FIRE Pistons By Docfire PB

[docfire]

Mass Flow Rate of inside dia of piston only. FIRE piston vs stock piston. This take into account Choked Flow also. output is 14.7 psi and input is 300-800 psi at two temp 60f & 90f. This is all done with ChatGPT https://chatgpt.com/share/67d6e27b-0...d-cdbf1aa6c75b .

[docfire]

If Evel Knievel saw this ramp he would pick the FIRE Ramp......LOL

[Psycho91]

Might have to pick one of these up for my build, might as well right

[docfire]

the real question is......would Evel Knievel do it......

[latches109]

Mass Flow Rate of inside dia of piston only. FIRE piston vs stock piston. This take into account Choked Flow also. output is 14.7 psi and input is 300-800 psi at two temp 60f & 90f. This is all done with ChatGPT https://chatgpt.com/share/67d6e27b-0...d-cdbf1aa6c75b .

your prompt did not describe the system accurately, I am happy to help you. The unfortunate thing with AGI is the output is a function of input, and if not formed correctly, the basic AGI models make many assumptions. such as, mass flow would not be a common way to understand the flow rate in this use case - SCFM would be a more meaningful metric since temperature and density matter. This graph is overstating the actual flow by 5X. You doubled the piston diameter so, that quadruples the flow, and cuts the response time in half. But the main problem is your solution ignores the flow INTO the regulator which is half the diameter of your new piston. This also needs to be doubled if you do not want to run 800psi+, most tanks sold are 500psi. Lecturing me on this subject, is akin me telling you how to do a fire inspection. But don't take my word for it, science-ing is more fun than paperwork, go drill an extra inlet hole and check for yourself.

flyweightnate linear flow does not exist in a paintball marker, model it, fi you figure it out, that just might be the holy grail paintball marker. calculating Reynold's number for a slice of the system is not going to give you anything meaningful. " it impacts the pressure profile of the chamber DURING the shot." so we have two pressure waves one from the tank regulator and one from the HPR to make The Perfect Storm.

[flyweightnate]

Yep, totally believe you - no laminarity at these pressures. Just had to check.

I started up a spreadsheet for flow, but haven't finished it and I'm on the road this week. But there's a misconception...SCFM is, in fact, a mass flow, because a SCF is a volume given at a pressure, therefore, is a mass.

The behavior in trying to study is what happens at an input pressure less than twice the output, when it shifts from choked to responding to downstream values. With the popularity of LP tank regs, an input of 400psi and an output of 210 gets interesting.

It's tougher doing all this work without the company resources from when I used to do air flow stuff, but still worth doing. I'll try to post something later with an assumed Cd based on the orifice testing I used to do.

[flyweightnate]

Oh, and re: the inlet to the reg/ seat...

On the Ergo, BM/Karni, and Inception regs, is it just the one hole in the brass seat carrier? Or is there more room to get air to the seat on the externally adjustable regs? It's been a while since I cracked one open.

[docfire]

I encourage the debate as this helps learning, and leads to more testing. I agree laminar flow in a paintball marker is a fun one to achieve. Hell improving lam flow in almost any fluid moving system a challenge. But the end goal in the paintball marker is IMO is to launch a .68 cal ball weighing 3.45g down a 14 tube to 300 fps with the most energy efficiency. I believe the key thing to paintball markers function is the relationship between each component. This relationship can be disrupted or harmonized with each componed change. My FIRE Piston may or may not preform better than others, just like a ID valve may not work well with ST springs of vice versa. but this is the fun IMO build a combo that works different than stock

When it comers to paintball IMO you have different classed of players. The players that keep it stock, the "Bedazzler" fancy ano and color ways, the resto-mod "its all about what's under the hood" , and the Full Custom tweakers (MBC members). I feel my piston fits the last two. Is it right for your setup maybe, maybe not, but it dose work.

Now its easy to throw rocks in a glass house. Trust me i have done it. And the "forms" are the birth place of that LOL.

Keep your barrel clean and your paint round

Garrett Simmons
Docfire PB owner