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The Development of the Szorenyi Four-Chamber Rotary Engine

A four-chamber Otto cycle rotary engine, the Szorenyi Rotary Engine, has been invented and developed by the Rotary Engine Development Agency (REDA) in Melbourne, Australia. The engine concept has been awarded a U.S. Patent (Number 6,718,938 B2). The stator of the Szorenyi engine is a similar shape to a Wankel engine. However, the geometric shape of the engine rotor is a rhombus, which deforms as it rotates inside the contour of the mathematically defined stator. This geometry results in a rotor with four combustion chambers. Each revolution of the crankshaft produces one revolution of the rotor and four power strokes. In contrast, the Wankel engine produces one power stroke per crankshaft revolution, although the crankshaft rotates at three times the rotor speed. The Wankel engine is redlined at 9,000 rpm due to its eccentric rotor causing excessive deflection of the crankshaft above those speeds. The deflection can result in the rotor contacting the stator and side-plates of the engine. The Szorenyi engine has a symmetrical rotor and has no such speed limitation. As such, the Szorenyi engine has the compactness of a Wankel, turbine-like power delivery due to its symmetrical rotor, and greater power density than a Wankel engine at engine speeds above the rev limit of the Wankel. The engine geometry has been translated to a prototype engine design. The prototype engine has been constructed and a successful proof-of-concept engine test conducted. RMIT University has conducted ideal mathematical modelling of the engine geometry and fuel burn. The model analysed the Szorenyi engine, the Wankel, and a reciprocating engine of the same displacement. This modelling has shown that the Szorenyi engine thermal efficiency is 0.46% greater than the reciprocating engine and 0.38% greater than the Wankel engine. The prototype engine used in the proof-of-concept test now has redesigned rotor hinges, and that engine is awaiting a program of further testing to assess engine performance. Also, the RMIT University mathematical modelling of the Szorenyi engine, while providing good results, is ideal and so more complex modelling is required to more accurately predict performance. The Szorenyi engine could be used in any application where the reciprocating and Wankel engines are used. The advantage of the Szorenyi engine is the higher power density, smoother power deliver, and higher thermal efficiency than reciprocating and Wankel engines.