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So with Atkinson conversion it again comes to tradeoff: more mpg vs. power.
As I understand it Atkinson conversion can be made without cam timing adjustment. Instead it can be done by raising the static compression ratio and limiting the throttle opening. Throttle opening limit dependent of the engine revs. But this is not safe, because if one accidentally opens the throttle full, he will blow up his engine.
-raise the static compression ratio
-limit throttle opening (dependent of engine RPM, lower the rpm --> less max opening)
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