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Does more air in the cylinder mean more compression rate or does the length of the piston matter in this case?
More air in the cylinder (above ambient pressure) can change the effective Compression Ratio. The piston stroke (not length) does affect the Compression Ratio.
So the difference in the cylinder and the manifold causes the air to be sucked in the cylinder when the pressure in the cylinder is less than the manifold then it causes the cylinder to have more air which can change the effective Compression Ratio. Is this what you're referring to? Sorry for my English
Yes, either a pulse of air (tuned intake for a normally aspirated car), or extra pressure from forced induction, can both lead to an increase in air mass, which changes the effective compression ratio.
Ram Air systems will also play a bigger roll into that as well
