Ragnarok wrote:I've detailed my thoughts on piston valve opening times already.
Any decent piston valve already opens fast enough (a couple of milliseconds) that even being able to halve the opening time will only yield a few more feet per second.
For those that like data, figures calculated for 3vo with various valve speeds can be found at the link above. In its case, the improvement of a valve that opens instantly is only 1% more energy than a 4ms valve - and in reality, its valve will open in around about 1 ms. Any further effort to further lower that can't even offer me another whole joule on the muzzle energy.
If you want to find ways to improve piston valve performance, then don't focus on valve opening time, it's good enough already. Focus on bringing up valve flow.
This is right on. Even if you did spend enough time designing a sealing face that is only the sealing face so it doesn't way hardly anything, I don't think you would ever notice the difference. One thing that I could improve on my piston (others as well possibly) is the opening distance and the pilot volume. This wood greatly improve the efficiency (correct me if I'm wrong Ragnarok) of the valve a lot.