We all know there will be a new 2.0L 4-cylinder turbo engine debuts together with the upcoming 2015 Lexus NX.
There is more information coming from AutoWeek today. Here are the summary and a little bit of our analysis.
– This engine will also work similar to the RC-F’s V8, the way the valvetrain design will use the Atkinson cycle to improve fuel efficiency during low load situation, and switch back to the normal Otto cycle under heavier acceleration requirements. Lexus named this valve technology to be “VVT-iW”
– It is the first time the hybrid cycle mode (Atkinson <=> Otto cycle) paired with the turbo application
– We estimate the compression ratio for this engine will be between 11.0:1 and 12.0:1. Reason: the Otto cycle working requirement forbids even higher compression ratio such as 13.0:1, for the cost of this product; and also the turbo application makes high compression ratio actually not necessary to achieve the desired fuel efficiency
– This engine will be firstly mated to a 6-speed automatic transmission
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