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i just read that article, too. as a note, the 13:1 compression ratio is a little misleading for atkinson cycle. that is the mechanical compression ratio but the effective ratio is lower (i've been trying to find the actual number but have been unsuccessful) due to the late timing/close of the intake valves on compression stroke.

as far as boost...i'm expecting to see perhaps a 5-8 psi boost range? i wonder how it will affect gas mileage. very excited to see this come to market just because i want to see it, although i wouldn't get it myself.

here's a picture of the custom supercharger setup:
 
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