Some numbers stock hammer, cut down hammer, valve mod

I’m pretty sure that cutting the hammer down increses the speed at which it travels also. By being shorter it has further to go compared to what it was. I would rather cut mine down then drill holes in but I have no lathe to cut it down.

What did you think of my idea to increase valve return spring strength to bring the curve upwards in power. Any input?

Rusty,

You are working on the same thing I am trying to do. What was your main reason for cutting the hammer shorter? Less weight? Or are you trying to get a bit more speed from the spring (longer distance to travel)?
I was thinking of drilling a few holes in the hammer to reduce weight. I charted your 2nd to last string but am trying to figure out how to put it in here. Any help anyone? Also, got a question….it seems that the only time a curve can start (as opposed to always being on the far side of the curve) is when the valve return spring starts to overpower the pressure inside the tank. When the pressure is high…all the shots go downward in velocity. As the pressure in the tank decreases, the valve return spring starts the curve. With a normal valve, spring, and hammer….this valve spring dominance dosen’t usually start until the pressure is low – probably less then 2000psi or so. What would happen if a stronger valve spring was used? This would enable the valve spring to start the curve at a higher pressure, therefore giving higher velocity, and therefore giving more consistent shots. This is the direction I am trying to go. thanks for any input

Edit – I just charted your last string and from shot #10 thru the rest of the shots, velocity is on the back of the curve (decending).

2nd edit – trying to put the chart in here – dark blue line is the 2nd to last string, purple line is the last string.

What pellet weight/brand?

Very nice! can you post a pic of how your hammer turned out? and of course all the details…

Jim.

Yes, with a but,,,,,,,,,,, with all my valve mods and tophat adjsutments it has always seemed to me that the most consistent strings come when i have more preload on the spring, like in the 8 range. You could shim the front of the PW out as much as you have taken from the hammer to gain the distance back. Thus you gain extra compression on the hammer spring which might be needed as you lighten the hammer. Yes, the travel is the same but mass x velocity applies, if i’m thinking correctly.

Also every single modded valve, tophat adjustment i’ve done has rendered the PW almost obsolete in terms of controling velcity. It does help fine tune consistency, but does little to gain or reduce power. So the preload has to be taken into consideration as you shorten it and restrict the compression of the hammer spring.