(Spyder Animation courtesy
Lets Look at the Physics
The initial release of gas is controlled by how long that
valve can remain open. That valve has its own spring inside it to
re-close after the bolt is reset.
So the more Force that can be delivered to the valve wider
the value can open
F=Spring Force, k=Spring Constant, X=Compressed Distance, Xo=Initial
If the positive Axis is down the barrel then X is less then Xo making
this force in the positive direction
since the mechanics of the gun require a trigger latch and the valve
distance cannot be changed this leaves only one variable
the value of k can be changed
by replacing the spring with one of the same dimensions but stiffer.
Manufactures sell spring kits for this reason, older guns with more
friction in the bolt slide need stiffer springs to open the valve.
The spring is trying to do Work on the valve. It
applies a force through the small distance that the valve requires to
While this is happening Friction in bolt slide is creating negative
work on the bolt.
This work done by friction is in the opposite
direction of the spring work which decrease the amount of work done to
F=Friction Force, μ=coefficient
of Friction, N=Normal Force
Friction always opposes motion, here the bolt is moving in
the positive direction because the spring force is positive.
Frictional force is then in the negative
direction. If the goal is to increase the performance of the marker
then there is two variables
The coefficient of friction can be lessened by lubricant. Also the
Normal force between the bolt and slide can be lessened by replacing
the bolt with a lighter version.
Work done to the Valve
The amount of distance the valve covers
is limited by the dimensions of the marker, meaning at some point no
more work can be
done to the valve.
To ensure your marker reaches that point these equations will