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You don't need reversing pistons to accomplish compression and combustion and the piston in cylinder has survived any effort to render it obsolete for good reason. It represents the greatest volume for the smallest surface area which means lower heat transfer to the cylinder walls and it retains it's sealing capabilities through huge variations in operating temperature. 100 years ago the Rolls Royce Silver ghost would, on occasion, start after sitting overnight, without being cranked over, from the remaining compression.
Turbines require compounding which uses the exhaust heat to power another method of extracting energy from otherwise wasted heat energy. That is how a turbine can surpass the efficiency of the very large diesel engines, but it is only practical in stationary applications.
Best non compounded turbine efficiency is in the range of 35%.
Bottom line is get rid of the reciprocation, but retain the piston in cylinder configuration.
regards
mech
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