Effects of valve-stem length on Co2 performance...

Here’s what I got:

Gun is a Higgins branded Crosman 180, with no provisions for adjusting hammer strike. It’s a real gas hog, 20-25 good shots before power starts dropping.

Would like to rein it in some.

Thinking, if I shortened the valve-stem a tad, the valve-blow would be abbreviated, and less pressure released.

Has anyone experimented with this? Might just have to dremel it down, 1/8” at a time and record the results.

Was hoping to hear from anyone who’s dabbled with this...
 
Actually that stands a pretty good chance of increasing CO2 consumption. Depends on the particular valve but most valves will allow more travel than is necesssary for normal operation. By shortening the stem, it allows more hammer travel (stroke) and that in turn produces more hammer momentum. More hammer momentum means more valve dwell, thus more CO2 usage.

The thing I usually do with CO2 guns is add a bstaley O-ring buffer. I add O-rings (and spacers if necessary) until the velocity just begins to taper off. It's not uncommon to see a 50% increase in shot count for almost no velocity tradeoff. And it’s completely reversible if you don’t like the results.