Increasing concern on the environment and energy security boosts the technological development of internal combustion engine with the main objectives are higher overall efficiencies and lower emissions. Split cycle engine is one of the unconventional solution for the current established engine technology. However, its high pressure ratio intake between the crossover port and power cylinder creates a supersonic intake flow that are difference from the existing in-cylinder flow behavior. Therefore, in this report, the effect of crossover port pressure to the in-cylinder flow is investigated using simulation tools. It was found that the swirl and tumble intensity in the cylinder is increasing with higher pressure ratio. © 2018 Author(s).