It doesn’t. Swirl, twirl, tumble, bumble all that are CAFE emissions stuff. Any time you make the air column change directions you lose velocity. That is a power killer.
Unless you are trying to light cats on a cold engine fire up or think this type of thing saves the world, it’s useless.
Edit: plug location and rod/stroke ratio are the two biggest factors in total timing. Swirl, twirl and all that and quench doesn’t affect timing very much if at all.
