Quote:
Originally Posted by Nevin
So wouldn't it be good then to have the intake itself as smoothe as possible to increase velocity
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Not really, as the smoother the surface the less of a boundary layer you have. This of course has a fine line you need to follow as obviously if it's too rough then you're just messing with flow and are right back to the beginning. For example, when I port heads they all get a final blast finish in the port with a 4-600grit(pending head material) after all the port and sand work has been done. I have shown people at my shop with a CNC ported head with two ports, one polished and one 400 grit soda blasted with the blasted port having a higher velocity than the polished port on my flow bench. This is of course on the intake ports. Exhaust ports just get ported and sanded as a boundary layer there makes minute effects in exhaust velocity.