Existing Wankel rotary engines available on the market typically use either closed-loop, oil-cooled or forced-air-cooled systems. AIE’s innovative Compact SPARCS cooling system combines simplicity of design with the inherent high power-to-weight advantage of rotary engines, while practically eliminating the drawbacks these systems had in the past. The concept behind Compact SPARCS is the use of self-pressurising blow-by combustion gases which have escaped into the interior of the rotor working chambers via the rotor’s side seals. The pressurised gas is then re-circulated together with atomised oil in a completely closed circuit by means of a main shaft-driven internal impeller that thermally balances the engine. As it re-circulates, the oil-gas mixture passes through the engine’s rotor, absorbing heat before being ducted through an integrated heat exchanger within the engine’s rotor housing. This integrated intercooler rejects heat into the engine’s rotor housing and ultimately to the engine’s main liquid cooling system. The resulting benefits are reduced wear, no wet oil loss, longer time before overhaul, and increased engine life.