Fred:
Do the turbo injectors have better air passages that allow them to do a better atomization job than the normally aspirated injectors, even when installed in a normally aspirated engine?
No, I do not think so.
Said another way, for the same delta P do the screens on the NA injectors restrict air flow compared to the turbo injectors with their air shroud and supply line?
Or is 0.5 inches Hg enough at WOT cruise?
I can imagine that a well-designed ram-air upper deck line could produce more than a .5" Hg improvement.
This “reverse pressure delta P” would reverse the injector air flow, and may cause the blue staining that was mentioned around the NA injectors. It would also cause poor atomization that becomes most evident operating LOP.
Yes, but as a general rule, the typical blue staining is from the fuel bubbling out AFTER shut down as it vaporizes in the lines.
Walter