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Increased thermal efficiency for spark ignition engines is studied experimentally using computer simulation of a three phase heat release model. Various compression ratios, combined with advanced multiple-direct-injection techniques, are researched in an effort to extend the effectiveness of current engine designs beyond their present knock-limited compression ratio. A new ideal engine cycle is presented to demonstrate the conditions appropriate for use of 88-98 octane fuel and spark ignition with an 18:1 compression ratio. The value of isothermal combustion to achieve over 42% brake thermal efficiency is presented.

A computer simulation program has been developed to evaluate vehicle performance for record attempts at the Bonnevile Salt Flats in Utah, USA. A nine mile long straight line course is expected to be available in good weather conditions. Performance data from the unlimited automobile speed record holder is reviewed for comparison with projected speed vs. distance plots of a proposed new vehicle. The record being challenged, 246 mph, is for a limited displacement vehicle of 2.0 liters or less. The analysis provides comparative results for several techniques for enhanced performance.