Originally Posted by russc
I tested the first Gen valve fairly extensively.
I found that the buna oring works best as the seal and did not blow out. the Teflon seal was very finicky and I assume delrin would fare no better.
I also found that the external spring was more trouble than it was worth, especially when it came to testing different spring weights. I found basically no difference in efficiency when I went back to a standard spring setup, but again that could be because of springing. I also found that it magnified tolerance differences between powertubes since the valve retainer doesn't guide as much as on a stock valve.
You need to test newmaticarsenal's
kit with the huge internal dimensions.