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Old 10-21-2012, 05:34 PM #1
tyronejk
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360 QEV not passing air at low pressures

I have an Ion with a 360 qev and at low pressures (~60 psi) or when i first air it up the bolt sticks forward and doesn't move back until i fire once.

I check all the hoses and orings and they're all good. The solenoid seals well too and I'm using a Duracell.

I tried testing all the microline connections by blowing through them and they all work well, but the qev doesn't let air through when i try blowing through it. I'm assuming that the valve will only let air through at a higher pressure (~100+ or so) which must be why my bolt sticks forward when i first air it up.

This is a new qev, so does it need time to break in and loosen up? I didn't have this problem with the standard banjo. Anyone else have this problem?
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Old 10-21-2012, 09:42 PM #2
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Have you adjusted your dwell to compensate for the quicker flow rate?

Also, what bolt do you have?
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Old 10-21-2012, 09:46 PM #3
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Originally Posted by theblindchicken View Post
Have you adjusted your dwell to compensate for the quicker flow rate?

Also, what bolt do you have?
I have adjusted the dwell. And i have both stock and warrior v2 bolts.

The issue isn't with the dwell. The bolt sticks forward as soon as i air it up because the qev doesn't pass air at low pressures.
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Old 10-22-2012, 01:55 PM #4
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Why would it be set to such low psi? Ions can't run at 60 psi without some extremely modded setup. If you're turning the reg down before airing up each time, you don't really need to do that, or you don't need to turn it down below 100 psi ever.

But you might be right, the 360 probably doesn't give a crap about psi below 100.
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Old 10-23-2012, 10:33 PM #5
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Why would it be set to such low psi? Ions can't run at 60 psi without some extremely modded setup. If you're turning the reg down before airing up each time, you don't really need to do that, or you don't need to turn it down below 100 psi ever.

But you might be right, the 360 probably doesn't give a crap about psi below 100.
Yeah, but I'm guessing (after weeks of tinkering) the bolt is sticking forward when I first air it up because when I first air it up the pressure in the gun is way less than the normal operating pressure. And no, I don't turn my reg down before airing it up .

Have you ever had this problem with a QEV and stock bolt?
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Old 10-24-2012, 11:58 AM #6
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I never have.

When's the last time the reg was serviced?
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Old 10-24-2012, 01:13 PM #7
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Quote:
Originally Posted by nerdcore View Post
Why would it be set to such low psi? Ions can't run at 60 psi without some extremely modded setup. If you're turning the reg down before airing up each time, you don't really need to do that, or you don't need to turn it down below 100 psi ever.

But you might be right, the 360 probably doesn't give a crap about psi below 100.
Unless you are running a TechT bolt and VERY high flow reg,volumizer spacer in the firing tube and QEV opereting pressure will be 150psi +/- 20psi,at lower pressure the bolt wont be "sucked" back into firing position.dwell wont matter untill you change the bolt to a lighter than stock and QEV
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Old 10-24-2012, 03:36 PM #8
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I never have.

When's the last time the reg was serviced?
Just before I tested it.
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Old 10-24-2012, 06:53 PM #9
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Mine leaks until the pressure is high enough to cock it back; I like to set my other guns at low psi to dry fire as it uses less air and its quieter, i believe its called diddlefarting around
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Old 10-31-2012, 02:49 PM #10
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The specs for the clippard qev state
Valve opens at 50 psig
5 scfm @ 50 psig
9 scfm @ 100 psig

At 60 psi, the valve is barely open and at about half it's flow rate. Therefore the pressure on the sail can not counteract the full pressure in the firing can and your bolt is stuck forward.

I assume the specs on the 360 qev are similar.
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