Originally Posted by
pbjosh
If you were getting 280 on a spring, cutting it short won't add velocity. Ha! You still have to put a certain amount of energy INTO the valve stem to get an effect - the hammer and spring balance you had before stores a certain amount of potential energy. To replicate your situation for 280 fps you would need a heavier spring that traveled a shorter distance to store the same energy, as in, the IVG is all the way back. Then the spring would have come to full extension before contact with the stem, allowing for a faster closing setup. Though with a heavier hammer, to some balanced extend, you could have more hanging energy in it's mass - making the valve dwell a bit higher. The AKA valve only needed to open 1/16th of an inch to get full velocity.