What causes different levels of efficiency across different nelson valve guns? Let's take for example the jt er2 vs the phantom. They use essentially the same valve design, what makes the phantom so much more efficient than the er2? Is it just that lots of gas is lost in the clam shell design of the er2 or is it the tighter tolerances of the phantom? Thanks!
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Gas, Grass or Brass, no one rides for free... -
I reckon that barrel length has an impact. Takes more energy to get a ball up to 300 fps in a 5" barrel than it does in an 11" barrel and so on. Clam shell likely doesn't help.💀 PK x Ragnastock 💀 -
That's surprisingly high. What velocity-ish?Originally posted by MrKittyCatMeowFace View PostMy brass eagle tigershark gets over 40 shots on a valken brand 12gram. Really good right?
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Barrel length / paint to bore match, environmental temperatures, velocity, spring setup, and how fast follow up shots are taken all play into the massive swing in efficiency numbers.
Over the chrono numbers are always higher then real world playing numbers because it’s comes down to player style. The slower more methodical you play the deeper into a 12g you can shoot.Comment
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no clue. a chrono is one of my next investments. ive passed on great deals all the time and ive always regretted it.Originally posted by Jonnydread View Post
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I want to design and make a brass body kit using er2 internals. Was curious what changes I could make in the process to help with efficiency, but seems like my plans would already help, full length barrel and tubular phantom style body.Originally posted by Chuck E Ducky View PostGas, Grass or Brass, no one rides for free...Comment
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I would say spring setup is most likely the most important. You want enough dwell of an open valve to get maximum acceleration out of the ball before the ball travels too far down the barrel. THere is a point in the balls travel where the valve being open is not adding energy to the ball just filling volume of the chamber and barrel behind the ball. This is where venting of the barrel comes into play. If you have an under bored barrel you start drawing a vacuum behind the ball retarding its travel. Thankfully paintball guns are not a hermetic system but there is an opportunity for this to be an issue.
"When you are asked if you can do a job, tell 'em, 'Certainly I can!' Then get busy and find out how to do it." - Theodore Roosevelt
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Breach oring is important to. Dose the ER2 have a breach oring? Better bolt to barrel seal= Less blowback and more shots. Lots of people overlook that on the Phantom a good seal helps lower the amount of gas needed to hit field speed. It Makes them softer on paint to and you can pick up a decent amount of efficiency because it effects each shot.
For instance the Hammer 7 bolt design allows for massive blow back and has one of the worst Nelson valve efficiency. Just filling the bolt flat spot on the bolt with JB weld gives you a good 10 shot boost. It’s difficult to get a good seal on the breach due to its mag fed design that’s why it’s efficiency numbers suffer. (Among other things)Last edited by Chuck E Ducky; 02-08-2021, 02:04 PM.Comment
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I bought a beat up SL68i that came, oddly, without a bolt. I hacked down a Stingray bolt and threw an o-ring around it as a bumper between bolt and barrel. Velocities even on HPA were really high last time I tested - 270-290.
I didn't do it to improve efficiency, but now that you mention it, I bet it helps. -
Oh yeah. I know fitting that oring to the barrel on a phantom makes a big difference especially if you got an an old worn out one on there currently. Good clean seal is key to a very consistent and efficient Phantom.
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