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Pro Sport “snap” On Firing

Discussion in 'Technical' started by Andy Simmons, Sep 7, 2019.

  1. Andy Simmons

    Andy Simmons Engaging Member

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    hi got a .177 Pro sport with tbt tophat/guide inside. Think the rest is all original.
    When I fire there’s no twang but a sharpe “snap” sound...is the best I can describe it as.
    Is there any way to make this more of a thud?
    Cheers
    Andy
     
  2. Gary Jones

    Gary Jones Keyboard Hero

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    Swop it for a .22

    Being serious, my first gun was a .177 hw97k that had a loud crack upon firing. And in comparison my friends. 22 stoegar was practically silent. Turns out (at least to the best of my understanding anyway) that .177 guns have that louder crack due to the sound of the faster pellet.

    I cant put my life on the accuracy of the statement but I do believe it.

    Atb Gary
     
    Reevo17 likes this.
  3. TORNADOS7

    TORNADOS7 Pro Poster

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    Yep, they do that, as do the TX's... ;)

    Ps, much depends on the pellet yer using...
     
    Reevo17 likes this.
  4. Andy Simmons

    Andy Simmons Engaging Member

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    Using these...
     

    Attached Files:

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  5. Andy Simmons

    Andy Simmons Engaging Member

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    Do you think changing the piston seal would make much of a difference?
     
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  6. TORNADOS7

    TORNADOS7 Pro Poster

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    No buddy, it's down to the plenum chamber not having quite enough volume to contain all of the escaping air...

    The TXHC has a plenum insert which is a kind of baffle and they still make that snapping sound your hearing...

    It's a form of moderator in the true sense of the word wherein it mutes the crack rather than stifles it completely like a proper silencer does, you just gotta live with it...
     
  7. Andy Simmons

    Andy Simmons Engaging Member

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    Fair enough, well all things considered...I can live with that :)
    Thanks
     
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  8. Tyler durdon

    Tyler durdon Posting Addict

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    Are you getting piston slap ?
     
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  9. Andy Simmons

    Andy Simmons Engaging Member

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  10. john79

    john79 Keyboard Hero

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    Worn rear piston bearings describe your issues , ive had the same and replacing the rear bearing aswell as the piston seal for a v-mach seal cured the metallic slap noise and now a dull thud
     
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  11. Tyler durdon

    Tyler durdon Posting Addict

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    Have a look on inter web mate difference between piston bounce and slap . Will explain better than I can . I did experience this when playing with my 80
     
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  12. Andy Simmons

    Andy Simmons Engaging Member

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    Ah right, I’ll look into this then.
    Also when you replaced the seal did you size the seal at all or just fit it as is?
    I’ve read somewhere a while back that some size the edge down slightly as it could be a bit too tight? Can’t remember now, was just something I looked at briefly and thought...not doing that.
    Not sure if I’d want to try incase I do it too much or uneven and grease gets the other side of the seal.
     
  13. john79

    john79 Keyboard Hero

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    Some people size there seals as at first there tight and sap power , I tend to just shoot it until it beds it's self in prob requires 2 tins of pellets then there fine , this is just my own findings and some will say the v-mach seal will req sizing from the off.
     
  14. Andy Simmons

    Andy Simmons Engaging Member

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    Found this, does it sound about right...
    “Piston Bounce: this is when a heavier pellet is used, the pressure in front of the piston on the pellet is greater than the strength of the spring pushing the piston. The bounce is then created pushing the piston back up the compression tube further than it would normally do....with very little movement of the pellet. When the spring over comes the pressure ( which is greater than usual) on the piston it starts its longer journey back only to be met with still great pressure from the heavy pellet. This is what buckles springs and can blow seals.

    Piston slap: same as above but a very light pellet is used. The piston does not have adequate enough presure provided by the light pellet to slow it down. The spring overcomes any pressure and bottoms out the piston. Giving you the slap.”
     
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  15. john79

    john79 Keyboard Hero

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    try some tighter pellets like h@n /Webley accu pells /Crossman etc
     
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  16. Andy Simmons

    Andy Simmons Engaging Member

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    @john79
    I’d rather do what you’ve done and let it wear its self in than size it myself.
    At a guess after x amount of pellets the action would perfectly size the seal to the power/dimensions of the action maybe?
     
    john79 likes this.
  17. Andy Simmons

    Andy Simmons Engaging Member

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    I put some h&n pellets through it and still had the same noise.
     
    john79 likes this.
  18. Andy Simmons

    Andy Simmons Engaging Member

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    To be fair the jsb exacts I’m using aren’t a push fit, they go in a tad loose so this might not be helping the issue.
     
    john79 likes this.
  19. Andy Simmons

    Andy Simmons Engaging Member

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    Obviously not like throwing a sausage down a hallway loose but..you know what I mean.
     
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  20. john79

    john79 Keyboard Hero

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    yep , it will size it's self but will take afew tins maybe , you might be lucky like iwas with the last one it worked great after a tin
     

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