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Thread: New Crosman 1377 are under power - here's how to fix them.

  1. #31
    Join Date
    Dec 2016
    Location
    leeds
    Posts
    2,061
    a good ftp set up with a 14.5 .22 barrel should do ten on ten pumps but you have to set hammer strike so the valve retains air to keep under limit

  2. #32
    Join Date
    Feb 2009
    Location
    Oxford
    Posts
    1,655
    That's some very healthy power for something that weighs nothing!

    Quote Originally Posted by --ped-- View Post
    a good ftp set up with a 14.5 .22 barrel should do ten on ten pumps but you have to set hammer strike so the valve retains air to keep under limit

  3. #33
    Join Date
    Dec 2014
    Location
    Leeds
    Posts
    34
    Hi I've had a 1377 and 1322 for years that are the old type with the hammer knob at the back the 1322 I've converted to air to run of my raped bottle when it got down to 1000psi with steel breach and scope and stock like rat catcher and the 1377 steel breach of a falcon fn19 flat top
    Piston stock scope and silencer then everything had to be bigger but as you know now bigger is not all was best and you have a limit on pistols the valves in them had spacers in or a loneg PTFE inlet valve taking up volume witch I took out then . but you have to much on standard barrels and the pellets gone time the rest of the air comes out . so know I've put a small spacer in to reduce volume so now with ftp 7 pumps 5.25 flb and you struggle to pump it more . there was one of these that had a different valve witch I sold way back but made the trigger much better it cocked when you pumped it and the valve split to release pressure has any one got one or seen one . any way I've found out now the pump has a mane part in the workings and I do not want to be pumping 20 + times I've a bull worker for that any way the first write up was good

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