Just regrinding the cams and increasing the static compression ratio wouldn't make it operate in the Miller cycle, would only make it operate like a Prius engine, emulating the Atkinson effect. The supercharger is also required for the Miller cycle in order to overcome the discompression provided for the longer intake valve timing.
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Originally Posted by TruckFan
I've read some about the Miller cycle, but what really makes it more efficient? If you have to use a supercharger to get the same power out of the same engine then it seems that it would be less efficient per cubic inch or cc.
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Since the engine operating in the Miller cycle would still have less of the so-called "pumping losses", because its effect makes the power stroke longer than the compression stroke, the engine is, in fact, more efficient.