Question about A4 Pressures....

[dirthead]

My question is.....How much pressure actually flows through the bolt and contacts the paintball? For instance, my settings are:

Large volumizer
PSI into minireg - 450
PSI out of minireg - 200
Dwell 16
LPR - 55

What psi hits the paintball? Is it 200, or something less??

[SquirtGun]

I figure it should be around 55psi, as the lpr set the pressure "behind" the exhaust valve.

I just talked to my angel tech here in vienna and he told me (opposing to what everyone else is saying here), not to reduce my lpr pressure to 55psi, as this will only make the a4 less gas-efficient. He also said, that a dwell time of 16 or 17 is crazy...

Finally I am totally confused! ;-)

Nick

[Sparco]

Of course you're going to lose efficiency with the low LPR/high dwell. You're creating a much larger volume of air behind the ball and expending more "psi" per shot. But with the increase in air volume you're reducing the kick of the marker and creating a bigger cushion of air behind the ball, which translates into reduced paint breakage.

Not to mention the decreased efficiency is not brutal, I'm getting 8 pods and a hopper off a 4500psi fill with Dirthead's settings (1,300 shots) with approximately 1000-1200psi in the bottle.

[SquirtGun]

Hmmm... well, probably worth a try...

Looks like not all angel techs have the same opinion on this matter! ;-)

[Emmit]

what I got out of talking to Ken one night and questioning the LPR and it's operation etc for about an hour was the that LPR is responsible for reducing the air pressure from the markers input pressure to something less to allow for the operation of the ram. If the minireg is putting out 200psi that's what's passing through the exhaust valve, the 55psi is the pressure the LPR is using to operate the Ram through it's cycle.

[SquirtGun]

Well, well, well. That means, lowering the lpr pressure would affect the speed at which the ram travels, resulting in less kick. But what confuses me is, that this would mean, that a change in lpr pressure does NOT change the pressure at which the air hits the ball. This again would mean, that you wouldn´t have to make adjustments to the dwell time, if you only change the lpr setting.

Changing the volu would then be the only reason to adjust dwell time, as the larger volus decrease the operation pressure of the 4.

Oh god, this is rocket science...

;-) Nick

[Emmit]

the dwell is still necessary as you still need a larger volume of air to operate at the lower pressures. Remember the dwell is the electronic control of how long the valve stays open when the hammer hits it. by reducing the LPR pressure you're able to lower the operating pressure of the marker as you don't have as much force hitting the valve so you need more air to pass through the valve which means it has to stay open longer.

[SquirtGun]

Okay, know i got it. So it´s similar to the way blowback systems work. The harder the hammer hit´s the valve, the more air passes through it.

I thought this was different with the angel. I figured the valve has only got 2 positions: open or closed. But obviously this is not the case!

I will try to get my hands on an lpr tool and set the pressure to 55psi tomorrow night at our training session.

Actually i found a video on the wdp page, where they use the exact same settings that u mentioned. I like the fact, that their using 400psi output pressure, cause this is very close to my setup. ;-)

Nick