The miller cycle engine. (Mazda) Small 6-cyl, 4-valves per cyl. With a little huffer and dual intercoolers. Pretty standerd stuff, right? The funky part is the valve timeing. The intake valve is held open far-into the compression stroke. Basicaly, cutting the compression stroke in half. This also cuts the pumping losses in half, as the piston does not have to compress an "Over-Filled" cyl of air. (and therefore, increases efficiency) As the piston is on the up-swing on the compression stroke, normaly, the freash charge in the cyl would end up-being pumped back out, into the intake manifold. But, the blower keeps the flow neutrilized at the valve. *I assume*, -This is where I kinda loose it, I'm not sure where the "flow" is, if any. And how much is being compresed. But thats kinda of irrelivent*-. The spark ignites the A/F mix, and forces the piston down the bore. Now this is the fun part, The piston has a full-range of motion on the power stroke, so the engine can extract every ounce of power avalibe. So, the Miller cycle engine has: - The efficency of a smaller displacement engine. (Higher fuel economy) - The power of a larger displacement engine. (Higher-out-put, due to the extended power stroke) I didn't know where else to post this. Another thread, got me thinking about "funky" valve timeing, and I didn't want to swipe that thread.