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do the 2100 and 1377 share the same valve?

October 17 2011 at 3:09 PM
pete  (Login petedrans)
Crosman Forum Member
from IP address 67.253.19.131

 
If so, what gives the 2100 more velocity? just barrel length?

thanks

 
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Phil
(Login Duane30)
Crosman Forum Member
69.136.2.133

No. Velocity difference is due...

October 17 2011, 4:42 PM 

...overall pressure. The 2100 valve is smaller in volume and has a longer swept pump volume stroke for stroke than the 1377. The smaller valve volume with more air being pumped in means higer valve pressure. The higer pressure pushes the pellet faster.



"Well, I thought it was a rabbit but it turned out to be Bear Grylls in a rabbit hide."

[linked image]

 
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(Login Bruce46)
Crosman Forum Member
99.10.200.140

Re: No. Velocity difference is due...

October 17 2011, 5:45 PM 

Question, are the external dimensions of the 1377 and 2100 valves the same? (Outside diameter) Could a 2100 pump and tube be adapted to a 1377 to make a super 1377?

 
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Phil
(Login Duane30)
Crosman Forum Member
69.136.2.133

Sure...

October 17 2011, 7:43 PM 

...it can. The 2100 and 1377 valve diameter is the same along with models 760, 766, 2200, etc, etc.

Some work needs to be done to the rear of the 2100 tube, must use the 1377 valve and drill retaining hole lug in the tube (if planning to use the pistol frame), and shorten the piston (no worries, the shortened 2100 piston with 1377 valve still has a much longer stroke than the stock 1377).



"Well, I thought it was a rabbit but it turned out to be Bear Grylls in a rabbit hide."

[linked image]

 
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(Login Bruce46)
Crosman Forum Member
99.10.200.140

Re: Sure...

October 17 2011, 8:01 PM 

I'm planning to build a 1322/2289 carbine and when I was a comment that the 2100 valve puts out more pressure I began thinking. A modified 2100 pump tube would help balance the long barrel (18") plus adding more power sounds like a good idea. Is there something flawed with my thinnking? Thanks

 
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Phil
(Login Duane30)
Crosman Forum Member
69.136.2.133

No flaw in the thinking...

October 17 2011, 8:56 PM 

Just remember, if you should not use the 1377 valve in the 2100 tube, you will need to come up with a plan to mount the trigger frame forward screw location; with the 1377 valve, there is an anchor point where the screw threads in to allow the frame to be held on.

The dude over at AC Custom parts built one, I have built one, and few others on here build them. I went with a rifle version using the 2260 trigger pack and stock.

"Well, I thought it was a rabbit but it turned out to be Bear Grylls in a rabbit hide."

[linked image]

 
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(Login robnewyork)
Crosman Forum Member
108.21.102.194

phil, u still do p17 msp??

October 17 2011, 9:01 PM 

i know ur busy , but i was planning a p17 carbine in the future that i can hunt with

 
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(Login Duane30)
Crosman Forum Member
69.136.2.133

Well...

October 17 2011, 9:33 PM 

...I did the one to see if it was possible - it is. Got another gun sitting here for me to have another go at it - this one I plan to keep and not trade off. The longer barrel on it I had Darren do that.

More importantly than being busy, is that I really lack the 'proper' tools do do the mod quickly and efficiently.

If you need step by step how-to, you'd be capable of doing it I'm sure.

The shop out of the place where I work will be closing down for the season soon, so access to their tools will close too (even though I have a key) - until the end of Feb, 2012 or so.

"Well, I thought it was a rabbit but it turned out to be Bear Grylls in a rabbit hide."

[linked image]

 
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(Login robnewyork)
Crosman Forum Member
108.21.102.194

let me know

October 17 2011, 10:18 PM 

email murphyrobert9@yahoo.com I can do it , but no idea how to start the msp process. this will be a personal post-buildoff thing.

 
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