The complex/chaotic area of practicable flow dynamics - does tend to cruel those simple assumptions T-C,Tommy Cookers wrote: ↑Sat Aug 19, 2017 1:04 pmcharge distribution problems can be worse with DI or PI than with carburation or similar at the throttle bodyJ.A.W. wrote:.......As BMW found & Bristol belatedly confirmed, radial engines - with their inherently problematic mixture distribution, did gain significant benefit from direct injection.
& Bristol had found that sleeve-valve merits included ( as Ricardo predicted) certain flow dynamics,
which enabled aspects of improved port injection performance, too..
(for the best current appreciation of the practicalities the appropriate forums can be googled)
DI helps in low boost engines by enabling the raising of CR .....
it loses in high boost engines the large saving in supercharger work etc of fuel-evaporation cooling
case in point, a flow choke/stall of a fuel-air column can cause problematic 'back-firing' - & it can't, with DI..