Quote:
Originally Posted by Azuki
Having a harder floating valve spring will DECREASE the FPS. The Spring in the floating valve (at least in WA, and I believe in TMs too) pushes the floating valve to close it after the BB is shot. The only spring that should increase FPS as it becomes stiffer is the hammer spring.
Hammer Spring Harder = Higher volume of gas released
Recoil Spring Harder = no effect on FPS, more gas required to cock
FV Spring Harder = Potentially faster closing of valve, less FPS, more blowback pressure
Magazine Valve Spring harder = Less Volume of gas released
and vice versa.
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I'd like to hear your explanation as to why the floating valve spring will decrease the velocity. All of my measurements show otherwise, and this is the theory I've surmised on it:
The stiffer spring keeps the valve open for moment longer, thus, allowing a greater amount of gas to be ejected out of the barrel and behind the projectile before the valve closes. In other words, the FV has SLOWER closing - NOT FASTER as you have indicated!
The point of the spring is to keep the valve OPEN. It doesn't push it closed - if it did, then your explanation holds water. But in this case, it doesn't.
Regarding the original post - a 10-20fps various with gas pistols is NOT uncommon. There are many variables that can affect this, such as storage temperature of your gas, volume of gas remaining in the tank, length of time between filling your mag and firing it, etc. Personally, I would not be sweating over a 10-20fps variance - I'm actually surprised you even got up to 310fps with the stock gun. Typical velocity of a stock Marui GBB running propane is only 290-300fps.