Stratified Charge Rotary Engine Developments at JDTI from 1984 to 1991

John Deere Technologies International (JDTI) developed several different Stratified Charge Rotary Engines (SCREs), using 3 module sizes, .66,1.7,and 5.8 liters/rotor, over a period of eight years starting in February 1984. This paper summarizes: the principal technical features, performance results, supporting research efforts and current status of the 60kW (80HP) to 840kW (1125 HP) engine series, updating and referencing key related JDTI publications. All of these engines are Wankel-type, direct injected and turbocharged, featuring extremely wide range fuel capability and economy competitive with comparably rated Diesels. In addition to reviewing development of the SCREs, the paper briefly discusses test of a naturally aspirated, natural gas carbureted spin-off of the largest engine series.