[Christ]

NO - a Miller cycle engine involves forced induction. What you just described is Atkinson cycle.

Atkinson engines work by use of an ellipsus, which allows the connecting rod's crank end to slip from a smaller stroke journal to a larger stroke journal.

The idea is that the intake stroke should be smaller, and the power stroke should be longer, which gives the best of a long stroke engine (torque) and a small displacement engine (efficiency).

Adding boost came about when it was determined at an Atkinsonized Otto-cycle engine didn't create good power, and may cause other issues with late closing of the intake valve allowing bleeding back into the intake manifold. Adding boost helps to control the intake bleed off, and adds more low-end torque to the engine.