Paintball regulator and plenum sizing

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Dr. Kralenstein

Dr. Kralenstein

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Apr 14, 2022
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The Laboratory, United States
So I'm making a drop block build and was wondering if the little paintball regulators for the bottle has any plenum area?

Trying to see how much plenum I have with this setup. Wanting to get 20 fpe max.

14.5" 22 barrel
Reg set at 1500 psi
250cc bottle
250 bar fill

This is what I'm working with. Has maybe 1/4" passages about 4" total length. Screws directly into valve.
20221215_204411.jpg
 
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For me, I've always had a love hate relationship with bottle builds. I love how they look and the shot count, but you have to be careful not to put the bottle too far out. Here's a .177 Prod conversion with a custom length tube. There's about 1/4" between block and valve, and the tank block is drilled out as much as I could. I was only able to get to 11 fpe with a reg pressure of 1300 psi.

Czk5N9f.jpg
 
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Joedirt199 said:
I think those blocks are just drilled passages and not milled out actual space. Not much volume. Would be nice if you had more air tube space before valve.
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That's what I was thinking. I had him cut one down to make it as short as possible and didn't think about the lost volume. I do like how it just threads into the valve.
 
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SteveV said:
What's left of your tube in front of the valve IS the plenum. The most I can get with this set up is 17+ fpe. The reg is a 1500 psi output, using a P-Rod hammer spring, with a ported Discovery valve, 14.5", 2250 barrel.

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I have a feeling my 20 fpe goal will end up at 10 fpe lol. There is just no plenum space with this design. The short tube section that goes from the block to the valve threads into the block also, so I may be able to remove that and bore it out some but I'll se what it starts with.
The project is meant to be a plinker but would like power to hunt. Oh well, I can grab another gun for that if necessary.
 
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SteveV said:
or you could use a 2250 or 2400 tube with what you have?

This is a 19.5" barrel, Cothran 2250 pcp tube - no issues with power!
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Always liked your rifle, didn't know who it was just seen it on the googler. I have a 2260 pcp in a 160 stock already, this current build is going to be a carbine plinker/light hunter. I'm making a stock for it that gives me a pistol style grip but using the Mrod rifle trigger. Those triggers are sweet. Modeling the stock to look similar to a brocock bantam sniper, that semi pup look kind of like your guns butt stock area.

Possibly switch to 177 if I can't get the fps high enough for 22. I'd be fine with 750 with 14.3s.

Just wanted something different to play with for the winter.
 
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