Quote:
Originally Posted by 98_240sx_se
what did you use to port it? hard to tell the finish in the pics.
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I ported the area near the head initially with a grinding stone that is for porting aluminum, then I smoothed it up with a sandpaper flapper bit. The runners and plentum I just worked with the flapper disc to smooth the casting defects and marks. The finish is as smooth as I would want it to be. You don't actually want to polish your ports, you want a certain finish. A small amount of roughness on the walls creates a turbulent boundary layer, which increases airflow and prevents fuel from gathering on the port walls.
11-09-2009, 05:12 PM
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