CNC Mill Mark Removal in Intake Port

273 said
Like there's got to be an atomization range, from what a well tuned average performance engine is, to the bleeding edge of what highly developed multi million dollar race teams are doing vs what an highly competent engine builder can do. And how much R&D would it take to go from what an average guy build achieves to what a highly competent build achieves and what kind of power gains are we looking to make with these possible fuel atomization achievements in an average 300-600 hp engines ?

But at what RPM? How much throttle opening? What temperature?
Like @Newbomb Turk says: it's not just about one thing. I doubt anyone is going to sit down and try to optmize atomization in particular because on it's own it doesn't mean much. But the things which happen to also improve atomization also tend to favor increased flow, better pressure recovery, and robust performance profiles.

Modern OEM engines use direction injection to help achieve the best AFR possible. Operating conditions can change from one valve event to the next, and apparently enough so that the loss of atomization is worth the improvement in accurate fuel delivery to the cylinder. This of course isn't done in the name of performance, or even MPG, but emissions - but I think is still revealing.