The (new) Crosman Forum, your first and last stop for all things Crosman


120_2001r.jpg

Scot Laughlin's Custom All Weather 2260

2260 with short crosman receiver atop a mini riser made from aluminum tube. Barrel is a 2200 soda straw
tensioned inside a titanium golf club shaft. Three screw mod to the trigger, bulk co2, SSP 250 rear cocking
striker assembly. Factory stock, reshaped, bedliner finish and stick on cheek piece. The idea was a weather
resistant light hunter for rainy days.
I've got a Cothran stainless receiver and gas tube waiting for me to get back to this one.

 Return to Index  

Steve. As requested. Here are the piston parts for the testing.

March 10 2012 at 9:54 PM
Phil  (Login Duane30)
Crosman Forum Member
from IP address 74.140.196.166

Here is the piston unit for testing. Mind you, this is a crude way of getting things to work. Not particularly taking a fancy to shaking the gun each end every time to get the piston out. Tried string, but is was getting hung up in the moving parts:
[linked image]

This is the piston seal with the cavity shown. The cavity volume is right at .0007cu.in./.011cc:
[linked image]

The next picture is the valve, again. This particular valve, though the same valve, has been altered at the piston side. If you can see it, there is a pronounced taper to match that of the conical shape inside the piston seal. There is a shelf the same with of the thickness around the edge of the piston to allow sealing contact:
[linked image]

The idea of tapering the valve face was to minimize losses between the o-rig and seal. Then, a well had to be created in the piston seal to allow clearance for the exhaust stem to pop and to act as air storage space. In addition, the well creates a more pliable piston seal wall.



"The majority of things in our lives are created by folks no smarter than the rest. Afterall, the world is comprised, and operated by C average people intellctually, academically, and morally. These people are often the great pioneers that set the precedent for what excellence should be."

 
 Respond to this message   
Responses

Crosman Corporation 1-800-724-7486

This forum is not affiliated with the Crosman Corporation in any way// Information presented in this forum is intended for informational purposes only; use at your own risk//Posts made to this forum are solely the opinion of the individual member