Howard wrote:

I can't help but wonder about the benefit of the Miller cycle..... seems to
me that the energy expended pumping the air into and out of the cylinder
isn't going to be a great deal more than that of working against a throttle
plate.   It seems to me that the same or virtually the same thing could be
accomplished simply by going with an extreme compression ratio as must be
done to make the Miller cycle work properly..... I'm assuming 14:1 or
higher..... and throttling the engine down to keep things within range.

Maintaining a minimum amount of manifold vacuum using a second butterfly
operated by a diaphragm should accomplish pretty near the same thing.
Energy used creating vacuum is recovered on the compression cycle anyway.
An additional benefit would be the constant high vacuum which would enhance
atomization / vaporization of the fuel.

                     H.W.

 
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