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Havent' done all the "tricks".

May 9 2013 at 5:28 PM
robert  (Login gubb33ps)

Response to HPA Crosman Conversions Max Achievable Power ?

But did max out a 2260 HiPac conversion with the standard Crosman valve and a prototype high power valve. Normally will set it in the sedate 15-16 foot pound area and hunt tree squirrels with it, but when I got the new valve, had to see what it could do.


[img width=600 height=219][linked image][/img]

Other than the stock and 2240 trigger unit, it's pretty much a steeel breech 2260.

MAX TEST (max effort):

Substituted the "red" spring. Had to grind off one coil to get the gun to cock at all and the effort in cocking it is excessive.
Upper sweet spot pressure = 185BAR

Issue Crosman valve (just the piercing pin removed):
14.3gr. = 819 - 789fps = 12 shots = 20.5 foot pounds per shot
21gr. = 729 - 699fps = 13 shots = 23.8 foot pounds per shot

New Valve:
14.3g. = 926 - 896fps = 10 shots = 26.4 foot pounds per shot
21gr. = 810 - 780fps = 11 shots = 29.5 foot pounds per shot

Am sure more energy could be gotten (at fewer shots per fill), but it's kind of already pushing things.

This message has been edited by gubb33ps on May 9, 2013 5:31 PM

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