They've been doing it for years. Nissan 2.4L had it in the 80s. My impression is they need the burn time of the mixture to be as fast as possible while still being a controlled burn, so they make sure the mixture is squished and moved during hte last few degrees of the compression stroke, then they light it from opposite ends so it takes 1/2 the time with less loss of efficiency.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.