[crummasel]

Exactly my point and interesting discussion.
Since the CIS sprays permanently onto the (mostly) closed intake valve i would expect the fuel to enter the combustion chamber in a more liquid state and consequently some aided turbulence would be needed to help atomising it to create a reasonable mixture. Carbs and MFI are are doing atomisation more or less synchronised to the opened valve and atomisation starts inside the inlet duct (or is helped by higher pressure spraying into te opened valve). At least this was my understanding and probably a quite static view onto a perfect world. That would imply that CIS would not reasonably work on semi heads and domed pistons.
Who would disagree to that having used domed pistons with a good result in terms of performance and fuel consumption?
If i try to doublecheck and compare with - say - BMW M10 and M30 engines i see almost no bowled pistons but more or less domed ones which would contradict to above statement. But looking closer we see that the BMW semi heads are not symetric but the valves are shifted sidewise so probably they create some sidewise swirl to help inner mixture building...
More ideas on that subject?