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by Tade0 29 days ago
> cannot we dynamically switch between Otto and Atkinson cycles by just changing valve profiles?

Toyota introduced this exact behaviour with their "Variable Valve Timing-intelligent Electric" (VVT-iE) system:

https://toyota-club.net/files/faq/16-01-01_faq_vvt_ie_eng.ht...

It uses an electric motor to control intake valve timing.