Quote:
Originally Posted by SNK
I'm not very clear on all these mechanisms in action but I can tell you for certain that before I covered up these ports, I could feel a lot of air being blown out of the port on each cycle as the piston moved forward. Despite whatever has occured, I've improved the efficiency of my guns and the amount of air moving through it by taping over the port and having less escape on each compression. I don't know whats happening. All I have is results and I tested this thoroughly. I chrono'd 30 bbs before and 30 bbs afterwards (well within 10 minutes as taping the port is easy) and the gain is a reliable 30-40 FPS without question.
I wasn't dumb enough to put the adhesive side on the inside. I have another piece of tape in between with a smooth surface facing the inside of the cylinder.
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I'm not doubting your results. All I'm stating is that this is not recommended as a permanant modification, but your results are interesting. Of course you will feel air blowing out of the uncovered port... it's there to expend "unnecessary" air volume prior to the actual compression cycle.