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There is a growing requirement for lightweight high performance engines capable of operation with heavy fuels such as JP5 (F44), JP8 (F34) and diesel fuels as well as maintaining the capability of running on unleaded gasoline. Traditionally heavy fuels are associated with operation in compression ignition engines which exhibit poor power to weight characteristics. Today's engine applications call for much greater mobility and flexibility in use, especially in applications such as outboard engines, motorcycles, All Terrain Vehicles, Light Aircraft and portable generator sets. Compression ignition engines with their poor power to weight and vibration characteristics are less likely to succeed in these applications. These requirements are more likely to be met by the development of a spark ignition engine capable of operating on these heavy fuels.