Pumping losses are greater in a Otto cycle engine due to the increased resistance in compressing the whole stroke. In an Atkinson-cycle you get a longer power s

Pumping losses are greater in a Otto cycle engine due to the increased resistance in compressing the whole stroke. In an Atkinson-cycle you get a longer power stoke than compression stroke and thus are more efficient. There is always another cylinder that get does i take during the short time when valve is open during compression in another cylinder. Thus that cylinder get some free assistance during intake.