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Paintball to .22 pellet conversion.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote J-S Quote  Post ReplyReply Direct Link To This Post Posted: 24 Feb 2020 at 12:01pm
Update.. nothing on this one..
BUT, i did get a couple more cheap paintball guns of Trademe to hatch some more evil plans. Both are electric triggers which a very light compared to the current mechanical.

Current project has a long bolt insert which acts as a transfer port of around 70mm. Is this wasted space for gas expansion, or does it aid in power?

The next project may be a pistol version; if I make the barrel transfer port directly over the valve (like a crosman 2250), should this provide better use of the gas?
(Im a springer fan at heart so this gas stuff is a bit less known).

Below is a quick preview idea of project number 2:


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Post Options Post Options   Thanks (0) Thanks(0)   Quote J-S Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2020 at 2:25pm
Originally posted by dvlnme dvlnme wrote:

if using lot gas and not getting better performance,you may need to open up valve and free flow it a little to let gas flow faster thru valve,otherwise maybe still letting gas flow thru valve after pellet has left barrel,ideally gas should be just enuf to expand enuf to fill barrel up to time pellets about to exit barrel.any more gas is just wasting gas,really all about timing,co2 is thicker and heavier than hpa and runs some where in the 900psi range,more co2 dosnt necessarly mean more power,bassiaclly once co2 has expanded to fill barrel behind projectile it wont produce any more power,and just vent any remaining gas to no effect once projectile has left barrel,as co2 relys on expansion under pressure to expell the projectile,once it has no where to continue to expand,it cant continue to produce pressure behind the projectile,so is just vented and wasted bassically,bit long winded explaination but essentually how co2 works.
 cheers mike

Cheers! Nicely explained indeed. 
I think another issue with the test is that the paintball bolt is a 14mm cavity, so i guess once the valve shuts the gas is expanding in there as well as down the barrel?? 

Plan is the probe insert which will act as a narrow transfer port on 3-4mm, blasting directly behind the pellet... parts request is in the queue for lathe time with a certain tuner.

Once complete I can play with increasing valve volume, more springs etc etc.. 

Another update, I just picked up another cheap paintball marker for future project; this one has an electronic trigger that is super light compared to the current mechanical job.. 
J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shaqa Quote  Post ReplyReply Direct Link To This Post Posted: 11 Feb 2020 at 6:16pm
Nicely explained
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 11 Feb 2020 at 4:56pm
if using lot gas and not getting better performance,you may need to open up valve and free flow it a little to let gas flow faster thru valve,otherwise maybe still letting gas flow thru valve after pellet has left barrel,ideally gas should be just enuf to expand enuf to fill barrel up to time pellets about to exit barrel.any more gas is just wasting gas,really all about timing,co2 is thicker and heavier than hpa and runs some where in the 900psi range,more co2 dosnt necessarly mean more power,bassiaclly once co2 has expanded to fill barrel behind projectile it wont produce any more power,and just vent any remaining gas to no effect once projectile has left barrel,as co2 relys on expansion under pressure to expell the projectile,once it has no where to continue to expand,it cant continue to produce pressure behind the projectile,so is just vented and wasted bassically,bit long winded explaination but essentually how co2 works.
 cheers mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote J-S Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2020 at 10:43am
Update: I trialled shooting loading a pellet into the barrel, then orings on the breech end of the barrel securing into the paintball bolt. This gave me a huge 1.8fpe!! and 180-230fps

So i did a trial with spring replacements based on assumption the valve is not being opened fully.
1) the short firm spring was replaced with a long firm spring - no free flight and minimal pre-load to try and avoid bounce
2) Conical soft valve pin spring was replace with a bodge job made from the firm spring - idea is the strong hammer spring opens it up fully, and a strong valve pin spring returns closed and resists bounce. 

It worked! not fully where i want it but it is now 7.8fpe, and much louder so a good amount of gas used.
The valve pin spring bent the last couple of coils where it was heated and widened to fit the seat to keep it centre - I have ordered more springs  (to try in a month when they arrive in a month from AliExpress) and will make a spring guide of sorts, to keep the spring seated centre without needing to be conical shape.


(Silver Springs are the standard paintball jobbies)

J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

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Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jan 2020 at 8:51am
if you dig around on utube you will find all sorts paintball to pellet conversions,paintball valve should put out plenty power for what you doing,and can be easily modified if needed,not that hard to make a new valve either,plenty to keep you out the pub for a while eh!lol.
 cheers mike
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote J-S Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan 2020 at 4:47pm
Originally posted by dvlnme dvlnme wrote:

that little project will keep you busy mate,good bit fun,
 cheers mike


Yeah its a bit of fun. problem is I have to get it all functioning good to go, before I can see if it has enough power to be useful!
J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

Current projects:
Too many..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan 2020 at 5:32am
that little project will keep you busy mate,good bit fun,
 cheers mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pauly5 Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jan 2020 at 1:27pm
That's a good enjoyable read thanks. Will await the progress.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote J-S Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jan 2020 at 12:05pm
Also adding updated pics and videos to Instagram #paintballtopellet for anyone on the 'gram.. 
J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

Current projects:
Too many..
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