E-Mag runaway in Mechanical Mode

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08-24-2013, 11:37 AM
boonie282

E-Mag runaway in Mechanical Mode

Hello all,

I have just recently upgraded my AGD RT ULE Custom with E-MAG lowers.

Last year I was running the RT ULE custom with a ULE trigger pull kit tuned and installed by AGD being fed by a Ninja PRO SHP 1100 psi tank. Needless to say the gun was tuned almost perfectly super reactive (over 20 bps) but not so reactive that the trigger would runaway.

Fast forward almost a year, I decided to upgrade my RT ULE custom with a set of EMAG lowers. In addition to the lowers I also purchased and installed an EMAG on/off assembly complete with quad o-ring and 0.712 pin. Now after having installed the lowers and new on/off assembly the marker goes runaway in mechanical mode when using the Ninja PRO SHP 1100 psi tank; however, in E-mode she shoots fine. I am just curious if anyone has had the same problems with a similar set up?

After doing a little research, I have come to speculate that the primary cause of the problem is the shorter (0.712) on/off pin. Please correct me if I'm wrong but I have read that the shorter on/off pins are super reactive and I am assuming that this is what is causing my marker to go runaway but I would like to confirm this with someone who is more experienced.

So I'm considering two solutions, either change to a longer on/off pin (even though the recommended pin is the 0.712 for EMAGS) or remove shims from the Ninja PRO SHP 1100 psi tank in order to drop the output pressure of the tank to its lowest setting of 950 psi hopefully dropping the reactivity of the trigger more so it no longer goes runaway.

Has anyone else had problems with their EMAG going runaway while in Mech mode with a Ninja PRO SHP 1100 psi tank?

Please let me know.

Best Regards
-Fred
08-24-2013, 01:12 PM
Justus

Kinda. Mine wasn't runaway, but 20.5 bps with my SHP set to 1100 psi. That was more than I wanted, so I set the SHP to 950 and got a good result.

I'd recommend against going with the longer pin, and instead just cut your input pressure a bit and see if that doesn't help things out.
08-24-2013, 08:40 PM
boonie282

Okay, so I removed 3 shims from the Ninja SHP and lowered to pressure to 950 psi; however, the marker is still going runaway. As soon as I pull the trigger she goes full auto and doesn't stop until the bolt gets stuck or I remove the air source and she's also doing it in E-Mode as well.
08-24-2013, 09:49 PM
Dayspring

The pin you use SHOULD be based on the rail you're using, not the lowers.

Put the shims back in the reg and switch back to the longer pin. (.750 I believe)
08-25-2013, 06:45 AM
El Zilcho

I had something similar happen to me when I did not install the quad o-ring. It seems obvious but just confirm that your quad o-ring installed correctly.
08-25-2013, 06:47 AM
boonie282

Guys I found out what the problem was it was a bad o-ring in the on/off. I took it apart again last night and I examined the on/off o-rings again and noticed that one of them had a little damage on it. I swapped it out and the gun started cycling properly. Specifically it was Item#23 in the following exploded view:

https://www.automags.org/forums/showt...xploded-(Here)

Also, the lowers that I'm using came with an EMAG rail.

Best Regards
-Fred
08-25-2013, 06:52 AM
El Zilcho

Quote:

Originally Posted by El Zilcho

I had something similar happen to me when I did not install the quad o-ring. It seems obvious but just confirm that your quad o-ring installed correctly.

You're welcome ;)
08-25-2013, 03:08 PM
OPBN

Quote:

Originally Posted by Dayspring

The pin you use SHOULD be based on the rail you're using, not the lowers.

Put the shims back in the reg and switch back to the longer pin. (.750 I believe)

.750 is for an Retro/X/Classic RT, or if you are using an Emag valve in a mech setup. .712 is typically whats used for Emag set ups. : https://www.automags.org/forums/showt...tomag-Level-10