(57) The invention is concerned with a method of deriving mechanical work from a combustion
gas in an internal combustion engine and reciprocating internal combustion engines
for carrying out the method. The method includes the steps of compressing an air charge
at least partially in a compressor of the engine, transferring the compressed charge
to a power chamber of the engine such that no appreciable drop in charge pressure
occurs during transfer and admission to the power chamber, causing a predetermined
quantity to produce a combustible mixture, causing the mixture to be ignited at substantially
maximum pressure within the power chamber and allowing the combustion gas to expand
against a piston operable in the power chamber substantially beyond its initial volume.
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