operating pressure

[Sam12523]

waht is the sentinel's operating pressure

[sponge008]

600 psi I think.

[ingenexec]

optimum about 500-550 for the original pins, closer to 750 (i think) for the new co2 style pin, and mine runs at about 380 or so with the LP kit.

[akaAssasyn]

i've been reading the treads on the LP MOD. Everything i have is stock, and my senti can't re-cock at anything below 550. The velocity adjustor is out. I've oiled pin guide. I even filed pin so that more air goes to the hammer (thats why i can drop the pressure to 550). the only thing i can think of is new springs, mine seem very tight.

before i do that does anyone have anyother ideas?

[ingenexec]

First, post your serial number. If you've got the newer co2 pin you wont be able to reg down very far, I suggest either getting an LP mod or the older pin to lower your pressure further. Mine would recock (provided i had really tight paint to bore match) at about 300 psi (little velocity to that...) and not very fast, but it did it. Just get a new pin (or an old pin, heh)

[akaAssasyn]

my serial is 2388, i have the new pin and i did put in the lp pin in


i just read my orginal i have the lp pin and it can't function below then 550 psi. forgot to mention it. i was kinda pissed that i got the pin and practically did nothing.

[ingenexec]

Ok, take out the nylon spring guide that goes in the valve spring and down into the velocity adjuster front dealymabobbur. Make sure the O ring there is OK, sometimes it can get a vaccum behind it and not want to adjust no matter how far out you move the screw. Just get that to vent, wipe about 2/3 of the oil off (its already sealed further up anyway) and try again.

[akaAssasyn]

yeah i tried that, i read it in one of the posts. i think you wrote it actually. thanks for the ideas. i still need help though

to bad now. out of air. i'll try later

[ingenexec]

http://www.hunt101.com/img/151933.jpg Thats how mine looks, if yours is different, then you fail! JK, just make sure everything's the same, cuz I can't think of a lot to do about this. Hmm... What kind of reg are you using? Can you just post a pic of your gun? and are you sure the gauge is accurate?

[AM_Andy]

Give calling Ernest a call to see if he can help you out. 9 out of 10 times, he'll be able to help you out over the phone! The number is in my signature.

[akaAssasyn]

Right now I have the torpedo that came with the senti. I'm picking up a CP reg soon. So I'll try with that reg. I have no idea how to tell if the guage is wrong.

My LP set up is similiar to yours ingenexec. Only thing different is color of the seal and the oring on mine is around the bottom ring.

Well thanks for the help. I'll see what happens with the new reg. If not I call someone at AM. I also ordered some springs just in case its the drive spring.

I did think of something with the spring on the nylon stopper. With the delrin pin guide, the spring has more tension. So that there is a shorter dwell. But I'll make sure the springs are my last resort.

Thanks

[ingenexec]

Well try moving it to the top, take out your velocity adjustment screw, and put the adjuster stoper back in and THEN screw in the screw. BTW, how long is your adjustment screw? I had that same kind of problem because the screw in mine was too long. Ernest hooked me up with another though, for free even :) AM rocks.

[AM_Andy]

Yeah, we're not so terrible, no matter what my mom says about us.

[ingenexec]

Your mom obviously bought an impulse before she heard about diadems... sounds resentful :P BTW, you guys got a release date for the diadems con vision? Pleeeeeease? I'm begging here... dont make me call, you know I talk forever :devil:

[akaAssasyn]

I keep forgeting to bring my tank to the shop. but i got a delivery for the springs. i noticed the red (hardest) maddman spyder spring is softer then my senti's stock. more of a comment then a question. i think this could be my problem though.

[ingenexec]

Well, the spring has to be hard because the sentinel body is shorter, thus giving the hammer less time to develop momentum. Just call ernest :-P

[akaAssasyn]

I understand that the spring has to be harder for the senti. not only because of the body, but the light hammer. its just that i've filed the pin so that more air pushes the hammer and its still needs 500+psi to recock, there isn't much else for me to change other then the springs. trial and error i guess. or some magic cocker gnomes.

[ingenexec]

do me a favor and check how long your adjustment screw is? If its too long it can mess with your adjustments. Either take out and measure, or let your hammer rest forward and adjust the screw out until the bolt pin touches the end of the slot its supposed to move in, and tell me if there's any of the screw sticking out the front. Thats all I can think of that would cause it still...

[hopelessandsic]

mmm i hope ur using paint.... because lp hates dry firing.

[akaAssasyn]

no magic gnomes? the adj. screw does stick out, but thats how i leave it. i removed the adj. screw and put the spring guide (with the oring placed like your pic) all the way in. then i turn the adj. screw in until it touches the spring guide.

i dry fire with the only the back barrel of my two piece and i place my glove and hand to block the barrel.

AM-Andy in a tread mentions a lighter drive spring.
http://www.pbnation.com/showthread.php?s=&threadid=503355
so using the maddman springs may not be a bad idea. so i'll play around with things and see how it goes.

thanks for all the help

[hopelessandsic]

try using paint. I know if i have my torpedo set at 550 it doesn't want to recock w/o paint. So try paint w/ it. Should work. If not, the worst that could happen is u chop a ball, resulting in u taking one minute out of ur time to clean it. So yeah.

[akaAssasyn]

Moving the oring to the side closer to the screw causes leaking so I moved it back. Shooting with paint helped.

Reading up more on LP else where I did learn that its more the valve spring that needs adjusting to improve LP firing. I kept the stock drive spring as its tighter then the maddman's red spring. I clipped the valve spring a bit and that worked well.

Still not what I expected, but its good enough. No more tinkering. Well for now at least.

[AM_Andy]

Wow, you guys are dedicated! I was happy when I got my Sentinel down below 400psi. I'm curious to see what you guys end up with!

[hopelessandsic]

andy, does your sentinel recock w/o paint at that low?

[AM_Andy]

I had problems with it at first, but I think that we put in the lighter drive spring to let it recock. Also, a diadem volume chamber might help.

[hopelessandsic]

... ah... i see....

[akaAssasyn]

Whats the lowest people have gotten for the LP pin to dry fire? I don't want my senti to go insane during a game if the ball don't drop right.

[nbregin]

I've had mine working at 290 psi dryfiring. I had it down to around 270 with paint. I used the Low Pressure Chamber, LP pin, and different drive spring. I would not recommend cutting up springs unless you have extra ones. BTW, I now run at 350, it seems to be more consistant at slightly higher pressure. When you run pressures that low, velocity is more relient on the time that valve is open, which is harder to control than pressure on a blow-back marker. The best consistancy is going to be at 350+.

[akaAssasyn]

nbregin I'll take you advise an not cut my stock drive spring, unlike my valve spring. I'll give my maddman red spring a try, but I think they are too soft for the senti. Well if it don't work I'll deal with 400ish psi.

I don't plan on using the diadem chamber, because I like the extra consistency of the stock volume reg.

Thanks

[akaAssasyn]

Update.

With the way I got my valve it looks like a maddman blue will work the best. Looks like I was wrong about the red spring. Too bad I'm out of air from all the gun farting. I'll have to fine tune things later.

Thanks everyone for your help.