SPARCS and Compact-SPARCS provides superior heat rejection and efficient thermal balancing to optimise lubrication. A problem with rotary engines is that the engine housing has permanently cool and hot surfaces when running. It also generates excessive heat inside the engine which breaks down lubricating oil quickly. The SPARCS system reduces this wide differential in heat temperatures in the metal of the engine housing, and also cooling the rotor from inside the body of the engine. This results in reduced engine wear prolonging engine life. As described in Unmanned Systems Technology Magazine, "SPARCS uses a sealed rotor cooling circuit consisting of a circulating centrifugal fan and a heat exchanger to reject the heat. This is self-pressurised by capturing the blow-by past the rotor side gas seals from the working chambers."