In this study, the recovery of heat energy lost to engine coolant (Ec) in a liquid cooled, gas (propane) fueled spark ignition (SI) using thermoe-lectric generator (TEG) is experimentally researched. A two-layer rectangular geometry TEG designed, consisting propane exchanger (P_hex) lo-cated on surface an (Ec_hex). 20 items thermoelectric modules (TEMs), each 30x30 mm dimensions, are placing be...