Walther look see

Discussion in 'Piston & Spring' started by hmangphilly, Mar 27, 2018.

  1. hmangphilly

    hmangphilly Floppy Quick Phil

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    Could any one let me know the std piston weight please

    Got a 25 mm idea
    Ta

    And if you know the standard breach o ring size that would be handy too
     
    Last edited: Jun 18, 2018
  2. Nick G

    Nick G Active Member

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    BS 108 rings a bell for the breech seals , piston without rod , mk 3 piston with rod & seal 218 grm, you may have been reading my mail , I recently dug out an old ally 25mm o ring short stroke piston set up, and built my spare gun with it, its incredibly fast , and a little loud , and the cocking is about the same as a mk2 , but the sight picture hardly moves and its really easy to shoot accurately.
     
  3. hmangphilly

    hmangphilly Floppy Quick Phil

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    Thanks nick

    Just wanted to make an alternative in 25 mm
    We've got a Std comp tube so why not .

    I had most of a std piston too so I've put a ti O ring nose on it.
    It s 233g at the moment so not too far away .

    It's the solid nose that adds the weight .

    Should be able to shave a few g off and see how it feels .

    Goes up and down quite nicely

    Currently got 3 or 4 working tunes for the owner to try out .

    He's gonna be busy
     
  4. banditrob12

    banditrob12 Member

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    I have got a standard LGU piston here with rod bearings and seal. I can weigh it accurately at work tomorrow if you need it.

    My calipers aren’t working to measure you an o ring if you PM me your address I will send you one if you need it I’ve got some original ones.
     
  5. hmangphilly

    hmangphilly Floppy Quick Phil

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    Thanks Mr Bandit .

    That would be mega .
    The shame is , i had a couple of these new .
    Didn't think i'd need them and got careless where i put 'em .

    My favourite saying is ...." now where have I put ..................":mad:
     
  6. hmangphilly

    hmangphilly Floppy Quick Phil

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    Are we talking lgu here Nick ?

    That's what I'm after



    OH

    while i'm at it ......

    where are we on std lgu transfer ports ? 3.0 ..? 3.2? I've heard of them up at 4 's .........come to think of it , wasn't this one up round there ?
     
    Last edited: Jun 19, 2018
  7. Aaronbradshaw

    Aaronbradshaw New Member

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    Just weighed my spare standard lgu piston, 250g with seal :)
     
  8. hmangphilly

    hmangphilly Floppy Quick Phil

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    Awesome thanks for that

    I'll leave this alone then
    It's making all the power this is with a plastic top hat and sleeve

    STD spring .Std to .small spacer .

    right up there on the chrony

    image.jpg image.jpg

    Here's a 21 with home made comp tube

    image.jpg
    image.jpg
     
    Last edited: Jun 19, 2018
  9. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    I'm pretty sure that the standard port size is 2.7mm or thereabouts and most people bore them out to 3.2mm to stop piston bounce.
    Don't quote me on that though...;)
     
  10. hmangphilly

    hmangphilly Floppy Quick Phil

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    Thanks Colin

    I can get the shank of a 2.6 drill into this one

    It does feel a bit surgy I'll leave it be

    Easy for the owner to pop a 3 mm drill through there.
     
  11. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    If it's .22 just go the whole hog with 4mm and be done with it, certainly won't get piston bounce then.
    I'm sure I read somewhere that Brian was experimenting with putting in a venturi screw into the port on his springer so he can fine-tune...:D
     
  12. hmangphilly

    hmangphilly Floppy Quick Phil

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    Top
    21 x2

    Mid. 22 x2

    Lower
    25mm

    IMG_3248.JPG
     
    Aaronbradshaw likes this.
  13. RobF

    RobF Administrator Staff Member

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    Which one did I shoot today? Felt nice.
     
  14. hmangphilly

    hmangphilly Floppy Quick Phil

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    The one at the top

    21mm . ti head and skirt

    91mm ? stroke .......i'll measure that again to be sure
     
  15. hmangphilly

    hmangphilly Floppy Quick Phil

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    He was shooting it again yesterday .
    Final shake down before it goes back home .

    30 degree ambient temp .
    we left the gun in the sun for a while and got it up to low 40's

    exacts were 777 from the tin , with one or 2 going high .
    Sizing them dropped fps to 767 but stopped the high one creeping in .

    This gun has been a bit of a development donkey , and we have learned a lot .
    The poor old thing has picked up a few marks through the development work.
    We have a plan to rectify that , but probably sensible to let the owner settle on a tune first .

    I contacted Paul Chell through AGF uk . regarding refinishing the metal work . He came back promptly and his estimate seemed very reasonable.
    His work is well spoken of over on AGF uk.

    First things first , lets make sure she shoots straight .

    Rob seemed quite happy with it ............said it was easy to shoot .
    Even I hit a target ................once or twice
     
  16. RobF

    RobF Administrator Staff Member

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    92647ABE-08BD-40EC-B9EE-42EF37CF1B57.jpeg

    Got almost bored sticking these into the group at 30 yards sitting... about 20 sized shots exacts in there.

    Was actually really pleasurable to shoot, felt like plinking. I was pinging the knot on a plumbline at 30 as well, just having fun, didn’t feel like work.
     
  17. hmangphilly

    hmangphilly Floppy Quick Phil

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    Rifle back home now .

    some early feed back coming in .

    looking promising .................


    I have no details yet , of range or pellets or fps or which of the tunes was fitted ............

    lgu group.jpg
     
    RobF likes this.
  18. Sundance

    Sundance Bush Cavity

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    Very happy so far Phil, had a couple of tins through this tune now.

    It's the 21mm skirted I believe, it's the one that was in it when sent back, not had it apart yet..

    Cocks smoothly and easily, nice gentle shot cycle, can see pellet in flight at lower mags, consistent over the chrono and seems robust...absolutely no issues so far, really happy with the way its shooting....

    This was with 7.9's running at about 780 fps with the lighter top hat. The group was 10 shots at 50 M . Over the chrono I'm getting about 10 - 15 fps spread but that gets better with sized pellets.
     
    Last edited: Jul 14, 2018
  19. Sundance

    Sundance Bush Cavity

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    Out of tin, sized 7.9 JSB

    781 781 777 775 779 778 780 782 782

    7 fps spread
     
  20. hmangphilly

    hmangphilly Floppy Quick Phil

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    Any temp issues Simon ?
     

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