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What does short stroking achieve

Discussion in 'Anything Airgun Related' started by valboskie, Mar 21, 2014.

  1. valboskie

    valboskie Busy Member

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    Can anyone explain the benefits of short stroking a tx200 mk3.
    I have been following Jim tylers articles in airgun world in his experiments short stroking
    His hw77 it felt nicer to shoot but lost accuracy.
    Then there is transfer port sizes he experimented with various sizes and lengths
    I thought it was something I would do to mine but I'm not sure now if the accuracy Suffers
    That's the most important thing to me.

    Has anyone got a short stroked tx200.
    Does it shoot better with a faster shot cycle
    Is it less hold sensitive
    Has the accuracy got poorer since the short stroke.
    Is it less pellet fussy
    Is it worth doing if so what's better replacing the piston rod or adding a piston extension
    Did you alter the transfer port sizes

    Cheers
    David
     
  2. mattyts

    mattyts Donator

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    Lock time should be faster as the piston has less distance to travel so shot cycle will be quicker.
     
  3. The Robin

    The Robin Super Moderator Staff Member Mod/Admin

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    Matty is bang on the money :up:

    There are some great springer tuners on here which will add far more info and tech spec than me
     
  4. Jed Clampit

    Jed Clampit Posting Addict

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    The 98 I shoot is one of Jim's It's been short stroked.
    Matty is correct. But....
    As far as I can figure ease of accuracy , so hold sensitivity is changed not nessesarily made better or worse.
    When you pull the trigger on a springer, because of the movement of the internals, the tip of the barrel starts moving in a circle, more of an eclipse really. If the pellet exits the barrel as it's moving either up or down the gun will be more difficult to shoot accurately because the barrel is relatively speaking moving at speed. So if you can tune the gun so the pellet leaves the barrel at the top of the ellipse, as the muzzle is changing direction, the barrel is moving at its slowest so upsets the trajectory of the pellet least therefore making the gun no more accurate, bur more easily shot consitantly.

    unfotunatly that's the extent of my knowledge - just what I've picked up from Jim.
     
  5. Tinbum

    Tinbum Delusions of adequacy

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    If you mean the movement created by torque release of the spring, a top hat and slip washer will reduce it.
    If its barrel harmonics, then it happens in all guns and is not due to the internals. Lots of research has gone into "tuning" barrels, shortening or adding barrel weights etc. but I'd certainly leave that until the rest is sorted.

    Shortening the stroke reduces the volume of the cylinder, that means you can have a more powerful spring action which will be running closer to its peak efficiency. Lock time will be dramatically reduced, in turn reducing hold sensitivity.
     
  6. Jed Clampit

    Jed Clampit Posting Addict

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    from what I understand the acceleration & movement of the piston forward will cause the muzzle to dip for a fraction of time, to do with transfer of weight and energy. This is the start of the movement I referred to.
    Barrel harmonics are part of that I guess, but not the cause of what I'm trying to describe.
    But now on the edge of my knowledge so time to back out of this one I'm afraid.
     
  7. Akita177

    Akita177 The Absolute State of Britian podcast

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    With the TX200 MK3/HC you have to also remember the stroke length is way to long because of the american market and there higher power versions.
    So in standard form in 12ft/lb they do feel soft in recoil but the shot cycle is very lazy/slow so for hunting/hft/FT it does make them harder to shoot.
     
  8. valboskie

    valboskie Busy Member

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    So in that case if I buy say a 10mm nose extension put my vortek original ring on it rebuild it I'm good to go
    My tx is now short stroked.
    Or is there a lot more to this that needs working out.
    Cheers
    David
     
  9. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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  10. mark.177

    mark.177 Donator

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    really interesting question.... hadnt evwn considered this wirh my 95 but now I have the worm in my head.... I didnt think to measure the stroke length of my 95?
     
  11. audiguypaul

    audiguypaul Donator

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    There is much more to it than a piston nose extension. Wonkey Donkey short stroked my mk3 and the difference is like night and day, much much nicer to shoot, not so hold fussy. mine has had a longer latch rod fitted rather than a nose extension, TP sleeved, different spring etc etc etc, if is was as easy as sticking a nose extension on we'd all be doing it rather than paying someone who knows what they're doing ;)
     
  12. Akita177

    Akita177 The Absolute State of Britian podcast

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    "So in that case if I buy say a 10mm nose extension put my vortek original ring on it rebuild it I'm good to go"

    I went to UK neils and watched him make my 14mm nose extension all the other internals where standard and left the same also using the standard AA seal, it was doing 11.6ft/lb before and with the extension it was also around 11.6ft/lb in my Full length MK3 and didnt require any other tuning/adjustment.
    Though nothings set in stone when it comes to springers, im unsure of the 14mm spacer in the Hunter Carbine but i need another days testing.
     
  13. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    You might find this of interest ;)
     

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