Quote:
Originally Posted by wwest
The Prius and FEH/MMH derate the I4 and increase FE by implementing the atkinson cycle via leaving the intake valve open for a portion of the compression stroke, thereby forcing some of the intake stroke charge back into the intake manifold.
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In addition on the Prius, they actually tweaked the engine block. The crankshaft is offset from the center of the cylinders.
I'm quite sure that they didn't go that far with the TCH or HiHy/RX400. As far as I know their engine blocks are identical with the "gas" versions.