Previous Split-Cycle Designs

There have been other similar split-cycle engine designs in the past, but they have never been able to match the thermal efficiency levels of the standard four-stroke engine.

This is due in large part to the fact that, as the gas is transferred from the crossover passage to the power cylinder in the prior engine designs, the gas has always been allowed to over-expand in the power cylinder and then must be recompressed before initiating combustion.

The extra work required to recompress the gas greatly reduces efficiency levels.

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