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Originally Posted by Big-Foot
The Engines we are dealing with here are (for all intents and purposes) standard Otto Cycle 4 stroke engines that have a special valve timing mechanism (VVT).
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Although I'm not sure how VVT works, I think there is more to it than that, considering Toyota uses VVT in pretty much all their engines, hybrid or not. I'd guess that the amount of valve timing adjustment made by VVT is relatively small compared with the valve timing design difference between a hybrid and non hybrid engine.