Quote:
Originally Posted by Thenooblord
no, because the port extends past both sides of the piston oring as the piston moves by, it just means the air would move to behind the piston as opposed to outside the cylincer
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Not true as the port is designed to vent off a large amount of air. Even if it does allow a small momentary airleak as the o-ring passes over the port cut-out, taping a port will restrict the amount of air vented out substantially over a completely open large sized port. Make sure you do it properly and don't have a sticky wall facing in.
Your milage will vary but I've had 60 FPS increases from taping ports when matched with an appropriate length barrel. This is only a short term solution though and an actual unported cylinder should be purchased if you want to do this reliably.
Regarding the issue of SRC cylinders being unported - that's just a thing I've seen on most SRC cylinders. Maybe they don't make any ported cylinders. If you watch Ken's video, that one's unported as well.
http://www.youtube.com/watch?v=cQkMb...embedded#at=28