　effective　thermal　efficiency　increases　by　3-6%　throughout　the　engine＇s　operating　region.　(C)　2012　Elsevier　Ltd.　All　rights　reserved.