A split cycle internal combustion engine 100 comprising: a compression cylinder 10, a combustion cylinder 20, a crossover passage 30 and an inlet valve 18 for controlling flow of working fluid from the crossover passage 30 into the combustion cylinder 20, the inlet valve 18 is operable to move between an open state and a closed state; The engine includes a controller 60 arranged to receive an indication of at least one of: (i) a pressure and (ii) a temperature of working fluid in the crossover passage 30; In response to determining, based on the received indication, that the pressure and/or temperature of working fluid in the crossover passage 30 is below an input threshold, the controller 60 is configured to control the pressure and/or temperature of working fluid so that it flows into the combustion cylinder 20 at a speed greater than a speed threshold. Also defined is a split cycle engine in which the controller selects the inlet cross-sectional area defined by the inlet valve 18 so that working fluid flows into the combustion cylinder 20 at a speed greater than a speed threshold.
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