Fastbird93

Nope. The typical though process is that a slightly rough surface on the intake side will cause a minal amount of turbulence but enough to help mix the air/fuel better. On the exhaust side and the combustion chambers, if they're polished then they'll supposedly be more resistant to carbon build up.

But, as SStrokerAce pointed out, you can't avoid carbon build up, and "the surface of the port doesn't mean dick."

Fastbird93

But if what you're saying is correct, then the McDonalds people would not be able to effectively utilize the enhanced capacity of the larger cross section in the Mcdonalds straw, and subsequently would run out of breath trying to get a satisfying drink. Meanwhile the Wendys eater would be happily sipping his beverage of choice in just the right amounts because his lung capacity can effectively draw in the right amount of beverage through the thinner straw.

ShawnMacAnanny

The Wendy's straw would not be able to carry as large a capacity at a given velocity. Flowing 262cfm through the Wendy's straw would cause it to reach critical levels of sidewall pressure. This straw could rupture at any time. The Mcdonald's straw could flow approximately 337cfm before it's structural integrity was compromised.

Should a heathly eater with both the lung capacity and stamina required to efficiently use the larger diameter straw, dine at McDonald's, he will be much more satisfied with his beverage. This is Natural Selection at it's best in the chain restaurant business. If you aren't heathly enough to ingest your drink with the speed and capacity for which it was deisned, subsequently you lose weigh in excersizing your fluid intake limits. Eventually they will progress to safe levels where you maintain and control the levels of liquid you consume.

The straw is not a limiting factor, it is an area for improvement. Your body either evolves to accept the new capacities, or you die from dehydration. "Two mice fell into a bucket of cream. The first mouse quickly gave up and drown. The second mouse paddled and churned until that cream turned into butter and he was able to climb out"

Mystic97Z

air will move faster over a smooth surface, compared to a not smooth one

LT4orbust

it sounds more like comparing a sbc to a bbc, anyways i'm off to mc donalds

unvc92camarors

that was my line of reasoning
not sure if it better to have smooth porting or better mixing

SStrokerAce

Um actually no. If we are talking about the difference between what a 80 grit roll leaves and a polished surface there is zero difference. The short side of the port is a area where there is a lot of attention paid to this since people want to make sure the air sticks to it.

All fluids (air being the one we are talking about) has a boundy layer and there is virtually no movement on the surface of the port.....

There is a good post in advanced tech about "boundry Layer" if you do a search on that in quotes you'll probably find it.

Bret