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Putting a little more power in a $15.00 Daisy

Discussion in 'Air Guns' started by cobalt327, Jul 17, 2016.

  1. Mauser lover

    Mauser lover Member

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    I was thinking "those guns" would be the ones with fake engraving or fake special status AND those of us in this thread making high performance BB guns.

    I'm actually hoping someone will have the same idea with all those surplus Daisy/Avanti 853s. I'd like to get 600 FPS! I just don't know what to do about it!
     
  2. cobalt327

    cobalt327 Member

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    That something I had also wanted. A higher output single pumper based on the 853 should be doable for someone with the chops to pull it off. The basic gun is strong, I'm sure it could take a lot more than what barely 500 fps puts on it.
     
  3. Cvans

    Cvans Member

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    I've owned a number of those and don't think I've ever seen one that could push a light pellet to 500 fps. They are accurate but slow.
     
  4. cobalt327

    cobalt327 Member

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    I've had 2 of them and neither of mine ever broke 500 fps either. I got 478 avg. from 7.0 gr. Hobbys.

    ETA- the ES was good so the actual MV was okay for 10M target shooting. Thing was, I shoot at longer distances when I plink and that's 99% of my shooting.
     
    Last edited: Nov 8, 2019 at 9:56 AM
  5. Mauser lover

    Mauser lover Member

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    I'm going to have to chrony mine now... if I remember.
     
  6. Cvans

    Cvans Member

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    I tried using them to control English Sparrows in the Purple Martin houses. At long distances they were shooting too slow and the sparrows could move before the pellet reached them. Kind of disappointing. For basement plinking they worked good.
     
  7. Mauser lover

    Mauser lover Member

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    Just a quick note. I tested out my Daisy 853. I got 462, 461, 456, and 460 fps. I got bored and moved on to just shooting my steel swingy target instead of checking the chronograph.
    Anyone have any ideas on how to soup it up?
     
  8. Cvans

    Cvans Member

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    That's inline with what I remember. It's been quite awhile since having anything to do with them but it seems that one would have increase the air charge and the valve design.
     
  9. cobalt327

    cobalt327 Member

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    Not a modification, but the 853 I first got from CMP had a lot of slop in the pump lever pivots and linkages. I replaced it with a new one from Daisy (p/n 167939-000 Pump Lever Assembly, $11.00) and it increased the MV by 8-10 fps.The headspace can be maxed out to gain a bit. If a solid spring guide were made it would increase pressure by reducing volume inside the compression chamber. The transfer port is accessed by removing a plug in the bottom of the valve body. When the plug is removed a drill can be used to increase the size of the TP port, and the port where it enters the barrel can be slightly angled. All together still not going to be that much of an increase, though.

    TP PLUG.jpg
     
  10. Mauser lover

    Mauser lover Member

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    I guess a pneumatic gun is a pneumatic gun, so what's good for the springer in theory is going to be good for the 853 in theory. Application is going to be different, no mainspring to stiffen in the 853, but increasing the pressure is increasing the pressure. Increasing volume of airflow is increasing the volume of airflow.
     
  11. cobalt327

    cobalt327 Member

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    Very true in my opinion. Ideally the pump chamber swept volume would be increased to gain pressure but that is a pretty tall order for most hobbyists.

    I forgot to mention, and it might not hold true universally, but I got better MV using RWS Superpoint 8.2 gr pellets than when shooting many lighter pellets. So finding the pellets the gun likes can gain some performance.
     
  12. Mauser lover

    Mauser lover Member

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    I've got a lathe and a mill and am not uncomfortable boring out compression cylinders (or whatever you should call them) or even making new cylinders/pistons. I'd probably be better off starting from scratch and building a new design, but I don't think I'd find as much fun there.
     
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